Remote Main Speed Potentiometer Connection - Baldor BC142 Installation And Operation Manual

6.5 Remote Main Speed Potentiometer Connection – The control
is supplied with a Main Speed Potentiometer to control motor
speed. Wire the low side of the potentiometer to Terminal "P1".
Wire the wiper of the potentiometer to Terminal "P2". Wire the
high side of the potentiometer to Terminal "P3". See Figure 3.
6.6 Voltage Following Connection – An isolated 0 - 9 Volt DC ana-
log signal input can be used to control motor speed in lieu of the
Main Speed Potentiometer. The control output voltage will linearly
follow the analog signal input. The signal input must be isolat-
ed from the AC line. Connect the signal input positive lead (+) to
Terminal "P2" and the negative lead (-) to Terminal "P1", as
shown in Figure 4. The source impedance of the signal input
should be 10 k Ω or less. The MAX Trimpot is not operational in
voltage following mode. Turn the MIN Trimpot, on the control, to
zero output (full counterclockwise rotation) and use auxiliary trim-
pots, if necessary, to scale and/or limit the input voltage.
!
CAUTION! Do not earth ground any input terminals.
Notes: 1. If an isolated signal input is not available, or if using a
4 - 20 mA DC signal input, install the optional plug-on Catalog
No. BC152 Signal Isolator. This will also allow direct connections
to process controllers and microprocessors. 2. If multiple follower
motors are to be controlled from a single leader motor or a single
Main Speed Potentiometer, install the optional Catalog No.
BC145 Signal Isolator. 3. Terminal "F-" may be used in lieu of Terminal "P1".
FIGURE 3 – REMOTE MAIN SPEED
POTENTIOMETER CONNECTION
Terminal "P3"
P2
P3
P1
MAX
High
Wiper
Low
Main Speed Potentiometer
(Front View)
FIGURE 4 – VOLTAGE FOLLOWING
CONNECTION
P2
P3
P1
MAX
+
0 - 9 Volts DC
V
(Isolated)
-
Terminal "P2"
Terminal "P1"
Terminal "P2"
Terminal "P1"
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