6.6 Voltage Following Connection – An isolated 0 - 9 Volt DC analog
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 isolated
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 kΩ or less. The MAX Trimpot is not operational in
voltage following mode. Use the MIN trimpot to set an initial value
of input signal. If necessary, use auxiliary trimpots 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 SI-6 Signal
Isolator (Part No. 9444). This will also allow direct connections to
process controllers and microprocessors. 2. If multiple follower
motors are to be controlled from a single lead motor or a single
Main Speed Potentiometer, install the optional KBSI-240D Signal
Isolator (Part No. 9431). 3. Terminal “F-” may be used in lieu of Terminal “P1”.