Owner manual

Watlow Controls 2 EHG CL User’s Guide
Navigating the Series EHG CL with the Front Panel
The three-character display normally shows the process
temperature. To view and change the existing Set Point
value follow the steps below:
1. Press the Mode Key once. The right decimal point
will illuminate when viewing the Set Point value.
2. Press the Up-Arrow or Down-Arrow Key to change
the Set Point.
3. Press the Mode Key again to return to the process
temperature display.
The display will automatically return to showing the
process temperature after three seconds.
To view or change parameter values follow the steps
below:
1. Hold down both the Up-Arrow and Down-Arrow Keys
for five seconds.
This will display the Set Point High Limit prompt.
2. Press the Mode Key to view the other parameter
prompts.
3. Press the Up-Arrow or Down-Arrow Key once to view
a parameter’s value.
4. Press the Up-Arrow or Down-Arrow Key to increase
or decrease that value.
5. Press the Mode Key to again display the prompt and
again to display the next prompt.
6. Press the Mode Key at the Display Build Number
prompt to return to the process value display.
Display Parameter Name & Description Range Default
Modbus
Relative
Address
Data Type
& Read/
Write
Numeric
Process Value Controller
View the present Process Value.
-18 to 537°C (0 to 999°F) 20°C (68°F)
20
unsigned
integer
R
Numeric
Closed Loop Set Point
Set the set point that the controller
will automatically control to.
0°C (32°F) to SLA setting 150°C (302°F)
34
unsigned
integer
RWE
No Dis-
play
Heat Output Power
Read (via Modbus communications)
the present heat output power level.
0 to 100% 0
22
unsigned
integer
R
No Dis-
play
Alert Status
Read (via Modbus communications)
the present alert status.
Alert Low (7)
Alert High (8)
Alert None (6)
Alert None
31
unsigned
integer
R
No Dis-
play
Process Comparison Value
Set or read (via Modbus communica-
tions) the Process Comparison Value.
5 to 50°C (9 to 90°F) 20°C (68°F)
68
unsigned
integer
RWE
No Dis-
play
Limit Status
Read (via Modbus communications)
the present condition of the limit.
Bit 5 (0x0020)
0 = Not tripped (process value below
limit high set point)
1 = Tripped (process value exceeds
limit high set point)
0
63
unsigned
integer
R
No Dis-
play
Controller Sensor Status
Read (via Modbus communications)
the present status of the controller
sensor.
Bit 2 (0x0004)
0 = Good
1 = Failure
0
23
unsigned
integer
R
No Dis-
play
Limit Sensor Value
View the present value of the limit
sensor.
-18 to 537°C (0 to 999°F) 20°C (68°F)
60
unsigned
integer
R
[SLA]
[SLA]
Limit High Set Point
Set the high process value that will
trigger the limit.
0 to 438°C (32 to 820°F) 200°C (392°F)
33
unsigned
integer
RWE
[Cnt]
[Cnt]
Control Mode Select
Select a control method.
[onF] On-Off (2)
[PId] PID (3)
on-off
42
unsigned
integer
RWE
Note:
All values above 999 will be rounded off to fit in the three-character display. Full values can be
read with other interfaces.
Note:
The EHG CL does not support Modbus function code 16 (0x10) Write Multiple Registers. Pa-
rameter values must be written individually with function code 6 (0x06) Write Single Registers.
R: Read
W: Write
E: EEPROM