CHAPTER 2: INSTALLATION
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Figure 2-43: Autotransformer closed transition starter typical control wiring - IO_E
(expansion module in slot "E")
The above drawing applies only to a high-voltage power supply. If a low-voltage (DC)
power supply is used, an appropriate DC voltage source must be used for this power
Autotransformer closed transition starter is a reduced voltage starter. Three motor
contactors R, 1S and 2S each controlled by a separate MM300 output relay are used to
perform this function. There are two options of this starter: 1S-2S and 2S-1S. For more
details please refer to chapter Autotransformer open transition starter in section
Configuration setpoints / Motor setpoints section of the manual.
Connect AUX VT to the Control Supply for correct operation of the UV Restart feature and
correct input readings.