Operation - ABB ACS800 Series Hardware Manual

56

Operation

The category 1 emergency stop, i.e. controlled emergency stop, operates as follows.
ACS800 application program receives "EM
STOP BY RAMP" command from RDIO and
gives an acknowledgement signal to relay K21
via relay output RO1 of the RDIO module.
The drive decelerates the motor according
The contacts of tripping time relays K22
and K23 open after the preset time (set >
Line contactor or air circuit breaker opens.
Category 1 emergency stop for ACS800-07/17/37 (+Q952, R6i, R7i, n×R8i)
User presses the emergency
stop push-button.
Relay A21 de-energises and
deactivates relays K21, K22, K23
and digital input DI2 of the RDIO
module.
RO1 of RDIO energised within
2 seconds?
YES (
Relay K21 keeps energised.
to a preset ramp time (par. 22.07).
Motor comes to a standstill.
ramp time of par. 22.07) has elapsed.
A22 de-energises.
RDIO-01 = digital I/O extension module
A21 = safety relay
A22 = safety relay
K21 = feedback response time relay
K22 and K23 = tripping time relays
NO (no acknowledgement signal via RDIO)
acknowledgement signal via RDIO)
Line contactor or air circuit breaker opens.
Relay K21 de-energises.
A22 de-energises.
Motor coasts to stop.