PEDROLLO M/M 8.5 Manual De Uso Y Mantenimiento página 44

EXT OFF
Placing out of service by means of external
signal
none Pressure sensor fault
PROBLEM
Pump always running even when not required
Message Cause
None
System leaks greater then 2 l/min
None
Flow sensor fault or locked open
PROBLEM
The pump stops too soon when requested
Message Cause
none
Flow rate sensor fault
Message Cause
Message Cause
none
Air inside suction manifold
none
Pump blocked or damaged
Replacement of the CONTROL BOARD + PRESSURE SENSOR
- Disconnect the inverter main power supply and wait 2 minutes (capacitors discharge)
- Open the front cover and disassembly the pressure sensor and the control board as shown below
- Install the new control board with pressure sensor in reverse order of removal.
Open the front cover by unscrewing the 4 screws
Disconnect the wire communication with the power
board
Re-assemble the new BOARD+SENSOR in the same way but in reverse order:
- FIRST assemble the CONTROL BOARD
Check the external signal
Check the display pressure with a reference manometer, re-
calibrate or substitute the pressure sensor
intervention
Identify the leaks and repair
Inspect and check the flow sensor
intervention
Check the flow rate sensor
intervention
Bleed the suction system
Inspect the pump and eliminate the problem
MAINTENANCE
Before removing the cover, disconnect the
ribbon cable of the display
Remove FIRST the PRESSURE SENSOR and
THEN the CONTROL BOARD by unscrewing the 5
screws indicated
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