Poweramp POWERHOOK SERIES - Manual (Page 39)

TROUBLESHOOTING POWERHOOK
Symptom Possible Cause Solution
Three-phase units only:
Restraint does not
operate. Motor energizes
but does not run.
If motor hums, but does
not run, overload device
should trip.
3 Phase units only - no
voltage is present on one
line.
NOTE: A motor that is
missing voltage on one line
is said to be single-phased.
Check for blown fuses at branch circuit disconnect.
Replace fuse. Determine cause of blown fuse.
Check motor starter as follows:
1. Disconnect wires at load side of starter.
2. Energize the starter.
3. Measure line-to-line voltage at line side of starter.
4. Measure line-to-line voltage at load side of
starter.
5. Line-side and load-side voltages should be
approximately the same. Replace starter if
voltage values are considerably different from
one another.
Check all wiring to motor for high resistance or no
connection.
Replace motor.
Three-phase units only:
Restraint does not
operate. Motor runs in
reverse Phase reversed. Reverse any two legs at the branch circuit
disconnect.
Single-phase units only:
Restraint does not
operate.
Motor energizes, but
does not run.
Line voltage too low. Check wiring to motor for high resistance. Check for
loose or corroded connections. Check wire gauge for
correct size and specification for load requirement.
Replace if necessary.
Defective motor centrifugal
switch. Replace motor.
Defective motor capacitor. Replace motor.
Restraint operates
slowly. Low hydraulic fluid. Add fluid, see Maintenance section for proper fluid
level and type.
Pressure relief valve set too
low. Locate valve on main valve block (labeled RV).
Turn the valve all the way counter-clockwise. While
operating the restraint, slowly turn the valve in
clockwise, until the restraint lowers and begins
to extend. Turn valve in an additional 1.2 turn
clockwise.
NOTE: The pressure relief valve must not be set at a
level that causes the motor operating current
to exceed the full load amp value* at any time,
including when operating in pressure relief.
* The full load amp value can be found on the inside cover of the
control panel.
Damage or blocked
hydraulic hose(s) and/or
valve(s). Replace damaged hose(s). Check and remove
blockage from hose(s) and/or valve(s).
4111-0010 — Nov 2010 37