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Trips and Fault Finding
7-1
590+ Series DC Digital Converter
7
T
RIPS AND
F
AULT
F
INDING
Trips
What Happens when a Trip Occurs
When a trip occurs, the Converter’s power stage is immediately disabled causing the motor and
load to coast to a stop. The trip is latched until action is taken to reset it. This ensures that trips
due to transient conditions are captured and the Converter is disabled, even when the original
cause of the trip is no longer present.
Converter Indications
If a trip condition is detected the unit displays and performs the following actions.
1.
The HEALTH LED goes out indicating a Trip condition has occurred. (Investigate, find
and remove the cause of the trip.)
2.
Terminal B6 (Healthy) goes low (0V).
Operator Station Indications
If a trip condition is detected the MMI displays and performs the following actions.
1.
The HEALTH LED goes out indicating a Trip condition has occurred. The MMI displays
the activated alarm. (Investigate, find and remove the cause of the trip.)
2.
Terminal B6 (Healthy) goes low (0V).
3.
The alarm message(s) can be acknowledged by pressing the
E
key, however, the unit will
not restart at this point.
Resetting a Trip Condition
All trips must be reset before the Converter can be re-enabled. A trip can only be reset once the
trip condition is no longer active, i.e. a trip due to a heatsink over-temperature will not reset
until the temperature is below the trip level.
Note:
More than one trip can be active at any time. For example, it is possible for both the
HEATSINK TRIP and the OVERVOLTS (VA) trips to be active. Alternatively it is possible for
the Converter to trip due to a FIELD OVER I error and then for the HEATSINK TRIP trip to
become active after the Converter has stopped (this may occur due to the thermal time
constant of the heatsink).
You can reset the trip(s) in one of two ways:
1. Power-up, or remove and re-apply the auxiliary power supply.
2. Stop and start the converter, i.e. remove and re-apply the Start/Run signal (terminal C3 or
C4, or the STOP and RUN keys on the MMI).
Success is indicated by the HEALTH LED (on the unit or MMI) illuminating. The MMI will
return to its original display.