Electrical faults
Description of fault
Cause
Remedy
Personnel
Drive unit does not rotate Faulty or missing contact
to power supply
Check the power supply
connector
Electrical technician,
ATEX electrical techni‐
cian
Drive motor rotates in the
wrong direction
The phases have been
swapped
Swap the phases
Electrical technician,
ATEX electrical techni‐
cian
Various sensors do not
react
Incorrect installation,
faulty contacts, faulty
sensor
Correct installation, if
necessary, check con‐
tacts and repair if
required, replace sensor
Electrical technician,
ATEX electrical techni‐
cian
Mechanical faults
Description of fault
Cause
Remedy
Personnel
Gear motor makes loud
noises
Bearing damage on the
motor shaft
Replace bearings or
motor
Service
Overload
Monitor the process
parameters
Qualified employee
Monitor the process
parameters, makes loud
noises
Too great axial play in
the cam shaft bearing
Tighten / monitor adjust‐
ment nuts
Service
Overload
Monitor the process
parameters
Qualified employee
Mechanics sluggish
Too little axial play in the
cam shaft bearing (tight)
Monitor the adjustment
nut
Service
A piston is too tight in its
socket
n
Loosen the hydraulic
end screws
n
Press the hydraulic
end manually
upwards and
n
Re-tighten the
screws
Qualified employee
No stroke movement
despite motor running
Check mechanical com‐
ponents for breakage
Replace defective com‐
ponents
Service
Remedying Faults on the Drive Unit
29