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A412.X
Digital I/O extension module
A641
Main monitoring relay for the push buttons
A642 ... A64x
Push button monitoring relay
K61
Timer relay
K62.1 ... K62.3
Safety relays
Qx
Main contactor/breaker
R1, R2
Push button resistors
S61
Emergency stop button
S62
Emergency stop reset button with indicator light
T01
Supply unit
T11
Inverter unit which contains inverter module(s)
T11.x
Inverter module
X969
STO terminal block
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 parallel inverter modules (if any)
5)
Main circuit
Step
Operation
Initial status: The drive is in operation and the motor is 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 digital I/O extension
module [A412.X] of the inverter unit. This gives the emergency stop command to the inverter unit.
The emergency stop safety relay [A61] de-energizes the timer relay [K61].
The break delay counter of the emergency stop safety relay [A61] starts (user-adjustable delay).
The break delay counter of the timer relay [K61] starts (non-user-adjustable delay).
3
The inverter unit acknowledges the reception of the emergency stop command by energizing the relay
output (X65) of the digital I/O extension module [A412.X].
The relay output (X65) of the extension module [A412.X] energizes the timer relay [K61], resetting
its break delay counter. The relay keeps its delayed break contact closed.
Note: If the drive 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 drive decelerates the motor to zero speed in 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-en-
ergizes safety relays [K62.1 ... K62.3].
Safety relay [K62.3] de-energizes the XSTO inputs IN1 and IN2 of the inverter control unit [A41]. This
activates the inverter unit Safe torque off function.
Safety relay [K62.2] de-energizes the DIIL input of the supply control unit [A51]. This gives the
emergency stop command to the supply unit.
Safety relay [K62.1] opens the main contactor/breaker [Qx], which disconnects the power supply from
the supply unit [T01].
6
The contact of the safety relay [K62.2] energizes the emergency stop reset button indicator light [S62].
Description of option +Q952+Q984 29
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