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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 control unit [A41].
This gives the emergency stop command to the inverter unit.
The emergency stop safety relay [A61] de-energizes safety relays [K65] and [K66].
Safety relay [K66] de-energizes the DIIL input of the 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.
3
The emergency stop reset button indicator light [S62] comes on.
4
The motors coast to a stop.
5
Normal operation resumes after the user:
•releases the emergency stop button [S61] or the user-defined push button to normal (up) position
•pushes the emergency stop reset button [S62] to reset the emergency stop circuit
•closes the main contactor/breaker [Qx]
•makes sure that the inverter units receive the start signals (depends on the configuration, see the
firmware manual).
Fault reaction function
Definition: A safety function requires a "fault reaction function" that tries to initiate a safe
state if it detects a failure in the safety system.
The fault reaction function of the emergency stop safety relay trips the system, if it detects
a failure in the primary safety circuit (emergency stop button [S61] and its connections). A
failure can be, for example, an open circuit. A line fault in a push button monitoring circuit
does not cause the fault reaction function to activate.
If a fault is detected, the fault reaction function:
• activates the emergency stop command
• activates the inverter unit STO function (not applicable to ACS880 multidrives)
• opens the main contactor/breaker
• keeps the safe state activated and the emergency stop reset button indicator light on
until the fault is repaired and the safety function is reset.
Description of option +Q951+Q984 23
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