Safety Digital Input - Nord Drivesystems SK 500P Series Supplementary Manual

SK 510P, SK 540P
For this, either the VIS_24V or VIS_0V contact may be disconnected from the 24 V voltage source.
Preferably, the VIS_24V contact is disconnected.
SK 530P, SK 550P with SK CU5-STO or SK CU5-MLT
This variant has a dual-channel input circuit. Contacts VIS1_24V and VIS2_24V have a common
reference potential VIS12_0V. This reference potential must not be disconnected if a dual-channel
Safe Pulse Block is used. With this variant, the Safe Pulse Block can also be used with a single
channel. I.e. the two contacts VIS1_24V and VIS2_24V are connected in parallel.
In this case, both the 24 V voltage as well as the reference potential VIS12_0V can be disconnected.
Preferably, the parallel contacts VIS1_24V and VIS2_24V are separated.
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2.2.2 Safety Digital Input

The Safety Digital Input is explicitly intended for implementing a safety function. This means that the
standard digital inputs must not be used to implement a safety function.
With the Safety Digital Input, safe triggering is carried out using the micro-controller. This interrupts the
control signal to the drivers or provides a pulse pattern which shuts down the connected motor.
The Safety Digital Input can be parameterised with the following functions:
• Disable Voltage
The micro-controller interrupts the control signals to the drivers. No control pulses are provided to the
semiconductor switches (T1 to T6) of the inverter. I.e. the current in the semiconductor switches and in
the motor is interrupted and the motor runs down to a standstill.
• Quick Stop
The micro-controller shuts down the motor with control pulses according to a pre-set quick stop time.
With regard to function, the Safety Digital Input is identical for the two variants of the safe shut-down
method. However, there are differences with regard to the reference potential.
BU 0630 en-2020
2 Function description
13