RAM DBS II
Refrigeration Solid State Starter
24
TRIP CONDITION
5. Phase Loss
6. Phase Reversal
7. Heat Sink Overtemperature
8. PLL Failure
SOLUTION
Restore power.
Repair CT connection at TB2 on DBS
control board.
Replace DBS control board.
Check gate lead connections P3 thru
P8 on DBS control board. Repair
gate plug connection or connector. If
connections are OK, replace DBS.
Check operation of contactor by
connecting coil to remote source of
control power.
Check continuity between terminals 2
and 3 on 15-pin connector on DBS
control board; If none, call RAM
Technical Services.
NOTE: Control power must be
cycled OFF then ON to reset trip.
Reverse L1 and L2 power wires at
DBS chassis input.
Verify control power not derived from
source outside controller.
Repair gate plug connection or
connector.
Allow starter to cool, then
re-start motor.
Assure ambient temperature does not
exceed 40 deg. C.
NOTE: Controller load capacity must
be derated when ambient temperature
exceeds 40 deg. C.
Replace defective heat sink cable
(P/N HA-0879, Chassis B & C;
HA-0880, Chassis D & E).
Replace thermostat (P/N SW-0345).
Test power quality; consult facility
engineer or utility.
POSSIBLE CAUSE
Loss of at least one phase of
supply voltage.
CT connector TB2 on DBS
control board may be loose.
DBS control board is defective.
Gate plug P4 or P6 may be
loose. When the start signal is
given, if P4 is loose, LED DS1
will be off; if P6 is loose, LED
DS2 will be off.
Defective bypass contactor.
Bypass contactor not energizing.
Incorrect phase order at DBS
chassis input terminals.
Control power is out of phase
with main power supply to
controller.
If fault will not clear fault, gate
connector P8 may be loose.
Temperature of heat sink has
exceeded maximum safe
operating temperature of 85 deg. C.
Heat sink cable connection P2 is
loose.
Defective thermostat.
Poor quality of incoming power.
TABLE 10 (continued) 7.2 Trip Conditions
7.0 Troubleshooting
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