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Wiring the Series 93
The Series 93 wiring is illustrated by model number option.
Check the unit sticker on the controller and compare your model
number to those shown here and also the model number break-
down in the Appendix of this manual.
All outputs are referenced to a de-energized state. The final
wiring figure is a typical system example.
When you apply power without sensor inputs on the terminal
strip, the Series 93 displays [----] in the upper display, and
[```0] in the lower display, except for 0-5VÎ (dc) or 4-20mA
process input units. Press the ˆInfinity key twice, and [ER`7]
is displayed for one second. This error indicates an open sensor
or an analog-to-digital error. All wiring and fusing must con-
form to the National Electric Code and to any locally applicable
codes as well.
Power Wiring
High Voltage
100 to 240Å (ac), nominal (85 to 264 actual) 93_ _-1_ _ 0 - 00_ _
Low Voltage
12 to 24V‡ (ac/dc) 93_ _- 1_ _ 1 - 00_ _
Figure 2.3 – Power Wiring.
Watlow Series 93 Install and Wire ■ 2.3
Install and Wire
∫
WARNING: To avoid
electric shock, use
National Electric
Code (NEC) safety
practices when
wiring and connect-
ing this unit to a
power source and to
electrical sensors or
peripheral devices.
Failure to do so could
result in injury or
death.
NOTE:
Taking the unit out of
the case is not a nor-
mal operating condi-
tion and should only
be done by a quali-
fied maintenance
installation techni-
cian. Power to the
case should be dis-
connected before
removing or
installing the con-
troller into its case.
∫
WARNING: The case
terminals may still
carry live voltage
when the unit is
removed.
∫
WARNING:
Irreversible damage
will occur if high
voltage is applied to
the low voltage unit.