Troubleshooting; Electrical Troubleshooting; The Pump Does Not Start - Xylem Flygt 2620.172 Service And Repair Instructions

5 Troubleshooting

5.1 Electrical troubleshooting

DANGER: Electrical Hazard
Troubleshooting a live control panel exposes personnel to hazardous voltages. Electrical
troubleshooting must be done by a qualified electrician.
Follow these guidelines when troubleshooting:
• Disconnect and lock out the power supply except when conducting checks that
require voltage.
• Make sure that no one is near the unit when the power supply is reconnected.
• When troubleshooting electrical equipment, use the following:

5.2 The pump does not start

DANGER: Crush Hazard
Moving parts can entangle or crush. 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
An alarm signal has been triggered
on the control panel.
The pump does not start
automatically, but can be started
manually.
2620.172/.281 Service and Repair Instructions
– Universal instrument multimeter
– Test lamp (continuity tester)
– Wiring diagram
Remedy
Check that:
• The impeller rotates freely.
• The sensor indicators do not indicate an alarm.
• The overload protection is not tripped.
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.
5 Troubleshooting
61