Rockwell Automation 1901 SyncPro - Manual (Page 23)

Installation 3-5
1901-UM020C-EN-P – June 2013
In both cases, the RUN output will follow the state of the START
input, provided that all starting conditions are met. Note that in all
cases, stopping the motor is done via the hardwired control circuit
logic, and notification only is given to the SyncPro™.
Figure 3.4 shows a typical two-wire control circuit. The selector
switch is used to control the NOT STOP and the START as a pair.
It is also used to ensure the motor is stopped via the hardwired
control circuit logic, (even though in this case the RUN output will
be removed when the selector switch is turned off).
The ESR circuit ensures the motor is stopped for any fault condition
occurring either externally or when detected by the SyncPro. Once
the ESR has dropped out (detected by the loss of I:4/07), the
selector switch must be switched off and on to initiate a start. This
prevents a premature start if the fault condition is cleared and the
selector switch is still in the run position.
Figure 3.5 shows a typical three-wire control circuit. The STOP
PB must be maintained high in order to initiate a start and to run
the system. The button also ensures that the motor is stopped via
the hardware circuit. The momentary START PB is used to create
a RUN (START) output signal of the same duration as the input
signal as long as there are no faults detected by the SyncPro.
I:4/00 NOT STOP
I:4/01 START
O:3/06 RUN CR
ESR
E-STOP O/L
O:3/01 TRIP ESR
External
I:4/07 EQUIP
SHUTDOWN
CR
START PB
STOP PB
I:4/00 NOT STOP
I:4/01 START
O:3/06 RUN CR
ESR
E-STOP O/L
O:3/01 TRIP ESR
External
I:4/07 EQUIP
SHUTDOWN
CR
START PB
STOP PB
Figure 3.5 – Three-Wire Control