Enerpac PR-Series Electric - Handbuch (Seite 12)

12
Table 10 - Troubleshooting Guide (Continued)
Symptom Possible Cause Solution
6. Cylinder extends but
will not retract.
Internal pressure leaks, or leaking retract
hoses.
Have hydraulic system inspected by Enerpac authorized service center.
Repair or replace components as required.
Internal relief valve setting or retract side
relief valve setting too low.
Have hydraulic system inspected by Enerpac authorized service center.
Repair or replace components as required.
Defective over-center valve, secondary
lock valve or control valve.
Have hydraulic system inspected by Enerpac authorized service center.
Repair or replace components as required.
Pump not developing enough pressure. Have hydraulic system inspected by Enerpac authorized service center.
Repair or replace components as required.
7. Pump does not run. No power or incorrect power. Check AC line power.
Jack circuit breaker tripped.
(single-phase models only)
Depress circuit breaker reset button (on jack electrical enclosure).
Jack motor overload relay tripped.
(three-phase models only)
Depress reset button on motor overload relay (inside jack electrical
enclosure).
Transformer primary or secondary fuse
blown.
Remove both fuses and check them for continuity.
If one or both fuses are blown, check line voltage to be sure it is correct
for your jack model. Verify that the fuses installed are of the correct type
and rating. Refer to Table 9.
Note: A damaged pendant cable can cause the secondary fuse to blow.
If one or both fuses continue to blow after being replaced and the problem
cannot be determined, have the jack electrical system inspected and
repaired by an Enerpac authorized service center.
Motor brushes worn.
(single-phase models only)
Have motor brushes replaced by Enerpac authorized service center.
Loose connections or incorrect wiring. Have electrical system inspected by Enerpac authorized service center.
Motor and/or electrical components worn
or damaged.
Have electrical system inspected by Enerpac authorized service center.
Repair or replace components as required.
8. Pump motor turns in
wrong direction.
(three-phase models
only)
Wiring incorrect. Reverse electrical leads.
9. Pump motor runs hot
or trips circuit breaker.
(single-phase models)
Pump motor runs hot
or trips motor overload
relay. (three-phase
models)
Motor worn or damaged. Have motor inspected by Enerpac authorized service center. Repair or
replace as required.
Motor is “single phasing”.
(three-phase models only)
Correct electrical wiring.
Pump element damaged, worn or seized. Have pump element inspected by Enerpac authorized service center.
Repair or replace as required.
10. Pump motor tries to
start but will not run.
Low voltage. Check AC line voltage.
Pump element jammed. Have pump element inspected by Enerpac authorized service center.
Repair or replace components as required.
Motor and/or electrical components worn
or damaged.
Have electrical system inspected by Enerpac authorized service center.
Repair or replace components as required.
11. Jack is difficult to roll
on wheels.
Low tire inflation pressure. Check tire inflation pressure. Add air if low.
Pressure should be 90 psi [6,2 bar].
Wheel bearings need lubrication. Apply grease to wheel bearings.
Wheel locknut out of adjustment. Loosen locknut until wheel rotates freely.