Owner manual

Watlow EZ-ZONE
®
PM Integrated Controller • 30 • Chapter 2 Install and Wire
Warning: Óç
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 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)
• 0.8 Nm (7.0 lb.-in.) torque
Note:
Adjacent terminals may be labeled
differently, depending on the model
number.
Note:
To prevent damage to the control-
ler, do not connect wires to unused
terminals.
Note:
Maintain electrical isolation between
analog input 1, digital input-outputs,
switched dc/open collector outputs
and process outputs to prevent
ground loops.
Note:
The control output common termi-
nal and the digital common terminal
are referenced to different voltages
and must remain isolated.
Note:
This Equipment is suitable for use in
CLASS I, DIVISION 2, Groups A, B,
C and D or Non-Hazardous locations
only. Temperature Code T4A
Warning:
ç
Explosion Hazard - Dry contact clo-
sure Digital Inputs shall not be used
in Class I Division 2 Hazardous Loca-
tions unless switch used is approved
for this application.
Warning:
ç
Explosion Hazard – Substitution of
component may impair suitability
for CLASS I, DIVISION 2.
Warning:
ç
Explosion Hazard - Do not discon-
nect while the circuit is live or
unless the area is known to be free
of ignitable concentrations of flam-
mable substances.
Note:
As a switched DC output; this output is a constant current output delivering
750 mW, current limited to 400 mA. The internal supply does have a maxi-
mum open circuit voltage of 22 VDC and minimum open circuit voltage of
19 VDC. 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 mechanical relay and the other
side of the coil wired to D_. Each open collector output can sink 1.5 A with
the total for all open collector outputs not exceeding 8 amperes. Ensure that
a kickback diode is reversed wired across the relay coil to prevent damage
to the internal transistor.
Open Collector Wiring Example Using DO 7-12
Internal Supply
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.