User Guide

Warning! If possible, do not adjust trimpots with main power

applied. If adjustments are made with main power applied, an insu-

lated adjustment tool must be used and safety glasses must be worn. High

voltage exists in this control. Fire and/or electrocution can result if caution is

not exercised. Safety Warning, on page 5, must be read and understood

before proceeding.

A. Maximum Speed (MAX) –

Sets the maxi-

mum speed of the motor. The MAX trimpot

is factory set for 100% of base motor speed.

For a higher maximum speed setting, rotate

the MAX trimpot clockwise. For a lower

maximum speed setting, rotate the MAX

trimpot counterclockwise. See Figure 11.

To Calibrate the MAX Trimpot:

1. Adjust the MAX trimpot to the desired

position and set the Main Speed

Potentiometer for full output voltage.

2. Monitor the armature voltage and readjust the

MAX trimpot to the desired voltage.

B. Minimum Speed (MIN) – Sets the minimum speed

of the motor. The MIN trimpot is factory set for 0%

of base motor speed. For a higher minimum speed

setting, rotate the MIN trimpot clockwise. See

Figure 12.

110

120

150

PERCENT OF BASE SPEED FOR SCR RATED MOTORS

100

(SHOWN FACTORY SET TO 100%)

FIGURE 11 – MAX

TRIMPOT RANGE

522

PERCENT OF BASE SPEED

(SHOWN FACTORY SET TO 0%)

FIGURE 12 – MIN

TRIMPOT RANGE