Pilz PSS 3075-3 Series, Manual

Page: 53 / 98

Operating Manual: PSS 3075-3 Series 7-3
- If there are potential sources of interference, screened cables will be
required for connecting alarm signals to the alarm inputs (DIF) and, if
the alarm inputs are pulsed, for supplying the test pulses. If necessary,
the supply to the system can be buffered.
- When switching inductive loads, suppression should not be used to
protect the semiconductor outputs. Errors may occur if suppression
cannot be avoided (e.g. on contactors with integral suppression),
particulary with RC elements, depending on their capacitive share.
Errors will be shown on the PSS display; the PSS will switch to a safe
condition.
- Minimum range for cable cross sections on field connection terminals in
mm
2
:
¤ Digital inputs: 0.5 (AWG20) ... 1.5 (AWG16)
¤ Digital outputs 0.5 (AWG20) ... 1.5 (AWG16)
¤ Test pulse outputs: 0.5 (AWG20) ... 1.5 (AWG16)
¤ Functional earth: 2.5 (AWG12)
- If you use a multi-strand cable with a cross section of 1.5 mm
2
to
connect the I/Os, you will need to use ferrules conforming to Parts 1
and 2 of DIN 46228, 0.5 ... 1.5 mm
2 , Form A or C. To crimp the ferrules
you can use crimp pliers (crimp form A or C) conforming to EN 60947-
1, such as the PZ 1.5 or PZ 6.5 from Weidmüller, for example.
- Use copper wiring.
- The torque setting on the terminals should be 0.5 … 0.6 Nm.
NOTICE
Please read the description that accompanies the connection
examples! The connection examples can be found on the following
pages.
The terms “signal inputs with frequent operation” and “single-channel safe
input devices” are used in the connection examples. These terms are
defined as follows:
• Signal inputs with frequent operation are signals that change status on
several occasions within a period of time.
• Single-channel safe input devices are positively-driven, normally-closed
contacts which open on actuation (failsafe principle).