Pag.24
7
Faults and remedy
Fault
Causes
Adjustment
Noises on elevator
machine
Bearing defective Contact customer service
Interference on encoder signals Check correct shield to ground connection
for the encoder cable
Encoder not locked Fix the encoder position
Wrong setting at the frequency inverter Check setting at the frequency inverter
Absolute encoder defective Change absolute encoder
Excessive temperat
ure /
Temperature
protection
trips
Surface of the elevator machine is covered Remove cover from drive or mount with
more distance to the elevator machine.
Ambient temperature higher than 40 °C Enhance ventilation
Wrong setting at the frequency inverter Check setting at the frequency inverter
Elevator machine
does not start
Motor phases connected incorrect Check motor connection
VVVF defective Check VVVF
Brake does not release See brake faults
Overloading Check if the lift is correctly balanced
Elevator machine
does
not turn when
the brake is
released
Brake rotor sticks after a long storage time
on the armature disk
Release the brake mechanicaly or remove it
and loosen the brake rotor carefully from the
armature plate.
Brake switching
noises
Brake is switched on the DC-side Modify the control to AC switching for nor-
mal operation. Fit an additional protective
circuit.
Air gap of brake too big Replace the brake rotor (Special tool re-
quired! Contact the customer service of
GEM S.r.l.).
Brake does not re-
lease
Power supply too low. The voltage at the
brake is too low.
Check supply, if necessary increase cable
cross-section (and transformer)
Brake control wrong / defective Check brake control
Brake coil defective Replace brake (special tool required.
Contact customer service of GEM S.r.l.)
Brake worn out Replace the brake rotor (Special tool re-
quired! Contact the customer service of
GEM S.r.l).
Brake release moni-
toring does not
switch
Microswitch defective
Replace microswitch (see
“
Installation
Manual for EVO Brakes
”
)
Contacts dirty
Operate microswitch
with a higher contact
current, at least
10 mA or replace
microswitch
8
Service and maintenance
8.1
General notes on maintenance
Observe the safety-at-work regulations! Service and maintenance can only be performed by trained
personnel.
Disassembling the elevator machine can only be done with special devices!
Caution, strong magnetic force!
Never use a high-pressure cleaner (for example steam jet cleaner) for cleaning the elevator
machine!
Take note of abnormal operating noise.
The bearings have a lifetime lubrication. There is no possibility to relubricate. Maintenance is not
necessary for the bearings.
To check the brake wear or to check the traction sheave, the following instructions have to be
referred:
“Installation Manual for EVO Brakes”.
It is not possible to adjust the brake. The brake cannot be readjusted. Replace the brake rotor
when
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