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Motor speed does not
correspond to setpoint
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Motor generating a
considerable amount of
noise (at the current limit)
and "OFF" signal is
implemented at slow speed
with little or no control,
possibly with error message
3.0
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Intermittent communication
error between VFD and
optional modules
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Table 14: FAQ operational problems
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BU 0200 en-US-4920
•
Analog input function set to "Frequency
additions"
and
another
present
•
Tracks A and B swapped by encoder (for
speed feedback)
•
Incorrect encoder resolution setting
•
Encoder power supply missing
•
Encoder faulty
•
System bus terminating resistors
incorrectly set
•
Poor connection contact
•
Faults on system bus line
•
Maximum system bus length exceeded
6 Operating status messages
•
Check P400
•
Check setting of integrated
setpoint
is
potentiometer (P1) (only
SK 2x5E)
•
P420, check active fixed
frequencies
•
Check bus setpoints
•
Check P104/P105 "min/max
frequency"
•
Check P113 "jog frequency"
•
Check encoder connections
•
Check P300, P301
•
Monitor via P735
•
Check encoder
•
First and last subscriber only:
set DIP switches for
terminating resistor
•
Check connections
•
Connect GND of all VFDs
connected to system bus
•
Pay attention to routing
regulations (separate routing
of signal and control cables
and power and motor cables)
•
Check cable lengths (system
bus)
235
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