Deceleration:
(RV4) The pot marked
D
is the deceleration control. Functionally,
it is the opposite of acceleration, except that it is a more critical
setting
,
in that our machine logic requires that we decelerate from
speed 2 to speed 1 during the course of the final revolution of the
turntable/tower before shutoff.
For an initial setting, start with the
D
pot set fully CCW. Then, cycling the
machine; observe the transition to jog speed at the end of the cycle, prior to the stop
of the turntable/tower at the home position. Gradually increase the
D
pot setting
(CW) until the turntable/tower only jogs approximately 1/8 to 1/4 revolution before
reaching home position. CW adjustment of this potentiometer quickens the stop
and shortens the deceleration time required for the turntable/tower to settle to its
preset jog speed. CCW softens the stop and lengthens the time required for the
turntable/tower to settle to its preset jog speed.
Thus, the deceleration control is important in that if the deceleration time is too
short, we will prematurely reach jog speed and jog an excessive amount of time to
the home position before shutoff.
Conversely, if the deceleration time is set too long, the turntable/tower will not
settle to the jog speed and thus will be going too fast to align properly and the
momentum will take the turntable/tower beyond the start position. As you can
imagine, any time the wrap speed is changed, you will need to make a
corresponding change in the setting of the pot marked
D
(for deceleration).
Note:
The 850DM requires a jumper from the
W
pin to the
CW
pin for speed 2 to
operate.
TROUBLE SHOOTING & REPAIR
In most cases, repair will require parts replacement. If user intends to, and is
equipped to perform repairs, spare parts are available from Orion Parts & Service.
Damage is usually visually evident on the 850M board. Replacing the obviously
damaged board frequently restores operation. However, if damage is not evidently
visible, swapping boards will determine if the board is at fault.
