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7 - THEORY OF OPERATION
7.14 Hand/Off/Auto Selector Switch
The MX2 has the capability to use a selector switch to change the source of control. A popular use is to switch between using the door
mounted display for Hand operation and using contact input for Auto operation. The following drawing shows how to wire the unit to
allow this operation.
The following parameters have to be programmed into the starter:
P4: Local Source = Terminal
P5: Remote Source = Keypad
P49: DI2 Configuration = Local/Remote
Hand Position
The starter is switched to use the Remote Source via the selector switch which applies 120VAC to digital input 2. The Remote Source is
programmed to Keypad so the keypad becomes active in this switch position.
Off Position
The starter is switched to use the Local Source via the selector switch which removes 120VAC from digital input 2. The Local Source is
programmed to Terminal so the Start digital input becomes active in the switch position. However, the selector switch also disconnects
control power from customer run contact so that 120VAC can not be applied to the Start digital input meaning the starter cannot be given
a start command.
Auto Position
The starter is switched to use the Local Source via the selector switch which removes 120VAC from digital input 2. The Local Source is
programmed to Terminal so the Start digital input becomes active in this switch position. The selector switch also connects control power
to the customer run contact so that a start can be applied.
120VAC LIVE
120VAC NEUTRAL
SELECTOR
SWITCH
OFF
TB2
Figure 47: Example of Start/Stop with a Hand/Off/Auto Selector Switch
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