Watlow Series 988LF - Manual (Page 18)

2.8 WATLOW Series 988LF User’s Manual Installation and Wiring, Chapter 2
Figure 2.8d —
0-20mA or 4-20mA Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 7
Ω
Remote Set Point Option
Figure 2.8c —
0-5V О О , 1-5V О О or 0-10V О О (dc) Process
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 10K
Ω
Remote Set Point Option
Figure 2.8b —
RTD (2 or 3 Wire) 100
Ω
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Remote Set Point Option
20
19
-
+
Figure 2.8a —
Thermocouple or 0-50mV (high impedance)
Universal signal conditioner
98 _ L - _ 2 _ _ - A A _ _
Input impedance: 20M
Ω
Remote Set Point Option
19
20
+
-
Jumper
#19 to #20
for 2 wire
RTD
19
20
18
S2
S1
DIP Switch
Setting
R, S, B
DIP Settings
J, K, T, N, C, E, D, Pt2,
0-50mV DIP Settings
DIP Switch
Setting
19
20
18
S2
S1
S3
O
N
↑
1 2 3
O
N
↑
1 2 3
O
N
↑
1 2 3
O
N
↑
1 2 3
20
18 -
+
DIP Switch
Setting
O
N
↑
1 2 3
19
20
+
-
0-50mV
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).
Input 2 Wiring
ç
CAUTION:
An external resistor
is required for
0-20mA and 4-20mA
process wiring to
prevent a high in-
rush current which
could burn out the
controller’s 7-ohm
resistor. See page
2.4 for recommen-
dations.