Ampgard It. Soft Start - Eaton Cutler-Hammer AMPGARD Technical Data Manual

AMPGARD IT. Soft Start

The 400 ampere AMPGARD IT. Soft Start requires one full height
structure with a full voltage starter in the upper compartment bus
connected to a soft start truck assembly in the lower compartment.
The soft starter includes internal fault protection and built-in basic
motor protection. The standard assembly includes an MP-3000 motor
relay for advanced motor protection.
Why is Soft Starting Desirable?
Eliminate shock to your mechanical components.
Avoid coupling and shaft damage.
Prevent rotor and winding failure.
Stop drive belt squeal and breakage.
Prevent water hammer in pipes.
Soft stop the pump motors.
Reduce pressure so valves close gently.
Avoid the surge wave.
Reduce peak starting currents.
Reduce voltage drop on motor start.
Ratings
2300 – 4800 Vac grounded systems.
60 kV BIL impulse rating.
Continuous current: to 400 amperes.
The AMPGARD IT. Soft Start is recommended for application only on
power systems that are solidly grounded or resistance grounded.
Ungrounded systems are not recommended.
Industry Standards
The AMPGARD IT. Soft Start is designed and built to meet all applica-
ble industry standards including UL listing as a complete assembly.
NEMA ICS3 – 1993
UL 347
CSA
EEMAC E14-1
Manufactured in an ISO 9001 and ISO 14001 certified facility
EATON CORPORATION Cutler-Hammer Chiller Starter (AMPGARD) Technical Data TD02003003E
Starting Characteristics
The soft start controller provides a number of selectable starting
characteristics as standard:
Kick Start
Provides an initial boost of current to overcome motor and system
inertia.
Ramp Start
Operator sets the initial starting torque value then raises the torque to
full voltage.
Current Limit
Limits the maximum starting current. Used in long start time applica-
tions and motor protection applications.
Soft Stop
Provides extended coast to rest time. Used in high friction load
applications where a sudden stop may cause system damage.
An optional pump control algrithm provides a special S shaped torque
curve that can eliminate water hammer in hydraulic systems.
AMPGARD IT. Soft Start
Full Voltage
Starter Cubicle
MP-3000 Relay
Soft Start
LV Control
Compartment
Drawout
SCR Truck
(Located Behind
MV Door)
Copyright 2006 11