0H1: Communication Error Between Main Control Chip And Communication Chip; 0H2~0H3: Incorrect Number Of Odus - Carrier 38VMA Series Service Manual

g. 0H1: Communication Error Between Main Control Chip and Communication Chip
1. Error display:
ODU display: 0H1
2. Applicable models:
38VMA***HDS5-1 (208/230V-3Ph-60Hz)
38VMA***HDS6-1 (460V-3Ph-60Hz)
3. Error definition:
Communication fault of main control chip IC55 and communication chip IC33 on main board.
4. Possible causes:
•
Improper power supply
•
Damaged transformer
•
Damaged main board
h. 0H2~0H3: Incorrect Number of ODUs
1. Error display:
ODU display: 0H2 or 0H3 (displayed on header unit only)
2. Applicable models:
38VMA***HDS5-1 (208/230V-3Ph-60Hz)
38VMA***HDS6-1 (460V-3Ph-60Hz)
3. Error definition:
0H2 -- The number of physical connected follower units to master unit is less than ENC1 rotary switch setting.
0H3 -- The number of physical connected follower units to master units is more than ENC1 rotary switch setting.
4. Possible causes:
•
Improper power supply for ODU
•
Duplicated address setting for ODU
•
Communication lines between ODUs are installed incorrectly
•
Damaged communication terminal block or main board for ODU
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