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OM-2065 / Operation and Maintenance Manual
90SB51 / Spec. 7015-3 / Frequency Converter
g. IMB/GND
When the indicator light marked "IMB/GND" on ALARM III comes on, this indicates that a load
imbalance of at least 10% exists between output phases or one of the output phases is grounded.
Check to see where the imbalance is, then balance the load as much as possible or check and
remove ground on output phase. Reset and restart.
h. DC FUSE
When the DC FUSE green indicator light on ALARM III board is not lit, that means the fuse has
blown. Various sections have to be checked till fault is diagnosed and corrected. Refer to
troubleshooting charts later in this chapter.
i. A, B, C, D (E, F NOT USED ON THIS UNIT)- INVERTER SECTIONS.
When an indicating light for an inverter section on ALARM I comes on, this indicates an excessive
current draw through one transistors heat sink assembly. Check for a cause of the excessive
load,(See Troubleshooting Charts) and remove the cause. Check also the DC FUSE indicator, since
overcurrent in this circuit could cause the DC fuse to blow.
Chapter 3-1
Page 4
Nov 01/90
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