Setting Pan/Tilt Belt Tension - PRG BAD Boy Field Service Manual

Setting Pan/Tilt Belt Tension

Loose pan/tilt drive belts can create calibration problems. When the luminaire reaches the end of
travel, excess belt slack can produce a vibration causing the encoder to continue producing a
movement output signal to the processor (even though the luminaire is at its stop).
When properly set, the belt should not show bilateral deflection. Bilateral deflection may be observed
by loosening the tension adjustment screw and rotating the head assembly. As the head is rotated back
and forth, tension is created on one side and deflections are created on the other.
There are two ways to set proper belt tension:
1) Using a Belt Tension Meter (recommended).
2) By manually tightening until no bilateral deflection is present.
When using a Belt Tension Meter, it will be necessary to program separate presets for the Pan and Tilt
Drive belts as follows:
Preset Mechanism
1
2
Tools and Supplies:
T-Wrench, 7/16" Allen
Belt Tension Meter (if available)
CAUTION: Do not overtighten belt, pulley will break and/or bearings will fail.
To set belt tension using a meter:
Step 1. Set Pan and Tilt presets on the Tension Meter as given above.
Step 2. Orient head as shown in
Step 3. Slowly tighten belt adjustment screw. Use Tension Meter to verify correct tension.
0 2. 9 8 1 2. 0 0 05
Width
Mass
(mm)
Pan Drive 4.1
Tilt Drive 4.1
Figure 3-41
M : R
AINTENANCE EMOVE AND
Span Tension
(mm) (lbs.)
15 109 80-100
15 326 80-100
on next page.
R P
EPLACE ROCEDURES
3
81