Bell & Gossett MK MV (8202, 8202X) - Manual (Page 42)

Troubleshooting
Introduction
Follow these guidelines when troubleshooting the pump:
• Disconnect and lock out the power supply except when conducting checks that
require voltage.
• Make sure that no one is near the pump when the power supply is reconnected.
• When troubleshooting electrical equipment, use the following:
• Universal instrument multimeter
• Test lamp (continuity tester)
• Wiring diagram
The pump does not start
WARNING:
Always disconnect and lock out power before servicing to prevent unexpected startup.
Failure to do so could result in death or serious injury.
NOTICE:
Do NOT override the motor protection repeatedly if it has tripped. Doing so may result in
equipment damage.
Cause Remedy
An alarm signal has been triggered
on the control panel.
Check that:
• The impeller rotates freely.
• The sensor indicators do not indicate an alarm.
• The overload protection is not tripped.
If the problem still persists:
Contact the local sales and service representative.
The pump does not start
automatically, but can be started
manually.
Check that:
• The start level regulator is functioning. Clean or replace if necessary.
• All connections are intact.
• The relay and contactor coils are intact.
• The control switch (Man/Auto) makes contact in both positions.
Check the control circuit and functions.
The installation is not receiving
voltage.
Check that:
• The main power switch is on.
• There is control voltage to the start equipment.
• The fuses are intact.
• There is voltage in all phases of the supply line.
• All fuses have power and that they are securely fastened to the fuse
holders.
• The overload protection is not tripped.
• The motor cable is not damaged.
The impeller is stuck. Clean:
Troubleshooting
40 MK, MV (8202, 8202X) Installation, Operation, and Maintenance Manual