16 May 101

Symptom: MGTC-20, DXTC-20, DXTH-20 – ERROR CODE FH

Solution: NORMAL PROTECTION

Cause: LIMITING/REDUCING FREQUENCY FOR COMPRESSOR DRIVING PROTECTION

Remarks:

DESCRIPTION:

WHENEVER THE BUS VOLTAGE IS TOO LOW.

WHEN THE BUS VOLTAGE REACHES TO THE POINT WHERE FREQUENCY LIMITATION/REDUCTION IS NEEDED, IT WILL ACTIVATE THE FH PROTECTION.

REPAIR:

1) THIS IS A NORMAL PROTECTION