Pilz PMCtendo DD5 Operating Manual page 19

Safety
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Integral solid state short circuit protection does not provide branch circuit protection.
Branch circuit protection must be provided in accordance with the National Electrical
Code and any additional local codes.
} These devices are not provided with motor over-temperature sensing.
}
Suitable for use on a circuit capable of delivering not more than 42kA rms symmetrical
amperes for a max. voltage of 480 Vac.
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The drives may be connected together via the "common bus" (DC bus link) based on
the instructions on p. 61ff. The devices may also be grouped from the AC input side
based on the max. input fuse (e.g. 3 pcs. S346 with one common 6A fuse in line).
3.1.5 Safety function STO
The safety function "Safe torque off" (STO) activates the pulse disabler on the servo ampli-
fier and removes the power to the motor. It meets the requirements in accordance with
EN 61800-5-2.
The input STO-ENABLE meets the requirements of EN ISO 13849-1: PL d (Cat. 2) and EN/
IEC 62061: SIL CL 2.
The safety function "safe torque off" corresponds to a category 0 stop (uncontrolled stop) in
accordance with EN 60204-1.
Improper use STO
The safety function STO may not be used when the drive is to be stopped for the following
reasons:
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Cleaning, maintenance and repair work, long interruptions in operation
Remove the voltage from the entire plant and secure it (main switch).
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Switching off the energy supply of the servo amplifier
(see standard EN 60204, emergency switching stop).
Before carrying out any work on the machine, you must comply with the five safety rules in
the order stated:
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Operating Manual PMCtendo DD5
1002236-EN-04
Enable (switch off the voltage.)
Also disconnect the auxiliary circuits.
Secure against reconnection
Verify that the system is dead
Carry out earthing and short circuiting
Provide protection from adjacent live parts.
DANGER!
Risk from rotating motor after STO has been triggered!
The safety function STO switches the motor to torque-free. On motors
without a safe holding brake, moving parts present a threat to life.
Use an additional mechanical measure to block the drives safely (e.g. with
the motor holding brake), particularly with suspended loads.
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