User`s manual

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Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this con-
troller to a power source and to
electrical sensors or peripheral
devices. Failure to do so may re-
sult in damage to equipment and
property, and/or injury or loss of
life.
Spring clamp wiring connector
note:
To insert the wire, push the wire
into the desired connection num-
ber, and it should automatically
lock into place. To remove the
wire, press and hold the orange
release tab with a small screw-
driver. Pull the wire out of the
connection. Solid or tinned wire
recommended.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
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WARNING: Process input may
not have sensor break protec-
tion. Outputs can remain full on.
Check your input settings.
Watlow Series SD ■ 12 ■ Chapter 2 Install and Wire
Figure 12a — Thermocouple Input
(all model numbers)
Thermocouples are polarity sensitive. The negative lead (usually red) must be
connected to terminal 11.
• Input impedance: >20 MΩ
Figure 12b — RTD Input (100 Ω DIN curve 0.00385 Ω/Ω/°C)
(all model numbers)
Terminals 8 and 11 must be shorted for a two-wire RTD. For three-wire RTDs,
the S1 lead (usually white) must be connected to terminal 10.
• Nominal excitation current: 390 µA
Figure 12c — 0 to 10V
ÎÎ
(dc) Process Input
(all model numbers)
• Input impedance 20 kΩ, dc only.
Figure 12d — 0 to 50mV
ÎÎ
(dc) Process Input
(all model numbers)
• Input impedance >20 MΩ, dc only.
4
8
9
10
11
5
6
7
10
11
6
8
9
10 11
10
11
+
-
4
8
9
10
11
5
6
7
9
11
6
8
9
10 11
9
11
+
-
3-wire RTD
6
8
9
10 11
S1 10
S3 11
S2 8
4
8
9
10
11
5
6
7
10
11
8
2-wire RTD
6
8
9
10 11
S1 10
11
S2 8
4
8
9
10
11
5
6
7
10
11
6
8
9
10 11
+10
-11