SIREC D Display Recorder 7ND4000

CH6 CH5
NO C NC NO C NC
103696MA
G. Linear Inputs - Linear inputs consist of
current inputs (4-20 milliamps or 10 to 50
milliamps) or variable voltage input ranges (+100
millivolts, +1 volt, +10 volt, and normally
open/closed contact inputs). Connect CURRENT
and VOLTAGE inputs as shown in view of Figure
2-7 labeled “VOLTS OR mA”.
NOTE
For current inputs, an external precision resistor
will need to be connected across the
input terminal blocks. An internal resistor is
not available.
NOTE
Signal inputs greater than 10 volts require
the use of an input voltage divider (consult
your local representative or the factory).
2.3.4 Relay Output, Contact Input
(Option) - The Recorder may be equipped
with an optional Digital Input Output Board (Part
No. 5380-316) which has six potential free, Form
C, relay contacts and three opto-isolated digital
inputs.
WARNING
TO PREVENT THE POSSIBILITY OF
ELECTRICAL SHOCK, USE EXTREME
CAUTION WHEN WIRING CONTACT
OUTPUT CONNECTIONS. HAZARDOUS
POTENTIALS MAY EXIST ON CONTACT
OUTPUT TERMINALS WHICH ARE
FLOATING WITH RESPECT TO
INSTRUMENT GROUND. THESE
Siemens AG C79000-G7374-C211-01
SIREC D Manual
R elay O utputs
CH4
NO C NC
CH3
NO C N C
CH2
NO C NC
Figure 2-10 Digital I/O Connections
CH1
N O C N C
Installation and Wiring
INPUT
3 2 1 C
HAZARDOUS POTENTIALS MAY BE
EXPOSED ON THE REAR TERMINAL
PANEL OF YOUR INSTRUMENT. ANY
VOLTAGE POTENTIALS AT THE
CONTACT CIRCUIT WILL EXIST ON THE
INSTRUMENT’S RESPECTIVE CONTACT
OUTPUT TERMINALS; E.G. LINE-
POWERED CIRCUITS.
A. Digital I/O Terminal Block - A terminal
block, as shown in Figure 2-10, is provided for the
six-alarm output, Potential Free, Form C,
connections: normally open (NO), common (C),
and normally closed (NC), and the three digital
inputs which share a common. The relay contacts
are capable of switching 250 V~ at 1 Amp or 30
VDC at 1A.
B. Varistors - The potential-free relay contacts
are protected internally with 300 volt Metal Oxide
Varistors (MOVs) to prevent contact arcing.
C. Inputs - The opto-isolated inputs require an
external potential of 5 to 12 volts DC @ 10
milliamps. The three inputs are isolated from the
unit, but not from each other as they share a
common. The positive voltage connects to the
terminals marked 1,2 or 3 and the common
connects to the terminal marked “C”. It is possible
to use potential free contacts to operate the digital
inputs. This requires opening the unit and setting
jumpers on the relay board. This will remove the
isolation. Contact the factory for details.
The terminal strip is protected by a transparent
acrylic cover held in place by two screws. This
cover protects the user from accidentally touching
terminals that may have hazardous potentials on
them and must be removed before wires can be
connected to the terminals. Loosen the two screws
at either end of the cover and remove them.
Replace the cover once all connections have been
made.
2-7