Gorman-Rupp Pumps S4A1-E25 460/3 1396155 and up - Manual (Page 23)

TROUBLE POSSIBLE CAUSE PROBABLE REMEDY
PUMP FAILS TO
START, OVER­
LOAD UNIT NOT
TRIPPED (MANU­
AL MODE). Power source incompatible with con­
trol box. Correct power source.
No voltage at line side of circuit
breaker. Check power source for blown fuse,
open circuit breaker, broken lead or
loose connections.
Open circuit in motor windings or
power cable. Check continuity.
Defective motor power cable. Replace cable.
Defective motor. Check for and replace defective mo­
tor components.
PUMP FAILS TO
START, OVER­
LOAD UNIT NOT
TRIPPED (AUTO­
MATIC MODE). Liquid level device or control circuits
improperly connected to main con­
trol box. Check wiring diagrams: cor­
rect or tighten connections.
Level sensing device(s) improperly
positioned. Position device(s) at proper
level.
Level sensing device(s) fouled with
mud or foreign material. Clean sensing device(s).
Float type sensing device(s) tangled
or obstructed. Check installation for free
movement of float.
Defective liquid level sensing de­
vice(s) or control panel. Repair or replace defective unit(s).
OVERLOAD UNIT
TRIPS Low or high voltage, or excessive
voltage drop between pump and
control box. Measure voltage at control box.
Check that wiring is correct type,
size, and length (see Field Wiring
Connection, Section B).
Defective insulation in motor wind­
ings or power cable; defective wind­
ings. Check insulation resistance; check
continuity.
Impeller jammed due to debris or in­
sufficient clearance. Disassemble pump and check im­
peller.
Bearing(s) frozen. Disassemble pump and check bear­
ing(s).
S SERIES PUMPS OM-06098
PAGE D - 1 TROUBLESHOOTING
TROUBLESHOOTING - SECTION D
Review all SAFETY information in Section A.
NOTE
Many of the probable remedies listed in the TROU­
BLESHOOTING CHART require use of electrical
test instruments; for specific procedures, see
ELECTRICAL TESTING at the end of the chart.
TROUBLESHOOTING CHART