EXE RISE D8 - Clutch and Grear Box Maintenance; Adjustment; Troubleshooting

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7.3 CLUTCH AND GREAR BOX MAINTENANCE / ADJUSTMENT
Any intervention on the clutch is prohibited. Only RWM authorised service engineers are allowed to carry out
maintenance work on clutches.
Do not use any kind of fluid or spray which causes a lubrication effect on the clutch friction disk. For cleaning
use a resolving agent suitable for the application.
7.4 TROUBLESHOOTING
TROUBLE
PROBABLE CAUSE
CHECK AND REMEDY
1) Hoist does
not respond to
the controller
or control
device
a) No voltage at hoist main line or control circuit
switch open; control line fuse blown or circuit
breaker tripped.
a) Close switch, replace fuse blown.
b) Phase failure – power cable damaged; power
supply cable damaged; broken stator winding.
b) Check for electrical continuity and
repair or replace defective part.
c) Open control circuit – primary transformer fuse
blown; broken transformer winding; broken
up/down limit switch; up/down contactor coil
broken; loose connection or broken wire inside the
circuit; contactor jammed.
c) Check electrical continuity and
repair or replace defective part.
d) Wrong voltage or frequency.
d) Use the voltage and frequency
indicated on hoist identification plate.
e) Low voltage.
e) Check the power supply voltage.
f) The brake does not open – the brake power
supply coil is open, short-circuited or broken;
circuit breaker blown.
f) See item c).
g) Excessive load.
g) Reduce loading to the capacity limit
of hoist as indicated on the
identification plate.
2) Chain
moves in the
opposite
direction
a) Three-phase power inverted.
a) Refer to installation instruction in
chapter 4.
3) Hook lowers
but will not
raise.
a) Excessive load mechanical load clutch slipping.
a) Refer to installation instruction in
chapter 4.
b) Open hoisting circuit-open or shorted winding in
reversing contactor coil loose connection or
broken wire in circuit; control station contacts not
making; upper limit switch contacts open.
b) Check electrical continuity and
repair or replace defective part.
c) Phase failure.
c) See item 1b
4) Hook raises
but will not
lower.
a) Open control circuit – "down" contactor coil
broken or short-circuited; "down" limit switch
broken.
a) Check electrical continuity and
repair or replace defective part.
5) Hook lowers
when hoisting
control is
operated.
a) Phase failure
a) See item 1B
b) Phase reversal.
b) Refer to installation instruction in
chapter 3.