Flowserve Byron Jackson Type M - Manual (Page 58)

® Byron Jackson Double Mechanical Seal Submersible Pumping Unit • 1042.293/9 • June 04
Page 58 of 68
FAULT SYMPTOM
Motor protection triggered
⇓ ⇓ Pump does not start
⇓ ⇓ Flow inadequate
⇓ ⇓ Pumping unit runs, but does not pump
⇓ ⇓ Shut-off head current (amps) is higher than originally recorded but shut-off head is not diminished
⇓ ⇓ Shut-off head is diminished but shut-off current (amps) is unchanged
⇓ ⇓ Shut-off head is diminished and shut-off current (amps) is much higher
⇓ ⇓ Duty capacity and head are low but running current (amps) and shut-off valves are normal
⇓ ⇓ Pump starts bus trips circuit breaker
⇓ ⇓ Pump does not start
⇓ ⇓ PROBABLE CAUSES POSSIBLE REMEDIES
z Blockage in discharge or intake Disassemble and clean discharge and
intake.
z Valve in system is not fully open Fully open valve
C. ELECTRICAL TROUBLES
z Motor circuit breaker adjusted too low. Readjust motor circuit breaker
according to rating plate or Chapter
12.2 "Data sheet".
z Current consumption of motor too high due to
under voltage or wrong frequency.
Check system voltage and frequency.
Check if the information on the type
plate corresponds with the system
voltage and frequency.
z Phase failure. Check fuses.
Examine power cables for damage.
z Voltage failure due to blown fuse(s). Replace fuse(s).
z Defective power cable. Replace power cable.
z Incorrect rotating direction. Change rotating direction.
z Rotating speed too low because of under volt-
age or wrong frequency.
Check system voltage and frequency.
z Rotating speed too low because motor runs
with one phase.
Check fuses.
z Rotating speed too low due to bearing dam-
age.
Remove pumping unit and repair.
z z Drop in line voltage If amperage remains within 110 % of
the rated value: No remedy necessary.
If amerage does not remain within
110 % of the rate value: Check line
voltage
z Insulation failure Measure insulation resistance.
z Insulation failure Measure insulation resistance.
Check voltage.
z Pumping unit is stuck Try momentarily reversing rotation by
interchanging any two leads