Flowserve KW941 - Manual (Page 19)

KW941 Pump Power Monitor USER INSTRUCTIONS ENGLISH 71569285 02-12
Page 19 of 24 flowserve.com
FAULT SYMPTOM
Unit will not power up (i.e., no lights)
⇓ ⇓ ⇓ ⇓ Display locks up or all LEDs continuously flashing
⇓ ⇓ ⇓ ⇓ Power readings higher than expected
⇓ ⇓ ⇓ ⇓ Power readings lower than expected
⇓ ⇓ ⇓ ⇓ Power readings drifting or inconsistent
⇓ ⇓ ⇓ ⇓ Non-zero reading when equipment not running
⇓ ⇓ ⇓ ⇓ Power reading flashing
⇓ ⇓ ⇓ ⇓ Unit repeats startup/reset cycle when motor is tripped due to alarm, or when the motor is started
⇓ ⇓ ⇓ ⇓ Monitor will not shut off motor
⇓ ⇓ ⇓ ⇓ Cannot start motor
⇓ ⇓ ⇓ ⇓
PROBABLE CAUSES POSSIBLE REMEDIES
Incorrect voltage sample. Verify voltage sample taken from two phases supplying a three-
phase motor.
Poor or open connection from current
sensing toroid leads to terminals # 14
and # 15. Check connections.
Current input circuit damaged because
of overload from selecting the wrong Full
Scale Range (X10 instead of X1) or
having too many turns through the toroid.
Return unit through the sales representative to supplier for
evaluation and repair.
Wrong input voltage frequency setting. Verify correct frequency is selected (50 Hz or 60 Hz) per
jumper Jp3.
Wrong current sensing toroid used with
unit. Verify that the sensor being used is the same one shipped with
the unit. If it is not, see section 5.5 for the calibration
procedure.
Other load exists on terminal # 14 and #
15 or on the leads of the toroid.
Eliminate all connection except those for the KW941.
Over-range condition. 1. Verify equipment operating conditions are at designed levels.
2. Verify correct installation/setup (see “power readings higher
or lower than expected”).
Electrical interference caused by KW941
relay contacts switching too large or
unsuppressed load. 1. Verify load is within relay ratings.
2. Add arc suppression device to motor starting coil.
3. Use interposing relay (a separate relay switched by the
KW941 relay) to switch load. See schematic in Figure 8.2.
Nearby equipment causing interference. Relocate the KW941 unit.
Improper application of remote reset. Use normally open switch/contact for remote reset.
Interference picked up by reset leads. 1. Relocate the leads.
2. Use twisted shielded pair for reset leads.
Incorrect alarm inputs. Check equipment performance characteristics to determine
appropriate set points.
Alarm contact not wired, or improperly
wired into motor start/stop circuit. Verify proper wiring of alarm contacts into motor start/stop
circuit.
KW941 not powered. Check voltage supply to unit.
KW941 tripped due to previous alarm
condition. Check equipment for cause of alarm. Reset unit using manual,
remote, or auto reset features.
Internal fault not allowing contacts to
close. Reset unit (power off/on) to clear the fault. If normal operation
is not seen, return the unit through the sales representative to
supplier for evaluation and repair.
Alarm contacts wired improperly into
motor start/stop circuit. Verify proper wiring of alarm contacts into motor start/stop
circuit.