Watlow Series SD31 PID with Optional Countdown Timer - Manual (Page 8)

Wa t l o w S e r i e s S D 3 1
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6
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C h a p t e r 2 I n s t a l l a n d W i r e
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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.
Ó
WARNING: If high voltage is ap-
plied to a low-voltage controller,
irreversible damage will occur.
Wiring the Series SD31
The model number for each output option appears with its wiring dia-
gram. Check the label on the controller and compare your model number to
those shown here and to the model number breakdown in the Appendix of
this manual.
The connectors on the back of the Series SD31 are different for different
model numbers. See page 4. Where two different combinations of connectors
may appear, we show both in the diagrams.
All outputs are referenced to a de-energized state.
All wiring and fusing must conform to the National Electric Code and to
any locally applicable codes as well.
Figure 6a — High Voltage AC Power Wiring
SD31 - H _ _ _ - _ _ _ _ High
• Nominal voltage: 100 to 240V Å (ac)
Figure 6b — Low Voltage AC Power Wiring
SD31 - L _ _ _ - _ _ _ _ Low
• Nominal voltage: 24 ‡ (ac/dc)
• Class 2 power source required for agency compliance
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Isolation Blocks
Electrical isolation exists between each of these blocks.
Relay outputs (mechanical and solid-state) provide isolation through their
relay contacts. Each relay output is isolated from the blocks above and is
isolated from other relay outputs.
Sensor Input
Switched DC Outputs
Analog Process Outputs
Power Supply Input EIA/TIA-485 Communi-
cations Input