21
Analog Inputs (Specific Interface Requirements)
The analog input channels consist of differential input amplifiers to allow controllers that
have differential output drivers a three wire connection that excludes potential ground
loops. When differential modes of operation are used, the command or auxiliary input is
based on 5 volts equaling maximum input and the analog ground from the external
controller must be connected to the MPA drives GND connection. A +5 volt connection to
the COM+ terminal and a -5 volt connection to the COM- terminal is equal to a + 10 volts
command voltage. The rotational direction of the motor will be CW viewed from the shaft
end of the motor. To change directional rotation the COM+ and COM- connections must
be reversed.
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3
2
1
CMD
GND
COM–
COM+
–
+
1
2
3
–
+
1
2
3
–
+
1
2
3
GND
–
+
COMMAND
TYPICAL EXTERNAL CONTROLLER
WITH DIFFERENTIAL DRIVERS
MPA AMPLIFIER
I/O AND ANALOG INPUTS
MPA AMPLIFIER
The most typical input to the command and auxiliary inputs is a simple two wire interface
consisting of a command voltage with respect to a GND. The ground wire of this pair
must be connected to the MPA GND terminal associated with the analog channel, and the
command wire can be connected to either the COM+ or COM– input to determine the
rotational characteristic required. A positive command voltage with respect to GND
connected to the COM+ terminal will cause CW rotation as viewed from the shaft end of
the motor. The unused input, COM+ or COM-, should be connected to GND.
14
13
12
11
10
9
8
7
6
5
4
3
2
1
CMD
GND
COM–
COM+
–
+
1
2
3
–
+
1
2
3
GND
–
+
COMMAND
MOST COMMON EXTERNAL CONTROLLER
WITH SINGLE ENDED DRIVER
MPA AMPLIFIER
I/O AND ANALOG INPUTS
MPA AMPLIFIER
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