Instruction Manual

Watlow EZ-ZONE
®
PM Limit Controller • 23 • 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 be-
tween Analog Input 1, Digital I/O,
Switched dc/open collector outputs
and Process outputs to prevent
ground loops.
Note:
The control output common
terminal and the digital common
terminal are referenced to different
voltages and must remain isolated.
Output 2 Mechanical Relay, Form A
Mechanical Relay
(Output 2)
common
normally open
L1
K1
J1
L2
K2
T1
S1
R1
Slot A
• 5Aat240VÅ(ac)or30VÎ (dc)
maximum resistive load
• 20mAat24Vminimumload
• 125VApilotduty@120/240VÅ
(ac), 25 VA at 24VÅ (ac)
• 100,000cyclesatratedload
• Outputdoesnotsupplypower.
• forusewithacordc
See Quencharc note.
PM _ _ _ _ [J]-_ _ _ _ AAA
L
_
K
_
Output 3 Switched DC/Open Collector
dc +
common
X3
W3
Y3
L4
K4
T2
S2
R2
Slot B
dc - (open collector)
Switched DC
• 30mAdcmaximumsupply
current
• shortcircuitlimitedto<50mA
• 22to32VÎ (dc) open circuit
voltage
• Usedc-anddc+todriveexter-
nal solid-state relay.
• DIN-A-MITEcompatible
• Single-pole:upto4inparallel
or 4 in series
• 2-pole:upto2inparallelor2
in series
• 3-pole:upto2inseries
Open Collector
• 100mAmaximumoutputcur-
rent sink
• 30VÎ (dc) maximum supply
voltage
• Anyswitcheddcoutputcanuse
the common terminal.
• Useanexternalpowersupply
to control a dc load, with the
load positive to the positive
of the power supply, the load
negative to the open collector
and common to the power sup-
ply negative.
See Quencharc note.
PM _ _ _ _ _-_ _ [C] _ AAA
Switched DC
common
24V
X
_
dc +
dc -
W
_
Y
_
Open Collector
Load
Power Supply
dc -
common
24V
X
_
W
_
Y
_
Output 3 Mechanical Relay, Form C
Mechanical Relay
(Output 3)
normally open
normally closed
common
L3
K3
J3
L4
K4
T2
S2
R2
Slot B
• 5Aat240VÅ(ac)or30VÎ (dc)
maximum resistive load
• 20mAat24Vminimumload
• 125VApilotdutyat120/240VÅ
(ac), 25 VA at 24VÅ (ac)
• 100,000cyclesatratedload
• Outputdoesnotsupplypower.
• forusewithacordc
See Quencharc note.
PM _ _ _ _ _-_ _ [E] _ AAA
normally open
common
normally closed
L
_
K
_
J
_
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. sup-
pressor.