Ó
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: To prevent ground
loops, isolation needs to be
maintained from input to out-
put when using switched DC
or analog process outputs .
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically .
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit . Additional switches
may be wired in series to the
terminals .
Ó
WARNING: If high voltage is
applied to a low-voltage con-
troller, irreversible damage
will occur .
Watlow EZ-ZONE
®
ST
•
22
•
Chapter 2 Install and Wire
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 .
Output 2 Mechanical Relay, Form A
common
normally open
L2
K2
Slot B
• 5 A at 240V
Å
(ac) or 30V
Î
(dc)
maximum resistive load
• 20 mV at 24V minimum load
• 125 VA pilot duty @ 120/240V
Å
(ac), 25 VA at 24V
Å
(ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST
(H, D, J, C)
_
- _ _ _ _ - _ _ _ _
L2
K2
Output 2 Solid-State Relay, Form A
common
normally open
L2
K2
Slot B
• 0.5 A at 20 to 264V
Å
(ac) maxi-
mum resistive load
• 20 VA 120/240V
Å
(ac) pilot duty
• opto-isolated, without contact
suppression
• maximum off state leakage of
105 microamperes
• Output does not supply power.
• Do not use on dc loads.
See Quencharc note.
ST
(K, B, P, E)
_
- _ _ _ _ - _ _ _ _
L2
K2
Output 3 Mechanical Relay, Form C
normally open
normally closed
common
L3
K3
J3
Slot A
• 5 A at 240V
Å
(ac) or 30V
Î
(dc)
maximum resistive load
• 20 mA at 24V minimum load
• 125 VA pilot duty at 120/240V
Å
(ac), 25 VA at 24V
Å
(ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST _
L
- _ _ _ _ - _ _ _ _ (limit)
J3
normally open
common
normally closed
L3
K3
Output 4 Mechanical Relay, Form A
common
normally open
A1
L4
Slot A
• 2 A at 240V
Å
(ac) or 30V
Î
(dc)
maximum resistive load
• 20 mV at 24V minimum load
• 125 VA pilot duty at 120/240V
Å
(ac), 25 VA at 24V
Å
(ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST _
L
- _ _ _ _ - _ _ _ _ (limit)
L4
A1
