Parker 590 series, Product Manual

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7-2
Trips and Fault Finding
590 Series DC Digital Converter
LAST ALARM
This display shows the last alarm message to have been displayed. To reset the parameter simply
press the
↓
(DOWN) key to clear the alarm. Alternatively, you can switch the auxiliary supply
off and on, causing NO ACTIVE ALARMS to be displayed.
HEALTH WORD
This parameter is used to continuously monitor the status of the Converter. As alarms are added
or removed, the display will immediately update to show the hexadecimal sum of these alarms.
The value reverts to 0x0000 when the Start (C3) input is raised (+24V), and when no trip
condition is present.
HEALTH STORE
This displays the hexadecimal value of the first (or only) alarm to occur causing the trip
condition.
The display reverts to 0x0000 when the Start (C3) input is raised (+24V).
Using the MMI to Manage Trips
Trip Messages
Most of the alarms have a delay timer so that the Converter only trips if the condition persists
for the whole of the delay period.
If the Converter trips, then the display immediately shows a message indicating the reason for
the trip. The possible trip messages are given in the table below.
Trip Message and Meaning Possible Reason for Trip
OVERSPEED
Motor overspeed - the speed feedback
signal has exceeded 125% of rated
speed.
Badly adjusted speed loop (alarm only operates with
encoder or armature volts feedback selected)
Alarm time delay : 0.1 seconds
MISSING PULSE
A missing pulse from the 6-pulse
armature current waveform. Trips when
the motor loading exceeds 1.5 times the
DISCONTINUOUS parameter value.
Firing plug failure
Connection failure
Alarm time delay : 60 seconds
FIELD OVER I
The motor field current has exceeded
120% of the calibrated value
Regulator failure
Badly tuned control loop (alarm only operates with
field current control mode selected)
Alarm time delay : 15 seconds
HEATSINK TRIP
The Converter heatsink temperature is
too high
The ambient air temperature is too high
Poor ventilation or spacing between Converters
Fan failure, check fuse FS1 on power board, wrong
rotation (models above 70A bridge rating)
Blocked ventilation slots
Clogged air filters
Excessive armature current - nominal armature
current on motor nameplate should be checked
against the current calibration for the Converter.
Note: The stack must be allowed to cool in
order to re-start the Converter.
Alarm time delay : 0.75 seconds