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2.12 WATLOW Series 988 User’s Manual
Installation and Wiring, Chapter 2
Figure 2.12a — AC Outputs
Solid-state Relay
with
Contact Suppression
98 _ _ - _ _ B _ - _ _ _ _
0.5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay
with
Contact Suppression
(Suppression between NO and COM contacts only)
98 _ _ - _ _ D _ - _ _ _ _
Form C, 5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay
without
Contact Suppression
98 _ _ - _ _ E _ - _ _ _ _
Form C, 5 amps off-state impedance: 31MΩ
Solid-state Relay
without
Contact Suppression
98 _ _ - _ _ K _ - _ _ _ _
0.5 amps, off-state impedance: 31MΩ
Output 1 Wiring
Figure 2.12b — Switched DC, Open Collector
98 _ _ - _ _ C _ - _ _ _ _
Maximum voltage: 42V
ÎÎ
(dc)
Maximum current: 1A
External
Load
COM
L1
L2
Fuse
NO
12
13
NC
14
(#14 for D & E outputs only)
12
External
Load
+
13
14
-
COM
Figure 2.12d — 0-5V
ÎÎ
, 1-5V
ÎÎ
and 0-10V
ÎÎ
(dc) Process
98 _ _ - _ _ F _ - _ _ _ _
Minimum load impedance: 1KΩ
Figure 2.12c — 0-20mA and 4-20mA Process
98 _ _ - _ _ F _ - _ _ _ _
Maximum load impedance: 800Ω
14
-
+
12
14
-
+
13
+
Internal Circuitry
12
13
14
790Ω
19 to 32VÎ (dc)
NOTE:
Successful installa-
tion requires five
steps:
• Model number and
software choice
(Appendix);
• DIP switch set-
tings (Chapter 1);
• Sensor match
(Chapter 2 and
Appendix);
• Sensor installation
(Chapter 2); and
• Wiring (Chapter 2).
NOTE:
Switching inductive
loads (relay coils,
solenoids, etc.) with
the mechanical
relay or solid state
relay output options
requires using 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.
C2.wc 5/14/1999 8:44 AM Page 2.12