CHAPTER 2: INSTALLATION
Type IO_C module
MM300 MOTOR MANAGEMENT SYSTEM – INSTRUCTION MANUAL
Figure 2-23: Typical wiring for type IO_C module
Motor Management System
CONTACT INPUT 6 +
CONTACT INPUT 5 +
CONTACT INPUT 4 +
CONTACT INPUT 3 +
CONTACT INPUT 2 +
CONTACT INPUT 1 +
CONTACT OUTPUT 2
CONTACT OUTPUT 1
The IO_C module contains two form-A contact output relays, six digital inputs and control
Contact inputs can be programmed to any of the input functions, such as field stop or
process interlock. The exception is that contactor A status is fixed as the first contact input,
and contactor B status (where used) is fixed as the second contact input.
An AC auxiliary supply must be connected to terminals 12 and 13. This auxiliary voltage
(from slot C only) is also used for actual value indication, for auxiliary undervoltage, and for
undervoltage restart. When three-phase voltages are not available, it is also used to
calculate power quantities and is used as a phase angle reference.
When the IO_C module, located in slot C, senses an interruption to its auxiliary supply, it
raises an AC Low Aux Voltage Inhibit, and forces the input state of the contact inputs to
OFF, as the interruption prevents sensing the actual states.
The two contact outputs can be programmed to follow any one of the digital signals
developed by the MM300, such as alarms and status signals. The exception is that the
contactor A relay is fixed as the first contact output, and contactor B relay is fixed as the
second contact output (where used).
Connect AUX VT to the Control Supply for correct operation of the UV Restart feature and
readings of inputs.
All IO_C cards must have the auxiliary input VT wired for proper input sensing. If the
auxiliary voltage on any IO-C module is too low, the contact inputs states for the affected
module will be forced to OFF.
Substitute the slot position of the input/output module (C, E, F, G, H) wherever the tilde
symbol "~" appears in the diagrams above.