Motor Current Is Large; Speed Does Not Increase; Speed Varies During Operation; Operation Mode Is Not Changed Properly - Mitsubishi Electric FR-F500 Instruction Manual

5.2.5 Motor current is large.

• Check that the load is not too heavy.
• Check that the torque boost (Pr. 0, Pr. 46) setting is not too large.

5.2.6 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) setting is not too large to activate the stall prevention function.
• Check that the brake resistor is not connected to terminals P-P1 accidentally.

5.2.7 Speed varies during operation.

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.

5.2.8 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.

5.2.9 Operation panel (FR-DU04) display is not provided.

• Make sure that the operation panel is connected securely with the inverter.

5.2.10 POWER lamp is not lit.

• Make sure that the wiring and installation are correct.

5.2.11 Parameter write cannot be performed

• Check that operation is not being performed (signal STF or STR is not ON).
• Check that the [SET] key ([WRITE] key) is pressed for longer than 1.5 seconds.
• Check that you are not attempting to make parameter setting outside the setting range.
• Check that you are not attempting to make parameter setting in the external operation mode.
• Check the setting of Pr. 77 "parameter write inhibit selection".
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 (0
to 4, 6 to 8), the operation mode is limited according to the setting.
(For the detail of Pr.79, refer to 100 page)
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PROTECTIVE FUNCTIONS