Control Techniques FXM5, User Manual

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FXM5 User Guide
25
Issue Number: 5 www.controltechniques.com
5 Fault Finding
Users must not attempt to repair the FXM5 if it is faulty, nor carry out fault
diagnosis other than through the use of the diagnostic features described in this
section.
Under no circumstances must the casing of the FXM5 be opened when the AC
supply is connected.
If the FXM5 is faulty, it must be returned to an authorized Control Techniques
distributor for repair.
Electric shock risk
If the FXM5 controller has been energized, the supply must be isolated for at least
five minutes. This allows the internal capacitors to discharge fully before work
may continue. Refer to Safety information on the inside front cover of this user
guide.
WARNING
WARNING
Fault Possible cause Action
The AC supply isolator does
not close
The field current is low, causing
the field-failure relay to be de-
energized.
Remove the cover and check all
the fuses.
LED bar indicator indicates
zero
Faulty field-winding connections.
The SET MIN FIELD
potentiometer is set at the fully
anti-clockwise position.
Check the field winding
connections.
Check and, if necessary, adjust
the SET MIN FIELD
potentiometer.
LED bar indicator indicates
maximum No armature voltage signal
applied to the FXM5 controller.
Check fuses FS1 and FS2.
The motor does not attain
maximum speed
The SET MAX ARM V
potentiometer is set too high or
6.07 is not set.
Adjust the potentiometer RV1 or
parameter 6.07
The motor lacks torque
and / or
The field-failure relay trips
when the motor is at high
speed The SET MAX ARM V
potentiometer is set too low or
6.07 is too low
or
The SET MAX FIELD
potentiometer or parameter 6.08
is too low. Adjust the potentiometer RV1 or
set parameter 6.07
Adjust RV2 or set parameter 6.08
The Drive trips on current
over-load when the motor is
normally loaded.
The maximum field current is set
too low
Adjust the SET MAX FIELD
potentiometer RV2 or parameter
6.08
The field-failure relay trips
when the motor is under
rapid acceleration
The minimum field current is set
too low
Adjust the SET MIN FIELD
potentiometer RV3 or parameter
6.10