Watlow Electric 988 用户手册
Figure 2.14c —
Process Retransmit
0-20mA, 4-20mA, Load impedance: 600
Ω
max.
98 _ _ - _ _ _ _ - M _ _ _
0-5VÎ
Î, 1-5VÎ
Î, 0-10VÎ
Î (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.
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.
• DIP switch set-
tings (
tings (
• Sensor match
(
(
and
• Sensor installation
(
(
).
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: 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 2.14b —
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 A
Form A or B
alarm jumper
settings (98__-
____-J___ only)
alarm jumper
settings (98__-
____-J___ only)
˜
NOTE:
See Chapter 1 for
power supply DIP
switch information.
See Chapter 1 for
power supply DIP
switch information.
+
Internal Circuitry
1
2
790
Ω
19 to 32V
Î
(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.
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
Form B