3 . 8
■
W i r i n g
Wa t l o w S e r i e s 9 7
Output 2 Alarm Output Wiring
Figure 3.8a –
AC Outputs
•Electromechanical relay without contact suppression
97 _ _ - _ D _ _ _ - _ _ _ _
Form C, 2 amps, off-state
impedance: 31M
Ω
•Solid-state relay without
contact suppression
97 _ _ - _ K _ _ - _ _ _ _
0.5 amps, off-state
impedance: 31M
Ω
Figure 3.8b –
Switched DC, Open Collector
97 _ _ - _ C _ _ - _ _ _ _
Switched DC
configuration:
Maximum voltage:
28V
Î
(dc)
Maximum current:
30mA
Open collector configuration:
Maximum voltage: 42V
Î
(dc)
Maximum current: 200 mA
+V
Î
(dc)
Internal Circuitry
16
18
17
22 to 28V
Î
(dc)
10
8
1
2
3
4
5
6
7
13 14 15
11
12
16 17 18
19 20 21
9
+ 16 17 18 -
External
Load
COM.
Switched DC
10
8
1
2
3
4
5
6
7
13 14 15
11
12
16 17 18
19 20 21
9
External
Load
COM. N.C.
L2
L1
16 17 18
(18 used for
D outputs only)
N.O.
customer-supplied
Quencharc
NOTE:
Successful installation
requires five steps:
• Choose the controller’s
hardware configuration
and model number
(Appendix);
• Choose a sensor
(Chapters 3 and 6, and
Appendix);
• Install the controller
(Chapter 2);
• Wire the controller
(Chapter 3) and
• Configure the controller
(Chapters 4, 5 and 6).
NOTE:
Switching inductive loads
(relay coils, solenoids,
etc.) with the mechanical
relay, switched dc or
solid-state relay output
options requires use of
an R.C. suppressor.
Watlow carries the R.C.
suppressor Quencharc
brand name, which is a
trademark of ITW Pakron.
Watlow Part No. 0804-
0147-0000.
ç
WARNING:
To avoid damage to
property and equipment,
and/or injury of loss of
life, use National Electric
Code (NEC) standard
wiring practices to
install and operate the
Series 97. Failure to do
so could result in such
damage, and/or injury or
death.
