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BLD / MOVFR DOOR OPERATOR VOLTAGE ISSUES
Occasionally a GAL MOVFR door operator will not operate because the output
voltage from the BLD going into the secondary transformer is too high. This
causes the output voltage to exceed the door operator voltage range and the
door operator to fault out. In this case, trimpot “TR” will need to be adjusted to
lower the voltage to the secondary transformer which in turn lowers the output
voltage to the door operator.
The following procedure will allow you to compensate for the voltage
differences in case the voltage cannot be lowered enough using the TR
potentiometer.
1. Determine the voltage output requirement for your job and connect the tap
accordingly. To adjust, see “CHANGING BLD OUTPUT VOLTAGES”:
a. Tap 7 – 240vac
b. Tap 7A – 208vac-220vac
Note: When blue wire is on #7 you cannot lower the voltage down below
240vac. You must move the blue wire to terminal #7A and adjust the voltage up
from 208vac to 220vac (See CHANGING BLD OUTPUT VOLTAGES in
TROUBLESHOOTING section).
2. Turn off main disconnect and start battery lowering.
3. Measure the output of the BLD from Terminal T-PWR Line 3 or 6 to neutral
(N).
4. Adjust the output voltage to the proper range the door operator can run at
by adjusting trimpot “TR” (See picture below).
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