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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 elec-
trical sensors or peripheral
devices . Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life .
Note:
Maximum wire size termina-
tion and torque rating:
• 0.0507 to 3.30 mm
2 (30 to
12 AWG) single-wire termi-
nation or two 1 .31 mm2 (16
AWG)
• 0.8 Nm (7.0 lb.-in.) torque
Note:
Adjacent terminals may be
labeled differently, depend-
ing on the model number .
Note:
To prevent damage to the
controller, do not connect
wires to unused terminals .
Note:
Maintain electrical isolation
between analog input 1, digi-
tal input-outputs, switched
dc/open collector outputs and
process outputs to prevent
ground loops .
Note:
The control output common
terminal and the digital com-
mon terminal are referenced
to different voltages and
must remain isolated .
Watlow EZ-ZONE
®
PM PID Controller
•
20
•
Chapter 2 Install and Wire
Quencharc Wiring Example
In this example the Quencharc circuit (Watlow
part# 0804-0147-0000) is used to protect PM
internal circuitry from the counter electro-
magnetic force from the inductive user load
when de-engergized. It is recommended that
this or an equivalent Quencharc be used when
connecting inductive loads to PM outputs.
Quencharc
User Load
L_
K_
N
