ABB Q951 User Manual page 33

A51 Supply control unit
A61 Emergency stop safety relay with delay contacts
A641 Main monitoring relay for the push buttons
A642 ... A64x Push button monitoring relays
F61 Circuit protection switch
K61 Timer relay
K63 ... K6x Safety relays
Qx Main contactor/breaker
Q4 Charging contactor
R1, R2 Push button resistors
S61 Emergency stop button (option +G331)
S62 Emergency stop reset button with indicator light
T01 Supply unit
T11 ... Txx Inverter units which contain inverter module(s)
T11.x Inverter module
T61 24 V power supply
1) Relay contact for the push button fault indication signal (for user-defined use). If there is a
fault in a push button circuit, the main monitoring relay opens the relay contact.
2) Fault signal connection between main monitoring relay and push button monitoring relays
3) User-defined push buttons
4) Connection to other inverter control units
5) Connection to parallel inverter modules (if any)
6) Main circuit
Step Operation
Initial status: The drive is in operation and the motors are running.
1 The user pushes the emergency stop button [S61] or a user-defined push button. This activates the
emergency stop function.
2 The emergency stop safety relay [A61] de-energizes the digital input on the inverter unit control units
[A41]. This gives the emergency stop command to the inverter units.
The break delay counter of the emergency stop safety relay [A61] starts (user-adjustable delay).
3 Each inverter unit acknowledges the reception of the emergency stop command by energizing the relay
outputs (RO1) on the inverter control units [A41].
The relay output (RO1) of the inverter control unit [A41] energizes the timer relay [K61], resetting its
break delay counter. The relay keeps its delayed break contact closed.
Note: If an inverter unit does not acknowledge the reception of the emergency stop command in 2
seconds, the main contactor/breaker [Qx] opens and the system is tripped.
4 The inverter units decelerate the motors to zero speed in the emergency stop deceleration time (user-
defined parameter).
5 The break delay counter of the emergency stop safety relay [A61] trips and the delay contact de-ener-
gizes safety relays [K65] and [K66].
Safety relay [K66] de-energizes the DIIL input on supply control unit [A51]. This gives the emergency
stop command to the supply unit.
Safety relay [K65] opens the main contactor/breaker [Qx], which disconnects the power supply from
the supply unit [T01].
The charging contactor [Q4] is opened, if the emergency stop is activated during charging.
Description of option +Q952+Q984 33