RAM DBS II
Refrigeration Solid State Starter
6.2 Start-Up
When starting the DBS controller, it is recommended that a clamp-on AC ammeter be used to continu-
ously monitor current during the start-up procedure. A voltmeter placed across the starter output
terminals (T1, T2, and T3) is also recommended.
6.2.1 Power-Up
1) Pre-start adjustments have been checked and confirmed.
2) Make certain all personnel, tools, and equipment are clear of controller and motor-driven moving
parts.
3) If the motor is remotely located, it is essential to have another person stand by the motor to verify
direction of motor rotation.
4) Apply power; close feeder switch then main circuit breaker (CB1). Confirm with voltmeter that
voltage to line side of DBS is within 10% of the starter's rated voltage.
5) DBS control board performs preliminary system diagnostics.
6) Green "READY" LED illuminates confirming all internal system tests have passed and there are no
shorted SCRs, phase reversal, or other faults.
6.2.2 Starting
WARNING! Do not manually operate contactor to jog motor. SERIOUS PERSONAL
INJURY OR EQUIPMENT DAMAGE MAY RESULT! To jog motor, follow
Starting Instruction below and equipment start-up instructions that apply.
1) Make sure the motor is ready to be started in an unloaded condition.
2) Set up voltmeter to measure for possible voltage drop during starting. Voltage should not drop more
than 10% of voltage rating of DBS controller.
3) Energize the “Start” circuit; motor will begin to accelerate; green “RUN” LED will blink.
4) Motor reaches full speed; green “RUN” LED remains on steady.
CAUTION! Do not allow motor to remain energized if it stalls. If the motor fails to
accelerate, immediately de-energize the motor by local, remote, or manual
stop control.
5) If at any time during the starting cycle the motor does not accelerate or stops, disconnect power to
the control circuit and open the line disconnect.
6) Make necessary adjustments and repeat starting procedure.
7) Should the motor still fail to start, consult Section 7.0, Troubleshooting.
6.3 Re-adjustments
After the motor has been started, fine adjustments may be required. The DBS chassis settings
should be adjusted so that the motor reaches full speed in the minimum amount of time without
causing any appreciable power dip or excessive mechanical stress.
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6.0 Start-Up Instructions
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