Poweramp VS VERTICAL SPECIALTY 5.2007 - Manual (Page 15)

Problem Cause(s) Solution(s)
The VS dockleveler does not
operate. Motor energizes but does
not run (motor hums, overload
device should trip). 1. 3 phase units only--voltage at
one line is absent (motor being
single phased).
2. 1 phase units only--motor
centrifugal switch faulty.
1A. Fuses at motor branch circuit
overcurrent device only--check
for tripped fuse. Replace
fuse. Determine cause of
fuse tripping.
1B. Check motor starter for
component failure. Discon-
nect wires at load side of
starter. Use voltmeter to read
line-to-line voltages at line
side and load side of starter.
Line side and load side
voltage values should be
nearly identical. Replace
starter if values are not
identical.
1C. Check all wiring to motor for
high resistance (loose) or no
connection.
2. Replace motor.
1. Add fluid, see Preventative
Maintenance section, page 10.
2. Locate pressure relief valve.
Turn valve 3/4 turn (CW).
Increase the valve set point until
the Railramp operates properly.
NOTE: The valve set point
should NOT be set at a level
that will cause the motor
operating current to exceed its
full load amp value at any time,
including when the unit is
operated in pressure relief.
3. Replace damaged hose(s).
Remove blockage from hose(s).
1. Low hydraulic fluid.
2. Pressure relief valve set too low.
3. Damaged or blocked hydraulic
hose(s).
The VS dockleveler operates slowly.
1. Add fluid. See Preventative
Maintenance section, page 10.
1. Low hydraulic fluid. The VS dockleveler does not fully
raise or motor overcurrent device
and/or overload device continuously
tripping.
14
Troubleshooting Guide