Watlow EHG SL10 User Manual

Series EHG SL10

Integrated Temperature Controller

User’s Guide

The Series EHG SL10 is a powerful instrument that in­tegrates a temperature process controller, high-low tem­perature alert, and power switching with a safety high
limit that meets UL® 1998 and CE 60730 requirements.
The optional display and communications modules can
be easily upgraded in the field to provide a digital dis­play, adjustable control parameters, RS-485 MODBUS
communications and other interface features. The com­pact design, inherent reliability and integrated safety
limit functions make this control a tremendous value.
The control is designed for easy integration with Wat­low heaters providing additional value to simplify the
engineering and component count on new equipment.
CE compliance and UL recognition will reduce time and
costs necessary for global agency testing and validation
for OEMs.

Features

Standard Base Module

• Two, type K thermocouple inputs: process temperature
controller and safety limit

• Process temperature output: 10 amp “NO ARC” relay

• Safety limit: 10 amp relay

• High-low temperature alert: 2 amp, 30Vı (ac/dc), Form
A relay

• On-off and PID temperature control algorithm: Up­graded via communications to PID algorithm (minimum
cycle time 5 seconds)

0600-0050-0000 Rev. D

February 2011

Integrated Temperature Control

• Standard Molex Connectors

• Dimensions

Configuration Width Depth Height

basic unit 88.8 mm

with mounting bracket 88.8 mm

with communicatons-dis­play module & mounting
bracket

Optional Communications Module

• Field adjustable set point

• Access to PID parameters

• Modbus RTU Communications

• RS-485

• 3-character, 7-segment LED display

• User Interface Software
The Series EHG SL10 User’s Guide is copyrighted by

Watlow Winona, Inc., © February 2011, with all rights
reserved.

Patent Pending

1241 Bundy Boulevard

Phone: [phone]; Fax: [phone]

http://www.watlow.com

(3.496 in)

(3.496 in)

88.8 mm
(3.496 in)

Watlow Winona

Winona, MN 55987

40.2 mm
(1.582 in)

48.4 mm
(1.907 in)

63.6 mm
(2.503)

55.8 mm
(2.196 in)

55.8 mm
(2.196 in)

55.8 mm
(2.196 in)

Navigating the Series EHG SL10 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

Process Value Controller

Numeric

Numeric

No Dis­play

No Dis­play

No Dis­play

No Dis­play

No Dis­play

No Dis­play

[SLA]

[SLA]

[HtA]

[HtA]

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 SL10 does not support Modbus function code 16 (0x10) Write Multiple Registers. Pa­rameter values must be written individually with function code 6 (0x06) Write Single Registers.

View the present Process Value.

Closed Loop Set Point

Set the set point that the controller will au­tomatically control to.

Heat Output Power

Read (via Modbus communications) the
present heat output power level.

Alert Status

Read (via Modbus communications) the
present alert status.

Process Comparison Value

Set or read (via Modbus communications)
the Process Comparison Value.

Limit Status

Read (via Modbus communications) the
present condition of the limit.

Controller Sensor Status

Read (via Modbus communications) the
present status of the controller sensor.

Limit Sensor Value

View the present value of the limit sensor.

Limit High Set Point

Set the high process value that will trigger
the limit.

High Temperature Alert Value

The High Temperature Alert occurs when
the process variable exceeds the set point by
more than the value set here.

-18 to 400°C (0 to 752°F) 20°C (68°F)

0°C (32°F) to Set Point High Limit 150°C (302°F)

0 to 100% 0

Alert Low (7)
Alert High (8)
Alert None (6)

5 to 30°C (9 to 54°F) 20°C (68°F)

Bit 5 (0x0020)
0 = Not tripped (process value below

limit high set point)

1 = Tripped (process value exceeds

limit high set point)

Bit 2 (0x0004)
0 = Good
1 = Failure

-18 to 400°C (0 to 752°F) 20°C (68°F)

0 to 220°C (32 to 428°F) 200°C (392°F)

1 to 99°C (2 to 178°F) 20°C (36°F)

Alert None

0

0

Modbus
Relative
Address

20

34

22

31

68

63

23

60

43

35

Data Type

& Read/

Write

unsigned
integer

R

unsigned
integer

RWE

unsigned
integer

R

unsigned
integer

R

unsigned
integer

RWE

unsigned
integer

R

unsigned
integer

R

unsigned
integer

R

unsigned
integer

RWE

unsigned
integer

RWE

R: Read
W: Write
E: EEPROM

Watlow Controls 2 EHG SL10 User’s Guide

Display Parameter Name & Description Range Default

[ltA]

[LtA]

[Cnt]

[Cnt]

[HyS]

[HyS]

[`Pb]

[ Pb]

[Int]

[Int]

[dEu]

[dEv]

[`Ct]

[ Ct]

[Abt]

[Abt]

[Adr]

[Adr]

[bAU]

[bAU]

[tU`]

[tU ]

[rpp]

[rPP]

[bru]

[brv]

[bPu]

[bPv]

[bbu]

[bbu]

[dru]

[drv]

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 SL10 does not support Modbus function code 16 (0x10) Write Multiple Registers. Pa­rameter values must be written individually with function code 6 (0x06) Write Single Registers.

Low Temperature Alert Value

The Low Temperature Alert occurs when the
process variable is below the set point by
more than the value set here.

Control Mode Select

Select a control method.

On-Off Hysteresis

Set the how far below the set point the tem­perature can drop before the heater turns
on.

Proportional Band

Set the proportional band in temperature
units.

Integral

Set the integral value in minutes per repeat.

Derivative

Set the derivative value in minutes.

Cycle Time

Set the cycle time in seconds.

Ambient Temperature

View the ambient temperature.

Modbus Device Address

View and or change the present Modbus
address.

Modbus Baud Rate

Select the communication speed.

Temperature Units

Select the temperature scale.

Restore Programmed Parameters

Restore factory default settings.

Base Release Version

View the controller’s base release version.

Base Prototype Version

View the controller’s base prototype version.

Base Build Version

View the controller’s base build number.

Display Release Version

View the interface’s release version.

5 to 99°C (9 to 178°F) 20°C (36°F)

[onF]

On-Off (2)

[PId]

PID (3)

3 to 28°C (5 to 50°F) 3°C (6°F)

0 to 68°C (0 to 122°F) 0°C or 0°F

0 to 999 0

0 to 999 0

5 to 60 10

0 to 106°C (0 to 190°F) 43°C (77°F)

1 to 247 1

[`96]

9,600 (15)

[192]

19,200 (16)

[384]

38,400 (17)

[``F]

°F (4)

[``C]

°C (5)

[yes] Yes

on-off

9,600

°C

No

[`no] No

0 to 9999

- - - - 48

0 to 9999

- - - - 49

0 to 9999

- - - - 50

0 to 9999

- - - - 11

Modbus
Relative
Address

36

42

41

37

38

39

40

24

15

16

17

- - - - - - - -

Data Type

& Read/

unsigned
integer

RWE

unsigned
integer

RWE

unsigned
integer

RWE

signed in­teger

RWE

signed in­teger

RWE

signed in­teger

RWE

unsigned
integer

RWE

unsigned
integer

R

unsigned
integer

RWE

unsigned
integer

RWE

unsigned
integer

RWE

unsigned
integer

R

unsigned
integer

R

unsigned
integer

R

unsigned
integer

R

R: Read
W: Write
E: EEPROM

Write

Watlow Controls 3 EHG SL10 User’s Guide