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AMPGARD RVSS
Reduced Voltage Soft-Starter
User Manual
2.2.11 Line frequency deviation
RVSS monitors line frequency and can be configured using either
the MUI or inControl to generate an alarm and a fault condition for
line frequency above or below acceptable levels, or phase-lock, or
severe undervoltage conditions. In general, alarm and trip levels are
set about 10% above MPR settings, as a backup.
2.2.12 Phase rotation mismatch
RVSS compares expected phase rotation with actual and generate a
fault if there is a mismatch.
2.2.13 Main contactor failed to close
RVSS monitors main contactor status. If the main contactor auxiliary
interlock opens during a start sequence, a fault is generated. If that
occurs after the start is complete and the motor is running, or if the
system is in Bypass mode, an alarm is generated.
If the DSP energizes the MX coil right before the Soft-Start ramp
begins, and the main contactor does not close, an immediate Fault
is generated.
If the unit performed a start sequence, has transitioned to Bypass
and is running, and then the main contactor auxiliary interlock
feedback signal is lost (main contactor open), the controller checks
the phase current RMS (a percentage of motor FLA). If the phase
current is above 20% of motor FLA, an Alarm is generated. If it is
below 20% motor FLA, the control logic concludes that the main
contactor is actually open, so it generates a Fault.
This logic can also be used to determine if an external E-Stop
caused the main contactor to open.
This is a way to eliminate the need for a separate MPR relay
feedback, since one MPR interlock output is usually in the MX relay
coil control rung and another is in the CR relay control rung.
This also helps determine if an external customer E-Stop signal
de-energized the MX control relay, de-energizing the RVSS main
contactor coil and opening the contactor.
2.2.14 Bypass contactor failed to close
RVSS monitors Bypass contactor status. If the contactor auxiliary
interlock opens during a start sequence, a fault is generated. If that
occurs after the start is complete and the motor is running, or if the
system is in Bypass mode, an alarm is generated.
2.2.15 No ramp type is selected
Since RVSS is extensively configurable, the system protections
include confirming that a Starter Profile has been selected as a
permissive for start operations. In addition, the Active Operation
Mode must point to the selected Starter Profile. If these conditions
have not been met, starter operations will be inhibited, and a Fault
will be generated with a fault MUI message.
2.2.16 Motor instantaneous overcurrent
Motor instantaneous overcurrent is a configurable RVSS parameter.
Alarm level, Trip Level and Trip Delay settings are settable using
either the MUI or inControl. The setpoints should be established
based upon motor characteristics and are usually set around 10%
higher than those established for the MPR, as a backup.
This protection is useful if a Motor FLA is much less than the Truck
FLA and differs from the Truck Instantaneous Overcurrent and Jam
Protection.
2.2.17 Time Between Starts
There is a programmable timer that times from the edge of a Start
and prevents frequent re-Starts if programmed other than a zero
value. The MUI will Alarm a Starter Not Ready ACODE 8 if the RV
Soft-Starter is attempted within this time.
Instruction Booklet IB020003EN
2.2.18 BackSpin Inhibit
The BackSpin Inhibit function includes a programmable timer,
activated after a Stop to prevent frequent re-Starts. The MUI will
alarm a Starter Not Ready (Alarm Code 8) if an attempt is made to
start the Soft-Starter before the timer times out. This is useful in
lightly-loaded motors or pumps pumping against a head pressure,
to prevent a start attempt while the pump motor is back-spinning as
the fluid comes to a stop.
2.2.19 1Ph/Unbalance Voltage ....
2.2.20 1Ph/Unbalance Current ....
2.2.21 Ground Fault
The RVSS DSP uses phase current feedback to calculate a residual
ground current. This protection can be configured for Fault, Alarm,
and Ignore. Typically, the MPR will be programmed for GFCT
protection. In that case, this protection should be disabled (ignored).
2.2.22 External Fault
Digital Input 1 (DIN1) on the I/O Board can be configured to process
a normally-open or normally-closed short-delay external fault such
as a motor protective relay (MPR) contact output or other external
condition.
2.3
Optional motor protective relay
The AMPGARD RVSS includes configurable motor protection
features, but it can also accommodate an external motor protective
relay. This relay is mounted on the starter low voltage compartment
door, in a cutout provided for the purpose. When included, the relay
must be configured for the protection features desired, and its
separate outputs wired into the RVSS field-wire CR relay ladder logic
rung, and the MX pilot relay rung (see the RVSS low voltage control
schematic, Figure 10). When a motor protective relay is to provide
the same protection functions available in the RVSS, the RVSS
should have those protection settings set higher than the MPR, to
avoid conflicts, with the MPR configured to trigger first.
If a Spare MPR Trip contact is available other than what is wired
into the MX and CR ladder logic rungs, it can be wired into DIN1
External Fault of the I/O Board. Otherwise if the MPR trips the Main
Contactor there is added logic in the Main Contactor fault logic as
described previously (see.2.2.13 Main contactor failed to close).
2.4
Monitoring
The AMPGARD RVSS includes monitoring features to present
system information to the Operator. This system information can be
displayed on the Monitoring User Interface, or transmitted to remote
intelligent devices. A list of the system parameters monitored is
shown in section 3.
Monitoring User Interface
An easy way to access local monitoring is with the Monitoring User
Interface (MUI). The LCD screen provides large font display of all
parameters divided into menus of current, voltage, power, thermal
and other system parameters.
Power XPert inControl
Another monitoring option is the Power Xpert inControl software
tool. Common operating parameters are in the Control/Monitor
tab while other parameters related to current, voltage, power
and system data are viewable in the Measurement tab. Connect
to inControl using the BCM micro-USB Serial, RS-485 series, or
Ethernet port connections on the EDC (BCM Ethernet card).
Effective January 2021
EATON www.eaton.com
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