28
10.5 Response (RESP) - This trimpot determines the
dynamic response of the control. The factory
setting is approximately 50% of full rotation. The
setting may be increased if a faster response is
required. See Figure 24.
Note: If response is made too fast, unstable
operation may result.
10.6 Deadband (DB) - The DB trimpot sets the amount
of Main Speed Potentiometer rotation required to
initiate control voltage output. The DB Trimpot is
factory set to 0%. See Figures 25A and 25B.
FIGURE 25A –
DEADBAND TRIMPOT
POSITION
FIGURE 25B –
DEADBAND TRIMPOT ADJUSTMENT
(%) SPEED
b
-100
-100
b
a
100
100
a
Curve (a): No Deadband
Curve (b): Max. Deadband
The DB trimpot also determines the amount of delay that will occur before regeneration
starts. (Regeneration occurs when the applied load torque is in the same direction as the
motor rotation).
To readjust the DB to factory setting:
a. Set Main Speed pot to zero speed position.
b. Set DB trimpot to full CCW position.
c. Adjust DB trimpot CW until motor hum is eliminated.
Note: If the deadband trimpot is set too low (CCW direction), the motor may oscillate
between forward and reverse. Adjust deadband trimpot CW until the instability
disappears. (Oscillation may also occur due to response setting). See Sections
10.5 and 10.6.
FIGURE 24 –RESPONSE
TRIMPOT POSITION
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