Connecting The Power Supply; Programming The Transmitter - Gossen MetraWatt SIRAX V 644 Mode D'emploi

Notes
7.1.1 Connection to thermocouples (connection
diagram No. 8)
With instruments programmed for thermocouple connection
with internal cold junction compensation, compensating
leads must be used from the thermocouple to the terminals
of backplane BP 902.
No line balancing is required.
The compensating resistor Ni 100 is plugged onto backplane
BP 902.
7.1.2 Connection to resistance thermometers or
potentiometer
7.1.2.1 Two-wire connection (connection diagram No. 4)
Terminals 1 and 3 must be connected in the case of a two-
wire measurement. The influence of the lead resistance is
compensated automatically by a lead resistance measuring
circuit. This is done by shorting the sensor and pressing the
calibration button S1 (see Fig. 2) for at least 3 seconds. Wait
until the green LED no longer flashes. Remove the short-
circuit from across the sensor.
7.1.2.2 Three-wire connection (connection diagram No. 5)
It is assumed that the three leads of a three-wire connection
have identical resistances and no compensation is necessary.
The lead resistance must not be greater than 30 Ω per lead.
7.1.2.3 Four-wire connection (connection diagram No. 6)
The four-wire measurement is independent of lead resistance
within wide limits and therefore no compensation is necessary.
The lead resistance must not be greater than 30 Ω per lead.
7.2 Measuring output leads
Connect the output leads for output A1 to pins a26 (–) and
a28 (+) and for output A2 (field indicator) to pins a30 (–) and
a32 (+) as shown in Fig. 6.
Note: The maximum permissible external resistance
R max. of the transmitter must not be exceeded (see
ext
Section "5. Technical data").

7.3 Connecting the power supply

Connect the power supply to pins a20 (
shown in Fig. 6.
A two-pole switch must be included in the supply connection
where facility for switching SIRAX V 644 off is desired.
Note: An external supply fuse must be provided for DC
supply voltages < 125 V.
7.4 Connecting the output contact
Connect the output contact signalling leads acc. to Fig. 6
resp. Table 6.
28
Table 6: Output contact K
c27 and c29 are connected in the event of a power supply
failure.

8. Programming the transmitter

A PC, the programming cable PRKAB 600 and the
programming software VC 600 are needed to program the
transmitter.
+
– ~
) and c14 ( ) as
~
Relay Material
c29
Gold flashed
c27
silver alloy
c31
1. It is not permitted to use the programming
cable PRKAB 600 for programming
devices of other manufacture.
2. (This point only applies to the "intrinsically
safe" [EEx ia] IIC version of the SIRAX
V 644 transmitter)
The programming connector (7) is not
electrically insulated from the intrinsically
safe measuring input circuit. It is therefore
essential to observe the following:
– Programming may only be performed
using the programming cable PRKAB 600
(certificate Ex:
PTB 97 ATEX 2082 U).
– The voltage applied to the FCC connector
must not exceed 253 V. For this reason,
no devices may be connected to the input
circuit of the V 644 that have a supply
>253 V. Pay special attention to this when
measuring DC voltages with NLB692
number. Note that in this case the
component certificate is void. We also
recommend that for safety, the Ex symbol
should be crossed out to make it invalid.
– The programming connector (7) may only
be used briefly.
– The plug connector between the socket
connector and the expandable cable (see
arrow on the diagram) must not be
withdrawn when the expandable cable is
connected to the programming instrument.
For this reason, the expandable cable
must be plugged into the socket connector
befor establishing the connection between
the device and the PC.
to PC Socket connector
or Laptop
Contact rating
AC: ≤ 2 A/250 V
(500 VA)
DC: ≤ 1 A, 0.1...250 V
(30 W)
to
SIRAX V 644
Expandable cable