Watlow Series 988 - Manual (Page 24)

Figure 14c —
Process Retransmit
0-20mA, 4-20mA, Load impedance: 600 Ω max.
98 _ _ - _ _ _ _ - M _ _ _
0-5VО О, 1-5VО О, 0-10VО О (VDC) , Load impedance: 500 Ω 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 14d —
External Signal Conditioner Power Supply
98 _ _ - _ _ _ _ - T _ _ _
Figure 14a —
AC Outputs
Solid-state Relay with Contact Suppression
98 _ _ - _ _ _ _ - B _ _ _
0.5 amps, minimum off-state impedance: 20K
Ω
Electromechanical Relay without Contact Suppression
98 _ _ - _ _ _ _ - J _ _ _ _
Form A or B, 5 amps, off-state impedance: 31M Ω
Solid-state Relay without Contact Suppression
98 _ _ - _ _ _ _ - K _ _ _ _
0.5 amps, off-state impedance: 31M Ω
External
Load
COM
L1
L2
Fuse
NO Form A 1
2
NC Form B
or
- -
Figure 14b —
Switched DC
98 _ _ - _ _ _ _ - C _ _ _
Minimum load resistance: 500 Ω
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
790 Ω
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