Technical Manual
P&B Engineering
ISSUE 7 28/9/99
Page
41
16. Starting Methods.
The can control motors in a variety of different ways. The can also control circuit breakers.
This section details the different ways of controlling a motor and the new variables that need setting on the
.
16.1 Direct On Line.
With Direct On Line starting only Contactor A need be connected to an output. This form of starting allows the motor
to be run in one direction only. To start the motor the Start A button is pressed and the Stop button stops the motor.
16.2 Star/Delta.
For Star Delta starting both output relays Contactor A and B are used to start the motor with a switch of the three
phases from Star connection to Delta connection. This is controlled by the two output relays and the extra variables
listed below, which need to be set to accomplish a correct Star to Delta Start;
1)
Max Time In Star
2)
Transition Time
3)
Star To Delta At
To start the motor the Start A button is pressed and the Stop button stops the motor.
16.3 Reversing.
This starting method allows the motor to be started in both directions. Each direction of the motor is controlled by the
two output relays Contactor A and B. To start the motor in the forward direction press the Start A button. To start the
motor in the reverse direction press the Start B button. The Stop button stops the motor in whatever direction it is
running in.
16.4. Two Speed.
For two speed the two output relays are used to start the motor in either high speed or low speed. When a two speed
starting method is chosen there are two further variables to be set;
1)
Low Speed FLC (The existing FLC is taken for the High Speed)
2)
Low Speed t6x time (The existing t6x time is taken for the High Speed)
To start the motor in the high speed press the Start A button, To start the motor in the low speed press the Start B
button. The Stop button stops the motor at whatever speed it is running in.
16.5. Circuit Breaker.
The control of a circuit breaker is done using the Contactor A output relay. Contactor B is now used as a trip output
relay. The status of the circuit breaker is shown in the Contactor A Status of the Logical Inputs page. For the control
of a circuit breaker to be accomplished the following must be done;
1)
The Start/Stop Signal must be set to Momentary.
2)
The Welded Contactor trip and alarm options must now be Enabled.
3)
The Control Circuit Open trip and alarm options must now be Enabled
The Start A button closes the Circuit Breaker and the Stop button Opens the Circuit Breaker
Summary of Contents for MPC2000+
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