Functional Software description
18 DCS 500 Software Description
Stop Control The drive can be stopped in the following ways:
- By opening the Main Contactor:
Controlling [ON/OFF] (901) input to zero state. All contactors
will open and there is no electrical braking. The drive will stop
by coasting (see opening control of the contactors).
This stop mode cannot interrupt Emergency Stop, Stop be-
cause of panel or field bus link problems.
- RUN-command to zero
If all RUN inputs [RUN1] (902), [RUN2] (903) or [RUN3] (904)
are set to zero , the drive will stop.
This stop mode can be interrupted by Emergency Stop, Stop
because of panel or field bus link problems.
Parameter STOP MODE (916) defines how the stop is made:
0 = stop by ramp (DECEL1 (1709) or DECEL2 (1712) ) at
RAMP GENERATOR function block
1 = stop by torque limit (TORQ_MAX / TORQ_MIN)
2 = stop by coasting (torque is zero)
If the drive is stopped and should be restarted, the actual con-
dition of the drive has to be taken into consideration:
-if STARTSEL (1717) = 0 (start from zero):
a. and the actual speed is below MIN_SPEED_L (2201)
the drive accepts the 0 to 1 transition of the RUN com-
mand and will accelerate according to the reference
without handling the ON/OFF signal
b. and the actual speed is above MIN_SPEED_L (2201)
the 0 to 1 transition is ignored as long as the speed is
above this level; if this cannot be accepted because of
any reason (e.g. stop by coasting) both inputs must
have logic 0 level; afterwards, ON/OFF and RUN
should be set to 1 (edge sensitive); the drive will force
the motor to zero speed by the torque limit at first and
afterwards, the drive will accelerate according to the
reference; this behaviour is independant from the se-
lected stop mode
remark: if EMF is selected as a speed feedback signal,
it may happen, that the drive reacts according to a, be-
cause the MIN_SPEED_L is too smal
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