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TROUBLESHOOTING
SECTION 7-4
Electrical Faults
PROBLEM
Electrical Faults
PROBABLE CAUSE REMEDY
1. Power supply failure. 1. Check fuses.
2. Starter is inoperative. 2. Check supply mains. Also,
check starter contacts for burning,
replace if necessary.
3. Starter overloads cut out. 3. Check current requirements on
motor nameplate and adjust.
A. Motor fails to start
4. Safety interlock is inoperative. 4. Check and adjust as needed.
1. Too much belt tension. 1. Check belt tension and adjust
as necessary. Refer to section 4.
2. Motor is improperly wired. 2. Check terminal connection
with manufacturers connection
diagram in conduit box and adjust
as necessary.
B. Motor starts, but will not take
load.
3. Defective starter winding. 3. Check current in each phase
with an ammeter. If there is
marked difference in current on
any phase, contact the motor
manufacturer.
C. Motor starts when
disconnected from load, but will
not when connected.
1. Worn bearings. 1. Check and replace if necessary,
in accordance with manufacturers
literature.
D. Jackscrew does not operate
after extended running.
1. Over-temperature cutout is
activated.
1. Allow cooling for 10 minutes,
and then retrying.
E. Hydraulic cylinders or
Jackscrews operate while rotor is
in motion.
1. Zero speed switch is
inoperative.
1. Check zero speed sensor
position.
2. Check zero speed
electrical circuit.
F. Jackscrew motor continues
running after jackscrew reaches
its normal extended or retracted
position.
1. Limit switches not properly
set.
1. Set the limit switches
using the procedure in
section 4.
2. Check the electrical
circuit.
G. Cutting chamber only –
Jackscrew motor continues
running after motion of cutting
chamber stops – Chamber may be
open or closed.
1. Limit switch on mounting
bracket not properly set.
1. Adjust the mounting
bracket switch. Refer to
section 4.
2. Check electrical circuit
I. Hydraulic Pump Motor 1. Limit switches not properly set. 1. Check limit switches using
Continues to run after Chamber procedure in Section 4
or cradle closes. 2. Check the electrical
circuit.