Emerson AMPGARD RVSS Instruction Booklet page 105

AMPGARD RVSS
Reduced Voltage Soft-Starter
User Manual
 Verify programming of the RVSS. Protection settings on the RVSS are for backup to
the MPR. The RVSS settings can be adjusted to wider guard levels. Guard levels are
defined as 10% larger than the MPR settings.
 Remove extension cord and replace test plug.
Medium-Voltage Power Inspections
 Close Ampgard RVSS isolation switch, remove LOTO of the feeder, and apply
Medium-Voltage to the gear. Verify power-up of the control circuit.
 Observe the voltage metering on the on RVSS MUI and verify it agrees closely with the
MPR readout.
 Verify with the site operations it is ok to energize the motor and rotate the shaft. All
sequencing of non-Eaton gear and Start/Stop logic needs to be considered (e.g.
closing/opening valves or louvres, Emergency Stops, etc.) before proceeding.
 Place the RVSS Start Mode in Jog Forward at 10% Jog Voltage in Soft-Start
Configuration menu. If the controller Faults on Pre-Start Check FCODE 4 observe
the Pre-Start Sub-Code Reason in the Faults and Events group of the MUI,
otherwise Stop the controller to avoid nuisance Incomplete Sequence fault timeout.
In these rare circumstances consult the training troubleshooting guide or contact the
factory before changing the RVSS' Pre-Start check enable decimal value or Fault
Disable decimal value.
 The load should be coupled to the motor at this point. Bump the motor shaft for rotation
by raising the Jog Voltage % in increments. Rotation hazard! Initiate a momentary
Start-Stop sufficient to cause motor rotation. If the motor hums but the shaft does not
rotate, the % Jog voltage is too low. It should be raised in increments of 5 to 10% and
retried until it begins rotation within a second. Record this number as good setting for
the voltage ramp Initial Voltage % for the step below. If above 50% consider Kick-Start.
 Return the RVSS Start Mode to Voltage Ramp with Current Limit.
 Enter the Initial Voltage % in Soft-Start Configuration found above, typical value 20 to
40%. Set Start Ramp Time to appropriate value, usually twelve to twenty seconds. Do
not confuse Start Ramp Time with Incomplete Sequence Time (e.g. acceleration time).
 Verify the Soft-Start Configuration Current Limit %. Typically it is set between 375%
to 500% of motor FLA based upon the LRC code of the motor nameplate. A good value
ranges between 65% to 80% of LRC code which is a multiplier of the motor FLA.
 Verify the Soft-Start Configuration Incomplete Sequence setting. This is the time
allowed for the motor shaft to accelerate and pull up close to synchronous speed and
Bypass the RVSS truck to Run state. A typical value is 18 to 40 seconds.
 Check with the site operator if Soft-Stop with the RVSS is required or whether Coast
Stop is acceptable. Change the Stop Mode accordingly, and Soft-Start settings for Decel
Stop if need be. A good Initial Decel Voltage is 53% unless line-side PFCCs are
installed and switched in, if so use a lower value closer to 30%. The Final Voltage % is
typically 20% and as low as 10% with PFCCs. The Stop Time is typically 15 seconds
and low as 8 Seconds. When using Decel Soft-Stop if irregular audible motor shaft
noise or oscillating phase current is observed on an oscilloscope try lowering the Initial
Decel Voltage in 3% increments on repeat Stops until it is diminished.
Instruction Booklet IB020003EN
Effective January 2021
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EATON www.eaton.com
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