Watlow Series F4S/D - Manual (Page 124)

1 2 . 2 ■ W i r i n g Wa t l o w S e r i e s F 4 S / D
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WARNING:
Provide a labeled switch
or circuit breaker
connected to the Series
F4 power wiring as the
means of disconnection
for servicing. Failure to
do so could result in
damage to equipment
and/or property, and/or
injury or death to
personnel.
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WARNING:
To avoid damage to
property and equipment,
and/or injury of loss of
life, use National Electric
Code (NEC) standard
wiring practices to install
and operate the Series
F4. Failure to do so could
result in such damage,
and/or injury or death.
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CAUTION:
Maintain isolation
between analog inputs 2
and 3, and between
analog input 1 and digital
inputs 1 to 4 to prevent a
ground loop. A ground
loop may cause incorrect
readings. Failure to
follow this guideline
could result in damage to
equipment and product.
Power Wiring
Use only number 14, AWG copper conductor rated for at least 60 °C .
100 to 240V‡ (ac/dc), nominal (85 to 264 actual) F4 _ H - _ _ _ _ - _ _ _ _
The Series F4 has a non-operator-replaceable fuse Type T (time-lag)
rated at 2.0 or 5.0A @ 250V.
Figure 12.2 — Power wiring.
Sensor Installation Guidelines
Thermocouple inputs: Extension wire for thermocouples must be of
the same alloy as the thermocouple to limit errors.
If a grounded thermocouple is required for input 2, the signal to input 3
must be isolated to prevent possible ground loops.
RTD input: Each 1 of lead wire resistance can cause a +2°F error when
using a two-wire RTD. A three-wire RTD sensor overcomes this problem.
All three wires must have the same electrical resistance (i.e., same
gauge, same length, multi-stranded or solid, same metal).
Process input: Isolation must be maintained between input 2 and
input 3. If both input 2 and input 3 are process signals, a separate power
supply and transmitter must be used for each input. These inputs must
be electrically isolated from one another to prevent ground loops.