Power Connection - Siemens ULTRAMAT 23 Series Equipment Manual

• The connection lines to the relay outputs, binary inputs, and analog outputs must be
shielded.
• The analog outputs are floating, but have a common negative pole.
• As a measure to suppress sparking across the relay contacts (e.g. limit relays), RC elements
must be connected as shown in the following figure. Note that the RC element results in a
drop-out delay for an inductive component (e.g. solenoid valve). The RC element should be
sized according to the following rule of thumb:
– R = R
– You must use a non-polarized capacitor for the RC element.
Figure 5-2
When operated with direct current, a spark suppression diode can be installed instead of the RC
element.
Connect the signal lines to the Sub-D plugs at the rear of the device.
Refer to the ELAN interface description (Order No. C79000-B5200-C176 German, C79000-
B5276-C176 English) for details on the interface cable.
5.3.2

Power connection

NOTICE
Incorrect power supply
Check before connecting that the existing supply voltage corresponds to that specified on the
label of the device.
Install the power line separately from the signal lines.
A power supply cable or an appliance plug is enclosed with the device, and must only be
connected by qualified personnel (see Qualified Personnel (Page 11)). The cable is connected to
the appliance socket at the rear of the device. At the power supply end, the cable is inserted into
a mains socket.
ULTRAMAT 23
Equipment Manual, 04/2022, A5E37100388-012
/2; C = 4L/R ,
2
L L
where R = 100 Ω and C = 200 nF are sufficient.
Measure to suppress sparks on a relay contact
24 V
R
C
Connecting
5.3 Electrical connection
73