Watlow Series TM - Manual (Page 9)

Wa t l o w S e r i e s C • 7 • C h a p t e r 3 W i r i n g
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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
result in damage to equipment
and property, and/or injury or
loss of life.
Ó
WARNING: If high voltage is ap-
plied to a low-voltage controller,
irreversible damage will occur.
Note: Insulated terminals re-
quired for quick connect style
terminals.
For quick connect terminals 1,
2, 6, 7, 8, 9, and 10, AMP P/N
3-520406-2 or equivalent recom-
mended. Use Amp crimp tool
P/N 58078-3, insert 90391-3.
For quick connect terminals 3, 4,
and 5, AMP P/N 2-520405-2 or
equivalent recommended. Amp
crimp tool P/N 58078-3, insert
58079-3.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when us-
ing a switched DC output. Un-
grounded thermocouples recom-
mended.
Figure 7a — AC Power Wiring
• Nominal voltage options:
- 24V Å (ac)
- 120V Å (ac)
- 230 to 240V Å (ac)
L1
L2
L1
L2
1
2
3
4
5
6
10
9
8
7
Figure 7b — Thermocouple Input
Thermocouples are polarity sensitive. The negative lead (usually red) must be
connected to TC-.
• Input impedance: >10 M
Ω
TC+
TC - Thermocouple -
Thermocouple +
1
2
3
4
5
6
10
9
8
7
Figure 7c — RTD Input
(100
Ω Platinum DIN curve 0.00385 Ω/Ω/°C)
• Terminals S2 and S3 must be shorted for a two-wire RTD
• Nominal excitation current: 125 μA
S2
S1 RTD S1
RTD S2
S3 S3
RTD S1
RTD S2
RTD S3
2-Wire RTD 3-Wire RTD*
*No lead resistance
compensation
1
2
3
4
5
6
10
9
8
7