Operation; Start, Stop And Reset Commands; Using The Soft Starter To Control A Motor; Soft Start Methods - AuCom MVE Series User Manual

OPERATION

7. Operation
CAUTION
We recommend testing the soft starter's setup on a low voltage motor before beginning operation on a
medium voltage motor. This allows the operator to test that the soft starter is correctly connected to the
auxiliary equipment.
7.1

Start, Stop and Reset Commands

The soft starter can be controlled in three ways:
• using the buttons on the controller
via remote inputs
•
• via a serial communication link
The LCL/RMT button controls whether the MVE will respond to local control (via the controller) or remote control (via
the remote inputs).
The Local LED on the controller is on when the soft starter is in local control mode and off when the soft starter is in
remote control mode.
Control via the fieldbus communication network is always enabled in local control mode, and can be enabled or
disabled in remote control mode (parameter 6R
requires an optional communication module.
The STOP button on the controller is always enabled.
7.2

Using the Soft Starter to Control a Motor

To soft start the motor, press the START button on the controller or activate the Start remote input. The motor will
start using the start mode selected in parameter 2A.
To stop the motor, press the STOP button on the controller or activate the Stop remote input. The motor will stop
using the stop mode selected in parameter 2H.
To reset a trip on the soft starter, press the RESET button on the controller or activate the Reset remote input.
To stop the motor with a coast to stop, regardless of the setting of parameter 2H
RESET buttons at the same time. The soft starter will remove power from the motor and open the main contactor,
and the motor will coast to stop.
7.3

Soft Start Methods

Constant Current
Constant current is the traditional form of soft starting, which raises the current from zero to a specified level and
keeps the current stable at that level until the motor has accelerated.
Constant current starting is ideal for applications where the start current must be kept below a particular level.
3
700%
600%
500%
400%
300%
1
200%
100%
10% 20% 30% 40% 50% 60% 70% 80% 90% 100%
Rotor speed (% full speed)
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| MVE User Manual (710-17074-00H)
Comms in Remote
2
). Control via the serial communication network
Stop Mode
Initial Current
1: (parameter 2C)
Current Limit
2: (parameter 2D)
3: Full voltage current
, press the local STOP and