Error Definition; Possible Causes - Carrier 38VMA Series Service Manual

Error Definition:

Error
Compressor module protection

Possible Causes:

•
Improper heat transfer by ODU system
•
Improper heat transfer by IPM, and IPM thermal protection
•
Improper input voltage for power supply
•
Improper connection for 3-phase U, V, W lines to compressor
•
Damaged compressor module
•
Damaged compressor
•
Improper refrigerant charge in the system
Terminals P, N, U, V, W of IPM
Detailed Definition
L0: Error in compressor module
L1: DC bus under-voltage protection
L2: DC bus over-voltage protection
L4: MCE fault / synchronization / closed
loop
L7: Phase lacking protection for 3-phase
lines U, V, W in compressor
L8: Protection for transient
variation >15Hz between the former
moment (2S) and the next moment
L9: Protection for setting speed
difference between transient variation
and actual operation >15Hz
Terminals P, N, U, V, W of IPM
Green LED (Number of Flashes)
Drive module of compressor
+15VDC
8
9
10
12
15
Light on for long time
16
17
+15VDC
Red LED
69