压力开关KP系列

DKACT.PD.P10.F1.02 520B0370 June 2000 Data sheet ����������� ���� �� � ������ � � ���������� ��� 2 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP ISO 9001 quality approval Danfoss A/S is certificated by BSI in accordance with international standard ISO 9001. This means that Danfoss fulfils the international standard in respect of product development, design, production and sale. BSI exercises continuous inspection to ensure that Danfoss observes the requirements of the standard and that Danfoss’ own quality assu- rance system is maintained at the required level. Contents Pressure controls KP 35, KP 36, KPI 35, KPI 36 and KPI 38 Introduction ................................................................................................................... page 3 Features ........................................................................................................................ page 3 Definitions ..................................................................................................................... page 3 Ordering ........................................................................................................................ page 4 Technical data ............................................................................................................... page 5 Setting ........................................................................................................................... page 6 Gold contacts ................................................................................................................ page 6 Design and function ...................................................................................................... page 7 KP features ................................................................................................................... page 7 KPI features .................................................................................................................. page 7 Dimensions and weights .............................................................................................. page 8 Accessories for KP/KPI pressure controls ................................................................... page 8 Dual pressure control KP 44 Introduction ................................................................................................................... page 9 Features ........................................................................................................................ page 9 Definitions ..................................................................................................................... page 9 Ordering ........................................................................................................................ page 10 Technical data ............................................................................................................... page 10 Design and function ...................................................................................................... page 11 Pressure setting ............................................................................................................ page 12 Dimensions and weight ................................................................................................ page 12 Accessories for KP 44 pressure controls ..................................................................... page 12 Thermostats KP 75, KP 78, KP 79 and KP 81 Introduction ................................................................................................................... page 13 Features ........................................................................................................................ page 13 Definitions ..................................................................................................................... page 13 Ordering ........................................................................................................................ page 14 Technical data ............................................................................................................... page 14 Design and function ...................................................................................................... page 15 Setting ........................................................................................................................... page 15 Charges ........................................................................................................................ page 16 Gold contacts ................................................................................................................ page 16 Dimensions and weight ................................................................................................ page 17 Accessories for KP thermostats ................................................................................... page 18 Grade of enclosure IP 33/44 enclosure ........................................................................................................ page 19 IP testing ....................................................................................................................... page 19 DKACT.PD.P10.F1.02 3� Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Danfoss KP/KPI pressure controls are used for regulating, monitoring and alarm systems in industry. KP pressure controls are for gaseous media and air. KPI pressure controls are suitable for plant in connection with liquid and gaseous media. Introduction The pressure controls are fitted with a single- pole switch changeover (SPDT). The position of the switch depends on the setting of the pressure control and the pressure in the connector. Features � Wide regulating range � Can be used for pumps and compressors � Small dimensions. Space-saving – easy to install in panels � Shock and impact resistant � Ultra-short bounce times. Limits wear to an absolute minimum and increases reliability � Electrical connection from front of unit. Makes rack mounting easier and also saves space � Suitable for both alternating current and direct current � Cable entry for 6-14 mm diameter cables � Screwed cable entry makes rewiring easy. Standard screwed cable entry Pg 13.5 and Pg 16 Definitions Range setting The pressure range within which the unit will give a signal (contact changeover). Differential The difference between contact changeover on rising and falling pressure. The differential is a condition for stable automatic plant operation. Automatic reset Units with automatic reset restart automati- cally after stop. Min. reset units will restart after the pressure has risen by a value greater than that of the fixed differential. Max. reset units will restart after the pressure has fallen by a value greater than that of the fixed differential Permissible operating pressure The highest permissible constant pressure or pressure variation the unit can be exposed to. KP/KPI illustrated is KPI 35 with top cover 4 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Setting Permissible range Differential operating Max. test Pressure Contact Code no. Type p e pressure pB pressure connection Material[bar] [bar] [bar] [bar] –0.2 � 7.5 0.7 � 4 17 22 G 1/4 A Ag 060-1133 KP 35 Au 060-5047 2 � 14 0.7 � 4 17 22 G 1/4 A Ag 060-1108 KP 36 Au 060-1137 4 � 12 0.5 � 1.6 17 22 G 1/4 A Ag 060-1221 KP 36 Au 060-1144 Pressure controls type KP 35 and 36Ordering, IP 33/44 versions Setting Permissible range Differential operating Max. test Pressure Contact Code no. Type p e pressure pB pressure connection Material[bar] [bar] [bar] [bar] –0.2 � 8 0.4 � 1.5 18 18 G 1/4 A Ag 060-1217 KPI 35 Au 060-3164 –0.2 � 8 0.5 � 2 18 18 G 1/4 A Ag 060-1219 KPI 35 Au 060-3165 4 � 12 0.5 � 1.6 18 18 G 1/4 A Ag 060-1189 KPI 36 Au 060-1138 2 � 12 0.5 � 1.6 18 18 G 1/4 A Ag 060-3169 KPI 36 Au 060-3166 8 � 28 1.8 � 6 30 30 G 1/4 A Ag 060-5081 KPI 38 Au 060-3167 Pressure controls type KPI 35 - 38Ordering, IP 33/44 versions DKACT.PD.P10.F1.02 5� Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Technical data Description KP KPI Ambient temperature °C –40 °C - +65 °C (for short periods up to +80 °C) Media temperature °C –40 °C - +100 °C Media Gaseous media and air Air, oil, fresh water Parts in contact Bellows Tinbronze W. no. 2.1020 to DIN 17662 Tinbronze W. no. 2.1020 to DIN 17662 with medium Pressure connector Free-cutting steel W. no. 1.0719 to DIN 1651 Brass W. no. 2.0401 to DIN 17660 Contact system Single-pole changeover switch (SPDT) Alternating current: Alternating current: AC-1: 16 A, 400 V AC-1: 10 A, 440 V Contact load, Ag contact set AC-3: 16 A, 400 V AC-3: 6 A, 440 V AC-15: 10 A, 400V AC-15: 4 A, 440V Contact material AgCdO Direct current: Direct current: DC-13: 12 W, 220 V DC-13: 12 W, 220 V Contact load, Au contact set See information page 6 Enclosure, IP 33 grade Unit must be mounted on a flat surface/a flat fitting and all unused holes covered. Enclosure, IP 44 grade Mounted as IP 33 plus fitting of top cover, code no. 060-1097 Cable connection Entry for 6-14 mm diameter cables Mounted on back plate/wall bracket Vibration proof in the range 0 - 1000 Hz, 4 g (1 g = 9.81 m/s2) Mounted on angle bracket Not recommended in areas where vibrations occur Approvals EN 60 947-4,5 EN 60 947-4,5 RINA, Registro Italiano Navale MRS, Maritime Reg. of Shipping, Russia UL approved versions are available 6 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Setting scale. Then set the lower limit pressure on the DIFF scale (the upper limit minus the differential). KP/KPI pressure controls with automatic reset: Set the upper limit pressure on the range Gold contacts Curve A gives the maximum load. Hatched area B: Acceptable load for the gold plating of the contact. Contact load Alternating current: Ohmic load: AC-1: 10 A, 440 V Inductive load: AC-3: 6 A, 440 V AC-15: 4 A, 440 V Direct current: DC-1312 W, 220 V, Contact system Single-pole changeover switch (SPDT) Contact material: Gold-plated silver Diff. Range DKACT.PD.P10.F1.02 7� Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Design and function 1. Setting spindle 2. Differential setting spindle 3. Main arm 4. Main spring 5. Differential spring 6. Bellows 7. Connector 8. Contact system 9. Connection terminals 10. Earth terminal 11. Cable entry 12. Omega spring (KPI) 12. Tumbler (KP) 13. Locking screw (KPI) 13. Locking plate (KP) � High contact load � Ultra-short bounce times � Vibration-proof in the range 0-1000 Hz, 4 g (1 g = 9.81 m/s2) � Long operating life � Can be used for both liquids and gases � Small dimensions – Easy to mount in panels Danfoss KPI pressure controls are designed so that the bellows moves in the same proportion as the pressure change. To ensure a snap function on contact change- over, an omega spring is located between bellows and contact system. The design of KPI pressure controls gives the following advantages: KPI features The contact system in KP pressure controls has a snap function. This means that the bellows is active only when the cut-in or cut-out value is reached. The bellows is connected to the pressure of the controlled plant via the connector (7). The design of KP pressure controls gives the following advantages: � High contact load � Ultra-short bounce times � Vibration-proof in the range 0-1000 Hz, 4 g (1 g = 9.81 m/s2) � Long operating life � High pulsation protection � Small dimensions – Easy to mount in panels KP features Drawing showing principle of KP pressure controls Drawing showing principle of KPI pressure controls 8 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Accessories for KP/KPI pressure controls Part Symbol Description Total Code no. Wall bracket 10 060-1055 Brackets with mounting screws Angle bracket 10 060-1056 and washers 4-off screws M4�5 + 4-off washers 1 060-1054 Screwed cable entry Screwed Pg 13.5 with special nut. cable entry For 6-14 mm cables. 5 060-1059 A standard Pg 16 screwed cable entry can be used for 8-16 mm cables. Sealing screw For sealing the setting on KP 20 060-1057 If a bracket is mounted on the backplate of the housing, the KP/KPI pressure control will 10 060-1097Top cover have an IP 44 grade of enclosure. The cover covers the setting spindles. Protective cap for KP/KPI pressure controls. To protect the unit against rain and humidity. Protective cap Grade of enclosure: IP 44 7 060-0031 Material: Polyethylene Max. ambient temperature: 65 °C Min. ambient temperature: –40 °C Dimensions and weights Pressure controls KP 35, KP 36, KPI 35, KPI 36 and KPI 38: Weight approx. 0.3 kg 14 DKACT.PD.P10.F1.02 9� Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Introduction Danfoss dual pressure switch KP 44 is designed for use as a pump guard to control and protect supply water pumps. The KP 44 pump guard combines the function of a pressure switch and a flow monitoring device. The lefthand pressure bellows controls the pump pressure. The righthand bellows cuts out the pump if the pump suction pressure is too low. In this way the pump is protected from running dry and consequent bearing damage. Features � Wide regulating range � Can be used for pumps and compressors � Small dimensions. Space-saving – easy to install in panels � Ultra-short bounce times. Limits wear to an absolute minimum and increases reliability � Electrical connection from front of unit. Makes rack mounting easier and also saves space � Suitable for both alternating current and direct current � Cable entry for 6-14 mm diameter cables � Screwed cable entry makes rewiring easy. Standard screwed cable entry Pg 13.5 and Pg 16 � Efficient protection of water pumps in case of water supply fails. Definitions Range setting The pressure range within which the unit will give a signal (contact changeover). Differential The difference between contact changeover on rising and falling pressure. The differential is a condition for stable automatic plant operation. Automatic reset Units with automatic reset restart automatically after stop. Min. reset units will restart after the pressure has risen by a value greater than that of the fixed differential. Max. reset units will restart after the pressure has fallen by a value greater than that of the fixed differential Permissible operating pressure The highest permissible constant pressure or pressure variation the unit can be exposed to. KP 44 10 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Ambient temperature °C –40 °C - +65 °C (for short periods up to +80 °C) Media temperature °C Max +100 °C Media Fresh water Parts in contact Bellows Tinbronze W. no. 2.1020 to DIN 17662 with medium Pressure connector Free-cutting steel W. no. 1.0719 to DIN 1651 Contact material AgCdO Alternating current: AC-1: 16 A, 400 V AC-3: 16 A, 400 V AC-15: 10 A, 400V Contact load, Ag contact set Direct current: DC-13: 12 W, 220 V Approvals EN 60 947-4,-5 Cable connection Entry for 6-14 mm diameter cables Mounted on backplate Vibration-proof in the range 0 - 1000 Hz, 4 g (1 g = 9.81 m/s2) or wall bracket Mounting on angle bracket Not recommended for areas where vibration occurs Technical data Pressure range Differential Permissible Max. test Pressure Contact Code no. Control Safety Control Safety operating pressure connection Materialpressure pB [bar] [bar] [bar] [bar] [bar] [bar] 2 - 12 0.5 - 6 0.7 - 4.0 1.0 LP/HP: 17 22 2 � G 1/4 A Ag 060-0013 Pressure control type KP 44, IP 22Ordering DKACT.PD.P10.F1.02 11� Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP Design and function Water supply from reservoir or well If water is running short in the well or reser- voir, the pump will no longer be able to increase the pressure to the cut-out value. Consequently the pump will keep running - perhaps without water. However, the KP 44 pump guard will stop the pump as soon as the righthand bellows pressure drops below the safety cut-out setting. The pump can be started again by lifting the impulse lever. The pump will continue to operate when the impulse lever is released, provided that the righthand bellows pressure is higher than the safety cut-out setting plus a fixed differential of 1 bar. If this is not the case, the pump will cut-out again indicating insufficient water supply. Pressurized water supply direct to pump When water supply fails on the inlet side, the pump will no longer be able to boost the pres- sure to the cut-out value. Consequently the pump will keep running - perhaps without water. However, the KP 44 pump guard will stop the pump as soon as the pressure in the pump suction line drops below the safety cut-out setting. The pump will automatically start again when the pump suction pressure has reached the level of 1 bar above the safety cut-out setting. Automatic start-up will only take place if the righthand bellows is connected to the pump suction line. Air pockets should be avoided to prevent the pump from starting up on air pressure rise, without the presence of water. In a hydrophore system where water is pumped from a well or an open tank, both bellows are connected to a pressure outlet on the air side in the pump pressure line, if possible. In a booster system receiving pressurized water the righthand bellows is connected - to the low pressure side of the pump for automatic start-up. - to the high pressure side of the pump for manual start-up. The lefthand bellows is always connected to the high pressure side of the pump. 1. Lefthand pressure setting spindle 2. Differential setting spindle 3. Main arm 4. Righthand pressure setting spindle 5. Main spring 6. Differential spring 7. Bellows 8. Pressure connections 9. Switch 10. Terminal 11. Earth terminal 12. Cable entry 13. Tumbler 14. Locking plate 15. Impulse lever The switch in the KP has a snap-action function, and the bellows moves only when the cut-in or cut-out value is reached. 12 DKACT.PD.P10.F1.02 � Danfoss A/S 06-2000 Data sheet Pressure controls and thermostats, types KPI and KP The safety cut-out setpoint is normally determined by the static pressure (the water column). However, in order to avoid disturbing signal interaction, care should be taken to ensure that the safety cut-out setting is at least 1.5 bar lower than the control pressure cut-in setting. See table with pressure setting examples below. Pressure settings Safety cut-out setting The righthand bellows will automatically cut-out the pump at the safety cut-out setpoint. Automatic start-up, if any, will take place when the pressure has reached the level of 1 bar above the setpoint. Manual cut-in is made by lifting the impulse lever and releasing it again when the pressure has increased by min. 1 bar. Required tap water pressure � 2.3 bar � 4.0 bar � 5.0 bar � 8.0 bar Control pressure cut-out setting 3.0 bar 5.0 bar 8.0 bar 12 bar Differential 0.7 bar 1.0 bar 3.0 bar 4.0 bar Control pressure cut-in setting 2.3 bar 4.0 bar 5.0 bar 8.0 bar Max. safety cut-out setting 0.8 bar 2.5 bar 3.5 bar 6.0* bar * 6.0 bar is the normal max. setpoint Control pressure settings Control pressure cut-out setpoint is set on the lefthand pressure setting scale. The differen- tial is set between 0.7 and 4 bar. The control pressure cut-in setting will be the cut-out control pressure less the differential. Dimensions and weight Weight approximately 0.5 kg Accessories for KP 44 pressure controls Part Symbol Description