Phase Control
7.11 Phase Control
When the Starter Type parameter (FUN07) is set to Phase Control, the MX
3
is configured to operate as a phase controller or voltage
follower. This is an open loop control mode. When a start command is given, the RUN programmed relays energize. The firing angles
of the SCRs are directly controlled based on voltage or current applied to the Analog Input.
A reference input value of 0% results in no output. A reference input value of 100% results in full (100%) output voltage. The actual
input voltage / current that results in a given output can be adjusted through the use of the Analog Input Offset and the Analog Input
Span parameters.
z NOTE: The power stack must be rated for continuous non-bypassed duty in order to operate in Phase
Control mode continuously, NO BYPASS.
z NOTE: When operating in Phase Control mode, the acceleration ramp, kick, and deceleration settings have no effect on operation.
z NOTE: When in Phase Control mode the following motor / starter protective functions are available:
•
Current Imbalance Residual Ground Fault
•
Over Current Instantaneous Over Current (IOC)
•
Current while Stopped Phase Rotation
•
Under Current Phase Loss
•
Over Voltage Under Frequency
•
Under Voltage Over Frequency
•
Motor OL
173
7 - THEORY OF OPERATION
utput Voltage vs Analog Input
0
10
20
30
40
50
60
70
80
90
100
0 102030405060708090100
Analo
Input
%
Output Voltage (%)
Figure 55: Phase Control Mode
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