Watlow Series L
•
9
•
Chapter 3: Wiring
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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 electrical
sensors or peripheral de-
vices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Note:
Use of an external reset
switch may affect FM ap-
proval. Only the use of a
momentary N.O. switch is
valid for approval.
Note:
Insulated terminals re-
quired for quick connect
style terminals.
For quick connect termi-
nals 1, 2, 6, 7, 8, 9, and
10, AMP P/N 3-520406-2
or equivalent recommend-
ed. Use Amp crimp tool P/
N 58078-3, insert 90391-3.
For quick connect termi-
nals 3, 4, and 5, AMP P/N
2-520405-2 or equivalent
recommended. Amp crimp
tool P/N 58078-3, insert
58079-3.
Quencharc Note:
Switching pilot duty loads
(relay coils, solenoids, etc.)
with the mechanical relay
output option requires use
of an R.C. suppressor.
Watlow carries the R.C.
suppressor Quencharc
brand name, which is a
trademark of ITW Paktron.
Watlow Part No. 0804-
0147-0000.
Figure 9a —
External Reset Switch
• Momentary normally open (N.O.), dry contact closure
Note: To reset the LS controller, cycle input power to the controller.
1
2
3
4
5
6
10
9
8
7
SW-2
SW-1
Momentary N.O. Switch
(customer supplied)
Figure 9b - Form C
Mechanical Relay Output (LF/LV only)
• Form C contacts
• 8 A, resistive
• 250 VA pilot duty,
120/240V
Å
(ac), induc-
tive
• 240V
Å
(ac) maximum
• 30V
Î
(dc) maximum
• See Quencharc note
• For use with ac or dc
• Minimum load current
100 mA
• Output does not supply
power
Figure 9c - Form A Mechanical Relay Output (LS only)
• Form A contact
• 8 A, resistive
• 120 VA pilot duty, 120/240V
Å
(ac), inductive
• Does not need Quencharc
• Rated 6000 cycles
Internal Circuitry
COM.
N.O.
Mechanical Relay
N.C.
Normally Open
Common
Normally Closed
L1
L2
External
Load
Customer supplied Quencharc
for pilot duty, inductive loads
only. See note.
1
2
3
4
5
6
10
9
8
7 C
N.C.
N.O.
Normally Open
Common
L1
L2
External
Load
Com
N.O.
N.O.
Com
Mechanical Relay
Internal Circuitry
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