Watlow EZ-ZONE
®
PMI Controller • 38 • Chapter 2 Install and Wire
Warning:
ç
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.
Note:
Maximum wire size termination
and torque rating:
• 0.0507 to 3.30 mm
2
(30 to 12
AWG) single-wire termination
or two 1.31 mm
2
(16 AWG)
• 0.56 Nm (5.0 in-lb.) torque
Note:
Adjacent terminals may be la-
beled differently, depending on
the model number
.
Note:
To prevent damage to the con-
troller, do not connect wires to
unused terminals.
Note:
Maintain electrical isolation
between digital input-outputs,
switched dc/open collector
outputs and process outputs to
prevent ground loops.
Note:
This equipment is suitable for
use in CLASS I, DIVISION 2,
Groups A, B, C and D or Non-
Hazardous locations only. Tem-
perature Code T4
Warning:
ç
Explosion Hazard – Substitution
of component may impair suit-
ability for
CLASS I, DIVISION 2.
Warning:
ç
Explosion Hazard - Do not dis-
connect while the circuit is live
or unless the area is known to be
free of ignitable concentrations
of flammable substances.
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical relay,
solid state relay or open collector
output options requires use of an
R.C. suppressor.
Switched DC Wiring Example Using DO 7-12
Internal Supply
Note:
As a switched DC output; this output is a constant current out-
put delivering 750mW, current limited to 400mA. The internal
supply does have a maximum open circuit voltage of 22VÎ
(dc) and minimum open circuit voltage of 19VÎ (dc). Pin Z7 is
shared to all digital outputs. This type of output is meant to
drive solid state relays, not mechanical relays.
As an open collector output, use an external power supply with
the negative wired to B7, the positive to the coil of a pilot me-
chanical relay and the other side of the coil wired to D_. Each
open collector output can sink 1.5A with the total for all open
collector outputs not exceeding 8A. Ensure that a kickback di-
ode is reversed wired across the relay coil to prevent damage
to the internal transistor.
Open Collector Wiring Example Using DO 7-12
Internal Supply
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