Zanotti un0 010, Workshop Manual

Page: 160 / 248

149
5.3 Digital Sensors
Electronics and wiring
PMX High Pressure Switch
Specifications:
Circuit unipolar
State N.C.
Opens at > 32barg (464psig)
Recloses at < 27barg (392psig)
Connections:
Port-Pin by Wire
J10 − 6th NE106
J8 − 13rd 73
Functions:
Pressure Switch PMX trips when discharge side pressure
rises over > 32barg (464psig) and A04 Alarm occurs
stopping unit, which automatically restart when pressure
decreases below 27barg (392psig).
Digital Input menu label:
High Pressure Switch
Alarm: A11 - High Pressure
P1MX Condenser Fan Switch
Specifications:
Circuit unipolar
State N.O.
Closes at > 22barg (319psig)
Reopens at < 17barg (247psig)
Connections:
Port-Pin by Wire
J11 − 1st
K5 21
Functions:
Pressure switch P1MX trips when condensing side pressure
rises over 22barg (319psig)
activating second condenser fan until pressure rest over
17barg (247psig)
Digital Input menu label: NONE
This sensor directly manages condenser fan without CPU
board interaction.
Alarm: This sensor does not directly trips any alarm, anyway
in case condenser fan which is managed by this switch is
not turning ON when needed, alarm "A11 - High Pressure
alarm" should occur.