NORSTAT Safety Relays - Handbuch (Seite 80)

application guide safety relays from riese electronic
page 76
b) SAFE Z.2
Connection plan
Two hand control relays SAFE Z.2 according to
BG,
section iron and metal III ZH 1/456 (o2.78) and
DIN EN 574 (02.97) for type I - III c.
Suitable up to category 4; SIL3; PLe reachable
After supply voltage be applied to terminals
A1 and A2, the SAFE Z.2 will be ready for
operation. The power LED illuminates. If the
button S1 is pressed and within 0,5 sec. the
button S2 also pressed, the outputs 13-14,
23-24 are closed and 31-32 will be opened.
The machine will be started. The PLC-output
is connected with 24 V suppl voltage. If one or
both buttons are released, the outputs 13-14
and 23-24 opens immediately. Only after
releasing of both buttons S1 and S2, a new
cycle can be started. The output 31-32 closed.
If the time for pressing the buttons S1 and S2
will be longer as 0,5 sec., the outputs was not
released. The outputs 13-14 and 23-24 keeps
open. The machine cannot be started. On the
terminals S21 and Y2 can be connected
machinereleasecircuit (repeating contactor
control).
*control loop or bridge
32
S21
14 24
S11 S12
A2
M (N)
S22
23
Y1
A1 13
L+ (L)
34
S2 S1
31
Y2
*
K ext
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