V6.230 20131017
17
The resistance from the white to black probe leads is 1000 ohms and from white
to red leads is 1000 ohms at 23
C and increases as a function of temperature.
Figures 3.9a and 3.9b show probe connections.
Figure 3.9a: NEMA Connections
Figure 3.9b: Panel Connections
NOTE:
You must use all active temperature probes for proper operation. The unit
will continuously alarm if you fail to set the unused probe channel name to
“none”, use resistors in place of probes, or use all probes.
If a probe is unavailable, you can use two 1,000 ohm resistors. One end of
one resistor to REF, the end of the second resistor to TMP. Tie the loose
end of both resistors to COM.
NEVER HEAT THE PROBE ABOVE 200 ºC.
Probes can be supplied from lengths of 10 feet to 250 feet. When using existing
substation wiring with probe lengths less than 250 feet, it is important to connect
using 3 conductor with overall shield and connect the probe’s shield drain wire to
the shield the cable. The total wiring length can not exceed 250 feet. Also it is
important to ensure that the cable’s shield drain wire is directly attached to the
chassis of the
TTC-1000
as
shown in Figure
3.10.
Figure 3.10:
Temperature
Probe Shield
Grounding
TB1
6
7
8
9
10
11
12
Alarm
Probe 2
Probe 1
TB2
1
2
3
4
5
C
O
M
T
M
P
R
E
F
C
O
M
T
M
P
R
E
F
C
O
M
T
M
P
R
E
F
C
O
M
N
O
N
C
Probe 3
C
O
M
T
M
P
R
E
F
SHIELD
TB2
C
O
M
T
M
P
R
E
F
C
O
M
T
M
P
R
E
F
A
B
RS485
G
N
D
1
2
3
4
IN1
IN2
TB4
Summary of Contents for TTC-1000
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