CHAPTER 2. INSTALLATION 27
Change over the Direction Request and confirm that the motor
behaves correctly when indexed in the reverse direction.
If the Slow speed is to be used, arrange to call up the Slow input and
adjust the rate by means of RV1. The setting will clearly depend on
the purpose for which the slow speed is required, but it must be
slower than the Home speed assuming that the latter has been set
up as suggested near the top of the start/stop range.
Adjustment Without
an Indexer
Turn preset controls RV1, RV2 & RV3 fully anticlockwise, RV4 &
RV5 fully clockwise. Arrange to run the motor at the Home speed in
a periodic fashion so that the behaviour both starting and stopping
may be observed. Slowly turn the Home speed preset RV2
clockwise until stalling occurs either on starting or stopping, indicated
by the motor failing to start or skidding on after stopping. The latter
condition is accompanied by a change in the sound from the motor
when it comes to rest.
The point where stalling is about to occur represents the upper limit
of the Home speed, so to allow a safety margin the control should be
turned back about 1 turn. Reduce this speed by about 50% if
instantaneous reversal is required without loss of synchronism.
Arrange to run the motor continuously at the Fast speed. Slowly
rotate the Fast speed preset RV3 clockwise until the motor stalls.
Turn the control back by not less than 1 turn to give a working
margin.
Periodically apply the Fast speed input and slowly rotate the
Acceleration Rate preset RV4 anticlockwise until the motor stalls
during acceleration. Turn the control back about 1 turn. Continue to
apply the Fast speed input periodically and slowly rotate the
Deceleration Rate preset RV5 anticlockwise until the motor skids on
during deceleration. Turn the control back about 1 turn from this
point.
If the Slow speed is to be used, arrange to call up the Slow input and
adjust the rate by means of RV1. The setting should be slower than
the Home speed to ensure that stalling does not occur.
Change over the Direction Request and test the motor at all speeds
in the reverse direction.
RC9 Ramped Clock
Adjustment of
Acceleration
Characteristic
The ramped clock is normally set up to have an acceleration
characteristic which is almost exponential. Such a characteristic is
suitable for most applications since at high speeds the available
accelerating torque is less than at low speed. This is a result of both
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