RAM DBS II
Refrigeration Solid State Starter
1.6 LED Annunciation
LEDs, located on the front of the DBS control board, annunciate operating status and assist in
troubleshooting while the starter door is open.
READY LED (Green) indicates the DBS is in the READY state.
RUN LED (Green) indicates the DBS is in either the START or RUN state. The LED will blink when in
the START state, then turn on steady once the RUN state is reached.
ALARM LED (Yellow) indicates the DBS has detected an ALARM condition. The LED will blink until the
alarm is acknowledged (see Section 8.3). When the condition is no longer present, the LED will go out,
and normal operation can resume. If the condition is acknowledged, but is still present, the LED will turn
on steady and remain on until the alarm condition is removed. The control/display unit or Frick computer
will show the cause of the alarm.
TRIP LED (Red) indicates the DBS is in the TRIP state. The LED will blink until the trip is acknowledged
(see Section 8.3). When the trip condition is no longer present, the LED will go out, and normal operation
can resume. If the condition is acknowledged, but is still present, the LED will turn on steady and remain
on until the trip condition is removed. The KL4 control/display unit will show the cause of the trip.
1.7 Electronic Motor Overload Protection and Monitoring
The DBS electronically monitors and protects the motor, during both start and run states, by using, in
addition to user presets, a unique model of operating limits for the motor created from three-phase current
and voltage input signals. It also records pertinent operating history for troubleshooting and maintenance
purposes.
Fault conditions are annunciated and acknowledged through the DBS door-mounted KL4 control/display
unit.
The DBS electronic overload affords motor protection against the following conditions:
- Stalling
- Overheating
- Locked Rotor
Additionally the DBS microprocessor will detect the following conditions:
- Jam
- Short Circuit
- Phase Loss
- Current Unbalance
- Phase Reversal
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1.0 Description
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