Operation; Reduced Voltage Operation - Eaton AMPGARD Series Instructions For Installation, Use And Maintenance Manual

Instruction Leaflet
Page 11 Effective: March 2010
Section 3 – Operation
3.1

Reduced Voltage Operation

Refer to the schematic in Fig. 12 for the following
description of operation. The AMPGARD RVSS
includes a main isolation contactor M that closes just
before soft start ramping begins and opens after a
stop is completed. During a fault condition, the
RVSS control system will shut down the soft start
and then the main contactor will open. During a
short circuit or ground fault detected by a separate
motor relay, the relay will immediately open the main
contactor to limit potential damage to the system.
See the notes on the schematic for programming the
relay.
When the start contact is closed and no trip condition
is present, control relay CR closes, main contactor M
closes, and the RVSS begins ramping. Bypass
contactor B closes when the motor reaches full speed
as determined by both time and current settings.
The RVSS is set at the factory with typical starting
characteristics that perform well in most applications.
After the power and control connections have been
made, use the initial RVSS settings to operate the
motor. If you wish to review the settings or make
adjustments to fit your application, see section 5.1.2
of DEH41021 (Medium Voltage Solid State OEM Soft
Starter Manual). Note that if using the internal
overload protective function in addition to the
primary motor protective relay and the minimum FLA
setting is larger than the motor FLA, set the Overload
Trip FLA to the minimum available.
Instructions for Installation,
Operation, and Maintenance of the
AMPGARD Reduced Voltage Soft Starter
AFTER TURNING OFF POWER, WAIT AT LEAST
15 MINUTES BEFORE MAKING CONTACT WITH
THE RVSS POWER POLES BECAUSE HIGH
VOLTAGE MAY BE PRESENT.
Fig. 11
For more information visit: www.cutler-hammer.eaton.com
Cutler-Hammer
AMPGARD RVSS Outline
IB48068