Vinten Radamec 435H Pan & Tilt Head - Manual (Page 8)

V V i i n n t t e e n n B B r r o o a a d d c c a a s s t t L L t t d d . .
435H Technical Manual Page 7
4.5. Replacing a Motor / Tacho
Replacing a motor / tacho is very similar for both pan and tilt. In both cases, the back
cover must be removed and the main and base castings separated as described
previously. Note the colour and position of the motor and tacho wires and then un-
solder them from the interference suppression PCB.
The motor / tacho may now be removed together with its mounting plate or bracket
after first removing the four M5 hex socket screws and washers holding it in place.
Note the position of the motor terminals and then separate the motor and its plate or
bracket by removing the four M4 hex. socket screws and washers.
After noting the position, the toothed pulley may be removed from the motor shaft
and fitted to the shaft of the new motor / tacho.
The new motor / tacho may now be fitted to its plate or bracket and replaced in its
position in the base casting of the head. Shorten the motor and tacho wires and
connect them to the interference suppression PCB. In the case of tilt, pay particular
attention to how the wires are tied off on the motor and ensure that the arrangement
on the new motor is identical.
When replacing the pan motor / tacho, fit the belt around the pulley's and adjust the
belt tension by moving the motor / tacho and its mounting plate and lock them in
position by tightening the M5 hex. socket screws holding the plate in position. The tilt
belt cannot be fitted or tensioned until the main and base castings are re-assembled.
This re-assembly is a reversal of the procedure described previously.
With the tilt belt fitted around its pulley's, tensioning is achieved by moving the motor
/ tacho up and down on its bracket and finally tightening the M4 hex. socket screws
which hold it to its bracket. The belt is correctly tensioned when there is
approximately 3mm (pan) or 4mm (tilt) of lateral movement of the belt at the mid
point between the pulleys.
After re-assembly, the head may now be returned to service.
4.6. Replacing an Electro-Magnetic Clutch
When replacing an electromagnetic clutch on a type 435 or type 435H Pan and Tilt
Head, no special gauges are required to set up the clutch gap. However, it is most
important not to remove the spacer collar from its axis - either in pan or tilt. This
collar has been adjusted on assembly to ensure the correct clutch gap is achieved
on it's particular axis.
Having gained access to the head, replacing either a pan or tilt clutch is a very
similar procedure, except that the pan clutch wires must be disconnected from the
clutch drive PCB while the tilt wires must be disconnected from the terminal block. It
should be noted that these wires are not polarised.
Loosen the arm locating the clutch coil, and swing it out of the way. Undo the four
grub-screws (two M5 and two M4) holding the clutch body to the shaft and pull the
complete rotor / coil assembly off the shaft. Remove the clutch armature by undoing
the three slotted screws holding it to the pulley. Do not remove the spacer collar on
the shaft. carefully remove any grub-screw burrs from the shaft with a fine file.
Fit the new clutch armature plate to the pulley with the three slotted screws, or new
ones if provided. Slide the new clutch rotor / coil assembly onto the shaft so that it is