Mitsubishi Electric FR-A8APR, Instruction Manual

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PARAMETER
3.3 Protective function
• When a protective function activates, the inverter trips and a fault signal is output.

The data code is used for checking the fault detail via communication or for setting Pr.997 Fault initiation . (Refer to the Instruction
Manual (Detailed) of the inverter.)

With a break in excitation output cable, the protective function of E.OC[], E.OSD, E.OS and so on may be activated due to the resolver
input signal fault. If these protective functions are activated, check the wiring of the excitation output cable of a resolver and the details of
the corresponding protective function in the Instruction Manual (Detailed) of the inverter.
Operation panel
indication
E.MP FR-PU07 Fault
Name
Magnetic pole position unknown (Data code: 222 (HDE))

Description
When the offset value between the motor home magnetic pole position and the resolver home position is unknown, the
protective circuit is activated to stop the inverter output.
Check point
• Check that the resolver position tuning was performed.
• Check that the resolver position tuning ended properly. When
Pr.1105 Resolver magnetic pole position offset =
"9999", the resolver position tuning does not end properly.
Corrective action
• Perform resolver position tuning with Pr.373 . (Refer to page 33 .)
• Remove the cause of the tuning error, and perform tuning again. (Refer to page 33 .)
Operation panel
indication
E.ECT FR-PU07 E.ECT
Name
Signal loss detection (Data code: 210 (HD2))

Description
The inverter trips when the resolver input signal is shut off under orientation control, resolver (encoder) feedback
control, or vector control. This protective function is not available in the initial status. A break in excitation output cable
of a resolver cannot be detected.

Check point
• Check for the resolver input signal loss.
• Check that the resolver specifications are correct.
• Check for loose wirings of terminal block.
Corrective action
• Remedy the signal loss.
• Use a resolver that meets the specifications.
• Make connection securely.