User Guide

B. Signal Following from
Armature Voltage – Uses
motor armature voltage as a
signal input. If the signal input
voltage applied to the SIMG is
derived from a motor armature
voltage output, it is necessary
to install a 1/4W resistor in
series with the signal lead into
the SIMG. For a 90V DC
motor, install a 150K resistor.
for a 180V DC motor, install a
330K resistor.
C. Unidirectional Potentiometer
Operation (Forward) – Uses a
potentiometer to vary motor speed.
See figure 11A on page 13.
Connect the 5K potentiometer to
TB1 terminals marked “SIG” (wiper
of potentiometer), “+15V” (high side
of potentiometer), and “COM” (low
side of potentiometer). Use the
potentiometer to vary motor speed.
If the motor is not running in the
desired direction, either reconnect
the high side of the potentiometer to TB1 terminal marked “-15V” or reverse the
motor leads.
14
330K
Armature Voltage
Range (VDC)
1/4W Resistor (Ω)
0 – ± 90 150K
0 – ± 180
EN COM SIG -15 +15
J1
TB1
1/4W Resistor
(See Table 3)
Armature
+
-
A
FIGURE 12 – SIGNAL FOLLOWING FROM
ARMATURE VOLTAGE
TABLE 3 – RESISTOR FOR
SIGNAL FOLLOWING FROM
ARMATURE VOLTAGE