Current Follower
7.12 Current Follower
When the Starter Type parameter is set to Current Follower, the MX
2
is configured to operate as a Closed Loop current follower.
Current Follower mode can be used to control the current applied to motors, resistive heaters, etc. The Current Follower mode uses the
analog input to receive the desired current command and controls the SCRs to output the commanded current. The MX's reference
command can be generated from any 0-10V, 0-20mA or 4-20mA source such as a potentiometer, another MX
2
or an external controller
such as a PLC.
A reference input value of 0% results in no output. A reference input value of 100% results in a current output equal to the Motor FLA
setting. The actual voltage or current input that results in a given output can be adjusted through the use of the Analog Input Offset and
Analog Input Span parameters.
z NOTE: The power stack must be rated for continuous non-bypassed duty in order to operate in Current Follower mode.
z NOTE: When operating in Current Follower mode, the acceleration ramp, kick, and deceleration settings have no effect on operation.
z NOTE: The following motor / starter protective functions are available when in Current Follower mode:
167
7 - THEORY OF OPERATION
Figure 46: Current Follower Mode
• Current Imbalance • Phase Loss
• Over Current • Phase Rotation
• Under Current • Current while Stopped
• Over Voltage • Motor OL
• Under Voltage • Residual Ground Fault
• Over Frequency • Instantaneous Over Current (IOC)
• Under Frequency
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