SSD 605C Product Manual - Advanced Stopping Methods
4-10
Operating the Inverter
605C Frequency Inverter
A special case exists when the RAMP DECEL RATE is set to 0.0 seconds, or when the RAMP
HOLD parameter is TRUE. In both these situations the SPEED DEMAND will ramp down to
zero at the STOP RATE.
Coast to Stop
In this mode the RAMP DECEL RATE ramp and the STOP RATE ramp are both ignored. Thus
the SPEED DEMAND changes immediately to 0% as soon as the Stop command is given. The
power stack is also immediately disabled at this time, causing the load to coast.
Advanced Stopping Methods
The Inverter can be selected to /FAST STOP or to /COAST STOP. The stopping procedure is
unaffected by Local or Remote Sequencing options.
Forced Fast Stop
The /Fast Stop mode overrides the RUN FWD, RUN REV and JOG inputs in Remote mode,
and the RUN and JOG Operator Station keys in Local mode. It is selected by setting /FAST
STOP to TRUE.
The Fast Stop mode can be set to either RAMP or COAST. The stopping sequence starts when
the /FAST STOP input goes FALSE, regardless of the state of the RUN input.
SPEED DEMAND
REMOTE SETPOINT
Speed 0%
RUN input
Ramp SPEED DEMAND
to zero at STOP RATE
SPEED TRIM
POWER
CIRCUIT
DISABLED
STOP DELAY
Figure 4-8 Remote to Stop with a Remote Reference: no RAMP DECEL RATE
POWER CIRCUIT DISABLED
SPEED DEMAND
REMOTE SETPOINT
Speed 0%
RUN input
Figure 4-9 Coast to Stop with a Remote Reference
SPEED DEMAND
REMOTE SETPOINT
Speed 0%
Ramp SPEED DEMAND
to
zero at FAST STOP RATE
SPEED TRIM
POWER
CIRCUIT
DISABLED
FAST STOP LIMIT
/FAST STOP
Figure 4-10 Forced Fast Stop RAMP Mode example