TROUBLE SHOOTING
7-5
2. The motor rotates, but the speed does not increase.
Possible Causes What to Check and Suggested Measures
1. The maximum
frequency was set to too
low a value.
Check the data of function code F03.
→ Correct the data of the maximum frequency (F03).
2. The peak frequency of
the frequency limiter
was set to too low a
value.
Check the data of function code F15.
→ Correct the data of the peak frequency of the frequency limiter
(F15).
3. The set frequency was
set to too low a value.
Check the signals for the set frequency from the control circuit
terminals with Menu#4 “I/O checking” using the keypad.
→ Increase the set frequency.
→
If an external potentiometer for fre3quency command, signal
converter, switches, or relay contacts are malfunctioning, replace
them.
→ Connect the external circuit wires to terminals
and (C1) correctly.
4. A frequency command
with higher priority
than the one attempted
(e.g. multistep
frequency,
communications or
jogging operation, etc.)
was active and the set
frequency was set to too
low a value.
Check the higher priority run command with Menu#2 “Data
checking” and Menu#4 “I/O checking” using the keypad, referring to
the block diagram of the drive command generator.
Refer to the FRENIC-Mini User’s Manual (MEH446)
→ Correct any incorrect function code data settings (e.g. cancel the
higher priority run command, etc).
acceleration/deceleratio
n time was too long.
Check the data of function code F07, F08, E10, E11 and H54.
→ Change the acceleration/deceleration time to match the load.
6. Overload
Measure the output current.
→ Lighten the load (e.g. operate the mechanical brake correctly).
7. The current limiting
operation did not
increase the output
frequency.
Check whether current limiting is active or not with Menu#3 “Drive
monitoring” and check the current limiting level (F44) using the
keypad.
→
Change the level of the current limiting (F44) to an appropriate
value.
Decrease the value of torque boost (F09), then turn the power off and
back on again and check if the speed increases.
→
Check the data of function codes F18, C50, C32, C34, C37 and C39
→ Change the bias and gain to correct values.
incorrectly.
Check the data of function codes F18, C50, C32, C34, C37 and C39
→ Change the bias and gain to correct values.
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