Datasheet

Relays for functional safety
Safety relays PNOZsigma
PNOZ s50
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
898
Both poles are switched (e.g. O1+, O1-).
O3
Fig.: Start-up condition for inputs Y10/Y11
After the output O1+/O1- and/or O2+/O2- is switched on, the voltage U
B1B2
is available for a
configurable overexcitation time U
over
. Once the overexcitation time t
over
has elapsed, the
voltage is reduced through pulse width modulation (PWM). The overexcitation time t
over
and
the reduced voltage U
Avg
are configured via the display.
t
over
U
B1B2
U
Avg
Y10, Y11
Y20, Y21
01+, 02+
t
t
t
on
t
off
Fig.: Switching the power circuits on and off
Legend:
} Y10, Y11, Y20, Y21: Safe inputs to switch the outputs O1+, O2+
} O1+, O2+: Safe outputs, power circuit 1 and 2
} U
B1B2
: Supply voltage to the power circuits
} t
on
: Switch on power circuit
} t
over
: Configured overexcitation time
} t
off
: Switch off power circuit
} U
Avg
: Configured reduced voltage (arithmetic mean of the voltage at the outputs once
the overexcitation time has elapsed)
Inputs Y10, Y11 (or Y20, Y21) can be activated via single-pole or dual-pole safe outputs.