Watlow Series 998 - Manual (Page 21)

WATLOW Series 998 User’s Manual 2.9 Installation and Wiring, Chapter 2
Channel B Input Wiring
Figure 2.9a
— Thermocouple
Thermocouple only
99 _ _ - _ 1 _ _ - _ _ _ _
Universal signal conditioner
99 _ _ - _ 2 _ _ - _ _ _ _
Figure 2.9b
— RTD, 2- or 3-wire
99 _ _ - _ 2 _ _ - _ _ _ _
Figure 2.9c
— 0-5V О О , 1-5V О О , 0-10V О О (dc) Process
99 _ _ - _ 2 _ _ - _ _ _ _
Input impedance: 10K
Ω
Figure 2.9d
— 0-20mA or 4-20mA Process
99 _ _ - _ 2 _ _ - _ _ _ _
Input impedance: 7
Ω
NOTE:
Model number
99_ _-_ 1 _ _-_ _ _ _
has no In1 DIP
switch.
19
20
+
-
19
20
18
S2
S1
Jumper
19 to 20
for 2-wire
RTD
19
20
18
S2
S1
S3
20
18 -
+
m A
20
19
-
+
V
DC
NOTE:
Using a grounded
thermocouple for
both input 1 and
input 2 can cause
ground loop prob-
lems.
O
N
↑
1 2 3
O
N
↑
1 2 3
J, K, T, N, C, E, Pt2, D
Dip Switch Setting
R, S, B
Dip Switch Setting
O
N
↑
1 2 3
Dip Switch Setting
O
N
↑
1 2 3
Dip Switch Setting
O
N
↑
1 2 3
Dip Switch Setting
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.