4
Operating instructions
Safety switch with interlocking function
AZM 200D
EN
4. Rear side Electrical connection
4.1 General information for electrical connection
The electrical connection may only be carried out by
authorised personnel in a de-energised condition.
The power supply of the safety switch must provide protection against
permanent overvoltage. To that effect, stabilised PELV supply units
must be used. The safety outputs can be directly integrated in the
safety circuit of the control system. For applications up to PL e /
control category 4 to EN ISO 13849-1, the safety outputs Y1 and
Y2 of the safety switch or safety switches must be connected to a
safety-monitoring module of the same control category (refer to wiring
examples). The antivalent switching safety outputs Y3 and Y4 are
suitable for requirements up to PL d / control category 3. To that effect,
the outputs must be connected to a safety-monitoring module meeting
at least the requirements of PL d / control category 3 to EN ISO 13849-
1. The outputs cannot be wired in series.
Inductive loads (e.g. contactors, relays, etc.) are to be provided with
suitable interference suppression circuitry.
Requirements for the connected safety-monitoring module:
• Dual-channel safety input, suitable for 2 or 4 p-type semi-conductor
outputs
Safety outputs Y1, Y2
The safety-monitoring module must tolerate internal functional with
cyclic switch-off of the safety outputs Y1 and Y2 for max. 2 ms (typically
< 1 ms). The switch-off stage of the test cycle is temporarily reduced
by an active ohmic discharge of the cable. The safety-monitoring
module does not need to have a cross-wire short monitoring function, if
necessary, the cross-wire short monitoring function must be disabled.
Safety outputs Y3 and Y4
The safety outputs Y3 and Y4 are antivalent switching outputs.
A short concordance (< 50 ms) must be accepted, as the AZM 200D
might present small switching delays.
Cable
If the cable input is realised through a metric M20 cable gland, this
gland must be dimensioned by the user so as to fit the cable used. A
cable gland with strain relief and suitable IP protection class must be
used.
40
5
The maximum cable length is 200 m (for ST2 M12 connectors approx.
20 m depending on the cable section used for an operating current
of 0.5 A). The maximum cable section is 1.5 mm², incl. conductuor
ferrules. Prior to the connection, the cable must be stripped by 40+5
mm and insulated by 5 mm.
5. Operating principle and diagnostic functions
Magnet control
In the power to unlock version of the AZM 200, the safety switch is
unlocked when the IN signal (= 24V) is set. In the power to lock version
of the AZM 200, the safety switch is locked when the IN signal (= 24 V)
is set.
5.1 Safety switch with diagnostic output
Mode of operation of the safety outputs
The unlocking of the safety switch causes the safety outputs Y3 and Y4
to be disabled. As long as the actuator is inserted in the safety switch,
the unlocked safety guard can be relocked, in which case the safety
outputs will be re-enabled.
The safety guard must not be opened.
Enabling path 1 is depicted by the safety outputs Y1/Y2 of the
AZM 200D. This path switches when the actuator is detected
for applications up to PL e / control category 4.
Enabling path 2 (Y3/Y4) enables (unlocks) both outputs,
when the actuator is detected AND the target is detected
AND the locked condition is detected.
Information for the selection of suitable safety-monitoring
modules can be found in the Schmersal catalogues or in the
online catalogue on the Internet: www.schmersal.net.
Operating principle of the electronic diagnostic output
The short-circuit proof diagnostic output can be used for central
visualisation or control functions, e.g. in a PLC.
The diagnostic output is not a safety-related output!
Error
Errors, which no longer guarantee the function of the safety switch
(internal errors) cause the safety outputs to be disabled. Any error that
does not immediately affect the safe functionality of the safety switch
(e.g. cross-wire short, temperature error, safety output, short circuit to
24 VDC) will lead to a delayed shut-down (refer to table 1).
After fault rectification, the sensor can be reset by opening and
relocking the relevant guard door. The safety outputs enable and allow
a restart. An interlocking chain must be permanently "locked" to enable
the reactivation.
If more than one fault is detected at the safety outputs Y1/Y2,
the AZM 200 will be electronically locked and a normal
fault reset will no longer be possible. To reset this type of
interlocking, the AZM 200, must be isolated from the power
supply after elimination of the error causes.
The safety outputs Y3 and Y4 are not monitored. This task is
assumed by the downstream safety-monitoring module.
To test the outputs, the AZM 200D must be operated at least
once a year (energisation of the IN input). The ambivalence
of the outputs Y3 and Y4 must be tested.
Error warning
A fault has occurred, which causes the safety outputs to be disabled
after 30 minutes. The safety outputs initially remain enabled. This
enables the shutdown of the process in a controlled manner. An error
warning is deleted in the slave when the error cause is eliminated.
