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6
Electrical connection
7
Setting the hot-spot gradient
screw and remove the pressure ring. Push the pressure screw
and gasket over the temperature detector (9.5 mm diame-
ter) and the capillary tube. Thread the temperature detector
40 – 50 cm through the small cable gland connection until
it reaches the stop (at a depth of approx. 215 mm) in the
transformer temperature sensor sleeve of the ZT-F2.1 trans-
former temperature transmitter. Pull the capillary tube until
it is straight and then install it. Then tighten the cable gland
connection until it is liquid-tight.
Push the replacement sensor (Appendix/Fig. 7) into the tem-
perature sensor sleeve of the ZT-F2.1 transformer temperature
transmitter until it reaches the stop (at a depth of approx.
215 mm). Seal off the unused cable gland connection as tightly
as possible.
6 Electrical connection
6.1
Connecting the current transformer
CAUTION
Electrical connections may only be carried out by qualified,
skilled personnel trained in the applicable safety regulati-
ons of the relevant country.
WARNING
Hazardous electrical voltages!
All connecting wiring must be free of voltage before opening
the device.
Connect the current transformer to terminals 1 + 2 of the
ZT-F2.1 transformer temperature transmitter. The rated secon-
dary current should be 1.5 to 2 A. Use a ballast transformer
according the desired hot-spot gradient for other currents.
6.2
Pt100 measuring resistor
The ZT-F2.1 is equipped with a Pt100 measuring resistor con-
forming to IEC 751. The indicator instrument that is used can
be designed as 2, 3 or 4-conductor.
Length of the connection lines
The length of the connection lines depends on the specifica-
tions of the measuring transducer or indicator device to be
connected (e.g., one Pt-MU 100 Ω per line). In general, a line
length of 50 m should not be exceeded if the 3-conductor
technique is used. With the 3 or 4-conductor technique, make
sure that the individual leads are identical (i.e., same length,
same cross section). Otherwise differences may occur due to
incorrect compensation of the line resistors.
3-conductor technique
A 3-conductor indicator instrument (2 measuring lines and
1 compensation line) is to be used. The sensor lines are con-
12
nected to terminals 3 and 4 and the equalizing line to terminal
3a (see figure 3, item 2).
2-conductor technique
When a 2-conductor indicator instrument is used (2 measuring
lines), one measuring line is connected to terminal 3 and the
other measuring line is connected to terminal 4 (see figure 3,
item 2).
4-conductor technique
When a 4-conductor indicator instrument is used (2 measuring
lines and 2 compensation lines), the same connections are used
as for the 3-conductor technique. The second compensation
line must be connected to terminal 4
Option
When the configuration of the ZT-F2.1 with two Pt100 measu-
ring resistors is used, an additional indicator instrument can be
connected to terminals 6, 5a and 5 (see figure 3, item 3).
6.3
Option: Transducer 4...20mA
Fig. 2
The ZT-F2.1 can be delivered with the 4...20mA analog output
instead of the Pt100 measuring resistor. The 2-conductor
connection technique (R/L max. 750 Ω at 24 V DC) is used with
connection to terminals 3a and 3 (see figure 2 and figure 3,
item 2).
Current loop I1 as passive analog output:
The device acts as a controlled resistance which, at a supply
voltage between 10-30 VDC, controls the current flow between
4-20 mA as the measured temperature to be shown
Option
Optional configuration of the ZT-F2.1 with two analog outputs
or one analog output and one measuring resistor is also possi-
ble. Connection is then made to terminals 5a and 5 (see figure
2 and figure 3, item 3).
7
Setting the hot-spot gradient
7.1
Setting for 2A CT nominal current
The hot-spot gradient (at nominal load) is set via the two DIP
switches S1 and S2 located on the ZT.F2.1 board. Determine
(see figure 3, item 2).
BA2526030-07
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