If the differential is set at a value greater than the stop pressure the plant cannot start. If this is the case, set the differential at a smaller value (towards minus). Figure 4: Stop pressure graph. oss 31E47. Turns of screw. Example: A compressor is to be regulated by a CS pressure switch. The start pressure is 3.5 bar, and the stop
Therefore the settings for cut-out pressure and differential stay constant unless the permissible ambient temperature is exceeded. When system pressure exceeds the set value, the BCP will automatically stop the plant. A rupture in the inner bellows cause the control cut-out pressure to fall about 3 times less then the preset value, thus by setting the neutral zone disc (40) at 2.5. Because the contact dierential is 0.1 bar, the make and break dierential pressures for the switch are: Make dierential pressure for contacts 1 - 4 = 0.5 bar + 0.1 bar = 0.6 bar. Break dierential pressure for contacts 1 - 4 = 0.5 bar (= set value p). 1 - 2 = 0.6 bar - 0.25 bar = 0.35 bar. Pressure switch KP 15, KP 17W, KP 17B, KP 25 060R9747 060R9747 © Danfoss | DCS (jmn) | 2016.10 DKRCC.PI.CA0.B3.22 | 520H11520 | 1 t 1 min.: -40 °F (-40 °C)-13 °F (- 25 °C) (PED approved products) t 1 max.: 149 °F (65 °C) Ambient temperatures / Mounting requirements KP 15 man. (LP) / man. (HP) reset KP 15, KP 17B auto. (LP) / man. (HP) reset
2 VLT is a registered Danfoss trademark Equipment Hazard! Rotating shafts and electrical equipment can be hazardous. It is strongly recommended that all electrical work conform to the National Electrical Code (NEC) and all local regulations. Installation, start-up and maintenance should be performed only by qualified personnel.
Service and Parts Manual PVG 16/32/128/256 Installation PVG 16 pressure setting, PVP/PVB PVG 16 pressure setting (LS connection) LS B Relief valve adjustment 4 [0.16] 360° ≈ 120bar [1740 psi] The table below determines which availability of relief valve based on date of PVP/PVB purchase.
Features Ambient temperature Maximum working pressure Maximum test pressure Switch Contact load Terminal D, dual switches Values -40 - 149 °F (175 °F for maximum 2 hours) LP: MWP = 245 psig HP: MWP = 465 psig LP: pe = 285 psig HP: p = 510 psig e Single pole changeover switch (SPDT) 120 V AC: 16 FLA, 96 LRA 240 V AC: 8 FLA, 48 LRA
The range value of the pressure switch must be set at 10 bar, the differential at 1 bar. The bell must be connected to terminals 1 and 4. Example 3 The pressure in a start air reservoir must be regulated with a compressor controlled by a KPS pressure switch so that it lies between 30 and 36 bar. Choose a KPS 45 (range 4 - 40 bar). The set differential pressure can be read from the internal scale. The MP 54 has a fixed differential and has no pressure setting disc. The factory-set differential pressure is stamped on the front plate of the switch. Table 1: Materials in contact with the medium Unit type Material MP 54 MP 55 Stainless steel 19/11, no. 1.4306 to EN 10088 .
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