Fault Finding - Grundfos Control MPC-Serie Installationsanleitung

9. Servicing the product
9.1 Maintaining the product
WARNING
Electric shock
Death or serious personal injury
- Switch off the power supply before you start any
work on the product.
- Lock the main switch with a padlock to ensure that
the power supply cannot be accidentally switched
on.
9.2 CU 352
CU 352 is maintenance-free. Keep the unit clean and dry, and
protect it against direct sunlight. For ambient temperature, see
section 12. Technical data.

10. Fault finding

WARNING
Electric shock
Death or serious personal injury
- Switch off the power supply for at least five
minutes before you start any work on the product.
- Make sure that the power supply cannot be
accidentally switched on.
Fault
The system has stopped and
cannot restart.
72
Possible cause
The primary sensor is defective.
The cable is broken or short-circuited.
The power supply is disconnected.
CU 352 is defective.
The power supply is disconnected.
The main switch is switched off.
The main switch is defective.
The motor protection is activated.
Remedy
Replace the sensor.
Transmitters with 0-20 mA or 4-20 mA output
signals are monitored by the system.
Repair or replace the cable.
Connect the power supply.
Contact Grundfos.
Connect the power supply.
Switch on the main switch.
Replace the main switch.
Contact Grundfos.