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Mitsubishi Electric FR-A520-0.4K -55K Instruction Manual Page 195

Transistorized inverter, high function & low acoustic noise.
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( 5 ) Motor current is large.
·
Check that the load is not too heavy.
·
Check that the torque boost (Pr. 0, Pr. 46, Pr. 112) setting is not too large.
( 6 ) Speed does not increase.
·
Check that the maximum frequency (Pr. 1) setting is correct.
·
Check that the load is not too heavy. (In agitators, etc., load may become heavy in winter.)
·
Check that the torque boost (Pr. 0, Pr. 46, Pr. 112) setting is not too large to activate the stall
prevention function.
( 7 ) Speed varies during operation.
During operation under advanced magnetic flux vector control, the output frequency varies with load
fluctuation between 0 and 2Hz. This is a normal operation and is not a fault.
1) Inspection of load
·
Check that the load is not varying.
2) Inspection of input signal
·
Check that the frequency setting signal is not varying.
·
Check that the frequency setting signal is not affected by induced noise.
3) Others
·
Check that the settings of the applied motor capacity (Pr. 80) and the number of applied motor poles
(Pr. 81) are correct for the inverter and motor capacities in advanced magnetic flux vector control.
·
Check that the wiring length is within 30m (98.42 feet) in advanced magnetic flux vector control.
·
Check that the wiring length is correct in V/F control.
( 8 ) Operation mode is not changed properly.
If the operation mode is not changed properly, check the following:
1. External input signal ............. Check that the STF or STR signal is off.
2. Parameter setting ................. Check the Pr. 79 setting.
( 9 ) Operation panel (FR-DU04) display is not provided.
·
Make sure that the operation panel is connected securely with the inverter.
( 10 ) POWER lamp is not lit.
·
Make sure that the wiring and installation are correct.
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PROTECTIVE FUNCTIONS
When it is on, the operation mode cannot be changed.
When the setting of Pr. 79 "operation mode selection" is "0" (factory
setting), switching input power on places the inverter in the external
operation mode. Press the operation panel's [MODE] key three times
and press the [UP] key (press the [PU] key for the parameter unit
(FR-PU04)). This changes the external operation mode into the PU
operation mode. For any other setting (1 to 8), the operation mode is
limited according to the setting.
181

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