Supply control unit
A51
Emergency stop safety relay with delay contacts
A61
Main monitoring relay for the push buttons
A641
Push button monitoring relays
A642 … A64x
Circuit protection switch
F61
Timer relay
K61
Safety relays
K63 … K6x
Main contactor/breaker
Qx
Charging contactor
Q4
Push button resistors
R1, R2
Emergency stop button (G331)
S61
Emergency stop reset button with indicator light
S62
Supply unit
T01
Inverter units which contain inverter module(s)
T11 … Txx
Inverter module
T11.x
24 V power supply
T61
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.
1)
Fault signal connection between main monitoring relay and push button monitoring relays
2)
User-defined push buttons
3)
Connection to other inverter control units
4)
Connection to parallel inverter modules (if any)
5)
Main circuit
6)
Operation
Step
Initial status: The drive is in operation and the motors are running.
The user pushes the emergency stop button [S61] or a user-defined push button. This activates the
emergency stop function.
1
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.
2
The break delay counter of the emergency stop safety relay [A61] starts (user-adjustable delay).
Each inverter unit acknowledges the reception of the emergency stop command by energizing the relay
outputs (RO1) on the inverter control units [A41].
3
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.
The inverter units decelerate the motors to zero speed in the emergency stop deceleration time (user-
defined parameter).
4
The break delay counter of the emergency stop safety relay [A61] trips and the delay contact de-ener-
gizes safety relays [K65] and [K66].
5
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 Q952+Q984 33