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J. DC DRIVE SETTINGS
(1) ACCEL/DECEL
The DC drive located inside the operator control box has
separate potentiometers for both ACCEL and DECEL.
These are typically set at the factory but are fi eld
adjustable. Depending upon the size and weight of a
specifi c door, it may be necessary to fi eld adjust the
ACCEL & DECEL to allow for the operator to smoothly
DECEL POTENTIOMETER
ACCEL POTENTIOMETER
RUN SPEED POTENTIOMETER
CREEP SPEED POTENTIOMETER
Figure 4.
ramp up to full run speed and smoothly ramp down to
creep speed (See Figure 4, 5 & 6).
The ACCEL potentiometer controls the acceleration
from 0 to the run speed setting. The minimum ACCEL
setting should be 1 second.
The DECEL potentiometer controls the deceleration rate
The following procedure, presented in order
of adjustment sequence, should be used
when re-adjusting all trimpot functions:
CAUTION!
[PM motors only]. Adjusting the accel
time below .5 seconds increases
inrush current. It may be necessary
to measure the peak inrush current
and consult with motor manufacturer
since field magnet demagnetization
may occur.
Crown Industrial Operators • 213 Michelle Ct. • So. San Francisco, Ca 94080-6202
G-2001
FACTORY SETTING 1 SEC.
RAPID
.2 SEC.
SLOW
10 SEC.
ACCEL
Figure 6.
Phone: (650) 952-5150 • Fax: (650) 873-1495
www.crown-industrial.com Email: autodor@crown-industrial.com
from run speed to creep speed.
To adjust either the ACCEL or DECEL, turn the
potentiometer clockwise to increase the duration of time
to accelerate or decelerate, and counterclockwise to
decrease the time. The setting must take into account
the run speed, weight of the door and the length of the
creep mode. The faster the travel and/or the heavier the
door the longer the transition time should be.
ACCEL POTENTIOMETER
DECEL POTENTIOMETER
Figure 5.
DO NOT ATTEMPT TO ADJUST THE OTHER
POTENTIOMETERS ON THE DC CONTROL BOARD.
THEY ARE FACTORY SET & ADJUSTMENTS WILL
DAMAGE THE UNIT AND VOID THE WARRANTY.
(2) MAXIMUM SPEED - factory set, do not adjust without
consulting factory
(3) MINIMUM SPEED - factory set, do not adjust without
consulting factory
(4) CURRENT LIMIT - factory set, do not adjust without
consulting factory
(5) IR COMPENSATION - factory set, do not adjust
without consulting factory
FACTORY SETTING 1 SEC.
RAPID
.2 SEC.
5 SEC.
SLOW
10 SEC.
8 SEC.
IR COMPENSATION
CURRENT LIMIT
MIN. SPEED
MAX. SPEED
5 SEC.
8 SEC.
DECEL
5
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