RAM DBS II
Refrigeration Solid State Starter
22
7.0. Troubleshooting
CAUTION! Equipment is at possibly lethal AC line voltage when AC power is
connected. All Phases must be disconnected by shutting down main
power feed to this unit before it is safe to touch motor terminals or
control equipment parts.
7.1. Start-Up Problems
TABLE 10
Diagnostics and Troubleshooting
START-UP SYMPTOM
1. Motor will not start.
2. Controller does not make
transition to RUN
3. Cannot enter EDIT mode to
change setpoint values.
4. Circuit breaker trips about 5
seconds after energizing
controller.
5. No display text and/or lights on
front of DBS boards.
6. No display text and "ready" LED
is on.
7. Motor does not stop when run
signal is removed.
SOLUTION
Confirm 115V exists between
terminals 4 and 5 on DBS control
board.
Connect motor per motor nameplate.
Setpoint values cannot be changed
while motor is running.
Status code "rdy", "trip", or "cool"
must appear on display.
Motor leads must be properly
configured and connected to DBS
controller for it to operate.
Replace with slo-blo type fuse
FU-0081. See Figure 6.
Check primary and secondary
voltage on control power
transformer. Remove power before
replacing fuse(s).
Determine condition by
interchanging cable or display with
those from another controller;
replace if necessary.
Output module on customer's micro
could be shorted.
POSSIBLE CAUSE
No start input signal.
Motor connected for wrong voltage
or connected incorrectly.
DBS controller is in "Start" or
"Run" state.
Motor not connected or not
connected properly.
Blown fuse FU1 on DBS control
board.
No voltage output from control
power transformer.
Defective display or display cable.
Leakage from solid state output
modules on customer's micro
keeps DBS input turned on.
7.0 Troubleshooting
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