Eurotherm Drives 635, Product Manual, Page: 62 / 79

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Product-manual Model: 635/DER u. 635/K DER 07-01-05-06-E-V1002.doc
Diagnosis and trouble shooting
9.3 Trouble shooting
The following list refers to faults which can occur during operation.
Display:
Error Explanation and remedy
no motor run despite current flow motor mechanically blocked?
motor brake released? 1)
motor runs unevently check setpoint wiring
check grounding and shielding
too high P-amplification in the speed controller
reduce value (with EASYRIDER setting/speed
controller or PROG-key)
too small I-time in the speed controller?
reduce value (with EASYRIDER setting/speed
controller or PROG-key)
no reaction of setpoint progression,
despite torque in standstill Limit switch functions
effective (BIAS)
no current flow;
no torque despite activating the regulator
correctly motor cables interrupted?
Is input "I extern" (X10.19) activated (config.
menu) and not notched up?
Are the inputs Enable N- and Enable N+ (config
menu) activated and not notched up?
Interference symptoms with power
frequency Ground loops in setpoint or actual value wiring?
Shieldings laid on both sides?
Signal cables near high voltage cables?
Motor takes up preferred positions after
activation Position encoder or motor cables with reversed
poles? Resolver or encoder incorrectly adjusted?
Number of motor poles wrong matching?
(config. menu) 1)
Motor runs up immediately after activation
although there is no setpoint Motor cables or resolver cables reversed?
Resolver incorrectly adjusted? 1)
Motor reaches in idling cycle very different
speed when running to the right or
to the left Resolver incorrectly adjusted
1) Display /3./ or /4./ mostly short after activating; before warning /8./