Install and Wire, Chapter 2
11
WATLOW Series 945 User's Manual
Wiring Example
WARNING:
All wiring and fusing must conform to the National Electric Code NFPA70 and to
any locally applicable codes. Contact your local board for additional information.
Failure to observe NEC safety guidelines could result in injury to personnel.
CAUTION:
Watlow mercury relays are designed to be used only with resistive loads.
Figure 27 -
System Wiring
Example
1 4-20, 0-5 +
2 4-20, Jumper to 3
3 4-20, 0-5 -
4 S1
5 S2
6 S3
7 T.C. +
8 Not Used
9 T.C. -
10 L1 240V
11 L1 120V
12 L2
13 Earth Ground
14 N.O.
15 Com.
16 Com.
17 N.O.
18 N.C.
Terminal
Function
Output #1
Output #2
945A-2DD0-A000
945A-2DD0-A000
Rear View
(+)
9
7
12
13
11
16
17
(-)
L1
L2
COM
N.O.
Ground
Mercury
Relay for
Control
120 VAC
Fuse
140A-16XX-6000
High Limit Control
(-) (+)
Coil
Heater
Process Sensor
Limit Sensor
Normally Open
Momentary
Switch
Red
High Limit
Mechanical
Contactor
Earth Ground
1CR
Series 945
Temperature
Control
Hg
1
L1
11
L2
12
2
7
9
16
4
5
17
1
2
1
2
1
2
1
2
(+)
(-)
3
6
8
15
16
Heater
1CR-1
2CR-1
Hg
17
18
L1
L2
7
9
10
TC (+)
TC (-)
11
12
945A-2DD0-A000
140A-1601-6000
N.O.
N.C.
2
2CR
13
Hi Temp. Light
1
2
3
4
5
6
7
8
9
10
11
12
Series 140
Limit
Control
Reset
COM
R
COM
ç
ç
