Watlow SD Series User Manual

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 M

6
8
9
10 11
+10
-11
4
8
9
10
11
5
6
7
10
11
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: 390µA
6
8
9
10 11
S1 10
11
S2 8
2-wire RTD
4
8
9
10
11
5
6
7
10
11
8
6
8
9
10 11
S1 10
S3 11
S2 8
3-wire RTD
Figure 12c — 0 to 10VÎ (dc) Process Input
(all model numbers)
• Input impedance 20 k, dc only.
6
8
9
10 11
9
11
+
-
4
8
9
10
11
5
6
7
9
11
Figure 12d — 0 to 50mVÎ (dc) Process Input
(all model numbers)
• Input impedance >20 M, dc only.
6
8
9
10 11
10
11
+
-
4
8
9
10
11
5
6
7
10
11
ç
Warning:
Use National Electric (NEC)
or other country-specific
standard wiring and safety
practices when wiring and
connecting this controller
to a power source and to
electrical sensors or periph-
eral devices. Failure to do
so may result 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 connec-
tion number, and it should
automatically lock into place.
To remove the wire, press and
hold the orange release tab
with a small screwdriver. Pull
the wire out of the connection.
Solid or tinned wire recom-
mended.
Note: To prevent ground
loops, isolation needs to be
maintained from input to out-
put when using switched DC
or analog process outputs.
ç
WARNING: Process input
may not have sensor break
protection. Outputs can
remain full on. Check your
input settings.

Watlow SD Series Specifications

General

Brand	Watlow
Model	SD Series
Category	Controller
Language	English