Ground connection – Watlow EZ-ZONE ST User Manual
Page 13
Watlow EZ-ZONE
®
ST
•
11
•
Chapter 2 Install and Wire
-
-
+
-
+
+
-
+
-
+
1 2 3 4
ON
RTD
(Input 2)
2-wire
3-wire
Thermocouple
(Input 2)
N.O. (Output 3)
N.C. (Output 3)
common (Output 3)
N.O. (Output 4)
contactor (Coil 1)
ST_ L - _ _ _ _ - _ _ _ _
all
T-/R- (RUI)
T+/R+ (RUI)
common (RUI)
- common (Digital I/O)
+ Digital Input 6 or Output 6
+ Digital Input 5 or Output 5
ST_ _ - _ _ A _ - _ _ _ _
Remote User Interface
(RUI)
T-/R- (Modbus RTU)
T+/R+ (Modbus RTU)
common (Modbus RTU)
- common (Digital I/O)
+ Digital Input 6 or Output 6
+ Digital Input 5 or Output 5
ST_ _ - _ _ M _ - _ _ _ _
Modbus RTU on EIA-485
Limit
Power
Control
Address
Selection
load
-
S1
S2
S3
+
S1
S3
2-wire
3-wire
Thermocouple
(Input 1)
Process
0 to 20 mA
(Input 1)
Process
0 to 10V
Î (dc)
0 to 50mV
Î (dc)
(Input 1)
N.O. (Output 2)
common (Output 2)
Controller
RTD
(Input 1)
hot
neutral
fuse
98
99
CF
CD
CE
B5
D6
D5
L2
K2
T1
S1
R1
98
99
CC
CA
CB
B5
D6
D5
L2
K2
T1
S1
R1
L3
K3
J3
A1
L4
T2
S2
R2
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
S1
S2
S3
L3
K3
J3
A1
L4
T2
S2
R2
L3
K3
J3
A1
L4
T2
S2
R2
S1
S3
L2
K2
T1
S1
R1
L3
K3
J3
A1
L4
T2
S2
R2
L3
K3
J3
A1
L4
T2
S2
R2
load
hot
hot
fuse
fuse
2
1
EZ-ZONE™ ST
Patent Pending
Integrated Control Loop
LIMIT
OUT 3
SSR
STATUS
OUT 2
Indicator
Lights
Process
0 to 10V
Î (dc)
0 to 50mV
Î (dc)
(Input 2)
Process
0 to 20 mA
(Input 2)
Power
Power
Power
Output 1 (SSR)
Output 1 (SSR)
Ground Connection
Connect the ground to the heat sink.
There is no ground connection on mod-
els without a heat sink.
Note:
The control common terminal and the digital
common terminal are referenced to different
voltages and must remain isolated .
Note:
If 75A heat sink is ordered D6
(Digital Input) will be factory set
and used as the SSR over tem-
perature shut-down.