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2.1.1 Safe Pulse Block
With the aid of an additional DC/DC converter, the Safe Pulse Block generates the supply voltage for
the drivers. For this, the "Safe Pulse Block" must be provided with two 24 V voltages. This must be
provided as follows:
•
2 x 24 V via contacts VIS1_24V and VIS2_24V with common reference potential VIS12_0V
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If these 24 V voltages are switched off, the DC/DC converter does not transmit any power to the
drivers. As the drivers are now no longer supplied with power, no pulses reach the semiconductor
switches (T1 to T6) of the inverter. The flow of current in the semiconductor switches and in the motor
is interrupted. I.e. after a certain response time of the electronics and the reduction of the motor
current, the motor does not develop a driving torque.
Switch-off of the 24 V voltages must be performed by a fail-safe switching device.
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.
The Safe Pulse Block can 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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2.1.2 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. It interrupts the
control signals to the driver or provides a pulse pattern which shuts down the connected motor in a
controlled manner.
The Safety Digital Input can be parameterised with the following functions:
•
Voltage disable
The micro-controller interrupts the control signals to the driver. 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.
The Safety Digital Input has a separate reference potential VISD_0V. I.e. in this case this reference
potential can be disconnected to trigger the Safety Digital Input. Preferably, the VISD_24V contact is
disconnected.
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BU 0830 en-4121
2 Function description
13
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