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110 HVAC Drive H300
Issue Number: 3
With Safe Torque Off there are no single faults in the drive which can
permit the motor to be driven. Therefore it is not necessary to have a
second channel to interrupt the power connection, nor a fault detection
circuit.
It is important to note that a single short-circuit from the Safe Torque Off
input to a DC supply of >5 V could cause the drive to be enabled. This
can be excluded under EN ISO 13849-2 by the use of protected wiring.
The wiring can be protected by either of the following methods:
• By placing the wiring in a segregated cable duct or other enclosure.
or
• By providing the wiring with a grounded shield in a positive-logic
grounded control circuit. The shield is provided to avoid a hazard
from an electrical fault. It may be grounded by any convenient
method; no special EMC precautions are required.
Safe Torque Off over-ride
The drive does not provide any facility to over-ride the Safe Torque Off
function, for example for maintenance purposes.
Safe Torque Off does not provide electrical isolation.
The supply to the drive must be disconnected by an approved
isolation device before gaining access to power connections.
It is essential to observe the maximum permitted voltage of
5 V for a safe low (disabled) state of Safe Torque Off. The
connections to the drive must be arranged so that voltage
drops in the 0V wiring cannot exceed this value under any
loading condition. It is strongly recommended that the Safe
Torque Off circuit be provided with a dedicated 0V conductor
which should be connected to terminal 28 at the drive.
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