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Figure 2.14c — Process Retransmit
0-20mA, 4-20mA, Load impedance: 600Ω max.
98 _ _ - _ _ _ _ - M _ _ _
0-5V
ÎÎ
, 1-5V
ÎÎ
, 0-10V
ÎÎ
(VDC), Load impedance: 500Ω min.
98 _ _ - _ _ _ _ - N _ _ _
2.14 WATLOW Series 988 User’s Manual
Installation and Wiring, Chapter 2
NOTE:
Input-to-output iso-
lation is defeated
when the external
signal conditioner
power supply is
used to power a
transmitter con-
nected to input 1 or
input 2.
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).
Figure 2.14d — External Signal Conditioner Power Supply
98 _ _ - _ _ _ _ - T _ _ _
Figure 2.14a — AC Outputs
Solid-state Relay
with
Contact Suppression
98 _ _ - _ _ _ _ - B _ _ _
0.5 amps, minimum off-state impedance: 20KΩ
Electromechanical Relay
without
Contact Suppression
98 _ _ - _ _ _ _ - J _ _ _ _
Form A or B, 5 amps, off-state impedance: 31MΩ
Solid-state Relay
without
Contact Suppression
98 _ _ - _ _ _ _ - K _ _ _ _
0.5 amps, off-state impedance: 31MΩ
External
Load
COM
L1
L2
Fuse
NO Form A
1
2
NC Form B
or
-
-
Figure 2.14b — Switched DC
98 _ _ - _ _ _ _ - C _ _ _
Minimum load resistance: 500Ω
1
2
External
Load
-
+
1
2
+
-
+V
-V
Transmitter
4-20mA out
Input
1 or 2
+
-
Form B
Form A
Form A or B
alarm jumper
settings (98__-
____-J___ only)
˜
NOTE:
See Chapter 1 for
power supply DIP
switch information.
+
Internal Circuitry
1
2
790Ω
19 to 32VÎ (dc)
1
2
+
-
Output 3 Wiring
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.
Loop powered
C2.wc 5/14/1999 8:45 AM Page 2.14