Gorman-Rupp Pumps PA6C60C-B-E50 460/3 1528569 and up - Manual (Page 26)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO
START, OVERLOAD
UNIT NOT TRIPPED
(MANUAL MODE)
OVERLOAD UNIT
TRIPS
PA SERIES OM-06531
TROUBLESHOOTING PAGE D - 3
Pump Troubleshooting (Cont'd)
TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
BEARINGS RUN
TOO HOT Bearing temperature is high, but
within limits.
Align drive properly. Drive misaligned.
Check piping installation for proper
support. Suction and discharge lines not prop­
erly supported.
Check for proper type and level of
lubricant. Low or incorrect lubricant.
Check bearing temperature regu­
larly to monitor any increase.
Check belt tension. Adjust as
required. Excessive tension on drive belt.
Control Box Troubleshooting
Power source incompatible with control Correct power source.
box.
No voltage at line side of circuit beaker. Check power source for blown fuse,
open overload unit, broken lead, or
loose connection.
No voltage at line terminals on bottom Check power source for blown fuse,
of overload unit in control box. open disconnect, broken wire, or
loose connection.
Low or high voltage, or excessive volt‐ Measure voltage at control box.
age drop between pump and control Check that wiring is correct type, size,
box. and length. (See Field Wiring
Connections,Section B).
Power input phases not If imbalance exceeds 1 percent,
balanced. notify power company
Control box not compatible with pump. Electrical data on control box and
pump name plate must agree. Re‐
place control box if not in agreement.
Foreign object locking impeller or Remove foreign material or replace
bearing frozen. damaged bearing. If bearing is
damaged, check for water in motor
housing.
Motor windings short‐circuited. Check motor windings with
ohmmeter.