Watlow EHG SL 10 User manual

The Series EHG SL 10 is a powerful instrument that in-
tegrates a temperature process controller, high-low tem-
perature 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 dis-
play, adjustable control parameters, RS485 MODBUS
communications and other interface features. The com-
pact design, inherent reliability and integrated safety
limit functions make this control a tremendous value.
The control is designed for easy integration with Wat-
low 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 and Specifications
Standard Base Module
· 2, Type K Thermocouple Inputs: Process Temperature Controller
and Safety Limit.
· Isolated Universal Power Supply: 100 to 240VÅ(ac) 50/60Hz
· Ambient operating temperature range 0 to 70°C
· 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 com-
munications to PID algorithm (minimum cycle time 5 seconds).
0600-0050-0000 Rev. C
May 2006
Integrated Temperature Control
· Standard Molex Connectors
· Dimensions
configuration width depth height
basic unit 88.8 mm
(3.496 in)
40.2 mm
(1.582 in)
55.8 mm
(2.196 in)
with mounting bracket 88.8 mm
(3.496 in)
48.4 mm
(1.907 in)
55.8 mm
(2.196 in)
with communicatons-dis-
play module & mounting
bracket
88.8 mm
(3.496 in)
63.6 mm
(2.503)
55.8 mm
(2.196 in)
· Agencies: UL®/C-UL Listed, CE, Semi S2
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 SL 10 User’s Manual is copyrighted
by Watlow Winona, Inc., © May 2006, with all rights re-
served.
Patent Pending
Watlow Winona
1241 Bundy Boulevard
Winona, MN 55987
Phone: [phone]; Fax: [phone]
www.watlow.com
Series EHG SL 10
Integrated Temperature Controller
User’s Manual

Watlow Controls 2 EHG SL 10 User’s Manual
Navigating the Series EHG SL 10 with the Front Panel
The three-character display normally shows the process
temperature. Press the Mode Key once to view the Set
Point value. The right decimal point will illuminate
when viewing the Set Point value. Press the Up-Arrow
or Down-Arrow Key to change the Set Point. Press the
Mode Key again to return to the process temperature
display. Otherwise the display will automatically return
to showing the process temperature after three seconds.
To view or change parameter values, hold down
both the Up-Arrow and Down-Arrow Keys for five
seconds. This will display the Set Point High Limit
prompt. Press the Mode Key to view the other param-
eter prompts. Press the Up-Arrow or Down-Arrow Key
once to view a parameter’s value. Press the Up-Arrow
or Down-Arrow Key to increase or decrease that value.
Press the Mode Key to again display the prompt and
again to display the next prompt. Press the Mode Key
at the Display Build Number prompt to return to the
process value display.
Display Parameter Name & Description Range Default Access
Set Point
Set the set point.
0°C (32°F) to Set Point High Limit 150°C (302°F) read/write
[SLA] Set Point High Limit Alarm
Set the temperature at which the limit will turn off
the heater.
0 to 220°C (32 to 428°F) 200°C (392°F) read/write
[HtA] High Temperature Alert (Above Set Point)
Set the high temperature that will trigger an alert.
1 to 99°C (2 to 178°F) 20°C (36°F) read/write
[LtA] Low Temperature Alert (Below Set Point)
Set the low temperature that will trigger an alert.
5 to 99°C (9 to 178°F) 20°C (36°F) read/write
[Cnt] Control Mode Select
Select a control method.
[onF] on-off
[PId] PID
[onF] on-off read/write
[HyS] On-Off Hysteresis
Set the how far below the set point the temperature
can drop before the heater turns on.
3 to 28°C (5 to 50°F) 3°C (6°F) read/write
[`Pb] Proportional Band
Set the proportional band.
0 to 68°C (0 to 122°F) 0°C or F read/write
[Int] Integral
Set the integral value.
0 to 999 0 read/write
[dEu] Derivative
Set the derivative value.
0 to 999 0 read/write
[`Ct] Cycle Time
Set the cycle time.
5 to 60 10 read/write
[Abt] Ambient Temperature
View the ambient temperature.
read only
[Adr] Modbus Device Address
View the controller release version.
1 to 247 1 read/write
[bAU] Modbus Baud Rate
Select the communication speed.
[`96] 9,600
[192] 19,200
[384] 38,400
[`96] 9,600 read/write
[`tU] Temperature Units
Select the temperature scale.
F
C
C read/write
[bru] Base Release Version
View the controller’s base release version.
read only
[bPu] Base Prototype Version
View the controller’s base prototype version.
read only
[bbu] Base Build Number
View the controller’s base build number.
read only
[dru] Display Release Version
View the interface’s release version.
read only
[dPu] Display Prototype Version
View the interface’s prototype version.
read only
[dbu] Display Build Number
View the interface’s build number.
read only

Watlow Controls 3 EHG SL 10 User’s Manual
Up-Arrow Key
Increases the
displayed value.
Down-Arrow Key
Decreases the
displayed value.
Mode Key
Toggles the display between
the set point and process
temperature.
Alarm (flashing red)
Indicates that the process
temperature is higher than the
Set Point High Limit Alarm value.
Alert (solid red)
Indicates that the process
temperature is higher than the
High Alert Set Point.
Output (green)
Indicates that the process
temperature is below the set
point and the output is on.
In range (solid yellow)
Indicates that the process
temperature is between the
High Alert Set Point and Low
Alert Set Point values.
Flashing
Alert/Alarm (red) and
In Range (yellow)
If they are flashing together, that
indicates an Ambient Alarm
(controller temperature higher
than 85°C).
If they are flashing alternately, that
indicates a Health Check Error.
Proportional Control
Some processes need to maintain a
temperature or process value closer
to the set point than on-off control
can provide. Proportional control
provides closer control by adjusting
the output when the temperature
or process value is within a propor-
tional band. When the value is in
the band, the controller adjusts the
output based on how close the pro-
cess value is to the set point.
The closer the process value is to
the set point, the lower the output
power. This is similar to backing
off on the gas pedal of a car as you
approach a stop sign. It keeps the
temperature or process value from
swinging as widely as it would with
simple on-off control. However, when
the system settles down, the tem-
perature or process value tends to
“droop” short of the set point.
With proportional control the
output power level equals (set point
minus process value) divided by the
proportional band value.
Adjust the proportional band
with Proportional [`Pb].
Time
Temperature
Set Point
Proportional Band Droop
Overshoot
Proportional plus Integral (PI)
Control
The droop caused by proportional
control can be corrected by adding
integral control. When the system
settles down, the integral value is
tuned to bring the temperature or
process value closer to the set point.
Integral determines the speed of the
correction, but this may increase
the overshoot at startup or when
the set point is changed. Too much
integral action will make the system
unstable. Integral is cleared when
the process value is outside of the
proportional band.
Integral [Int] is measured in
minutes per repeat. A low integral
value causes a fast integrating ac-
tion.
Proportional plus Integral
plus Derivative (PID) Control
Use derivative control to minimize
the overshoot in a PI-controlled sys-
tem. Derivative [dEu] adjusts the
output based on the rate of change
in the temperature or process value.
Too much derivative will make the
system sluggish.
Time
Temperature
Set Point
Reduced Overshoot
Proportional Band
Proportional Band x 2
Heating Slows
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
Alert/Alarm
In range
Output
flashing
flashing
alternate
flashing
Control
relay
LTA
HTA
relay
Safety
Alarm
relay
off off off
off off on
off on on
on on on
off off off Ambient Alarm
[Abt] 85°C
on off on
off off off Health Check Error
Normal Operating Range
Limit High Set Point [SLA]
High Temperature Alert [HtA]
Low Temperature Alert [LtA]
Temperature
Alarm Hysteresis
Alarm Hysteresis
On-Off Hysteresis [HyS]
Set Point





Keys and Indicator Lights

Watlow Controls 4 EHG SL 10 User’s Manual
Mounting the Series EHG SL 10
88.8 mm
(3.496 in)
55.8 mm
(2.196 in)
Base Controlller
front
48.4 mm
(1.907 in)
Base Controller
side
81.5 mm
(3.210 in)
48.4 mm
(1.905 in)
Interface
front
24.7 mm
(0.974 in)
Interface
side
88.8 mm
(3.496 in)
55.8 mm
(2.196 in)
Base Controller with Interface
front
63.6 mm
(2.503 in)
Base Controller with
Interface side
Panel mount dimensions.
45.72 mm
(1.800 in)
drill and tap for #8-32
Mounting bracket
The Series EHG SL 10 mounting
bracket lets you mount the con-
troller in any of four angles. After
disconnecting both wiring connec-
tors, gently rotate the controller
counterclockwise until it unlocks
from the mounting bracket. Re-ori-
ent the controller on the mounting
bracket and gently rotate it clock-
wise until it locks.
Wiring the Series EHG SL 10
View looking at the connectors.
L1
(black)
L2
(white)
Alarm relay
Com.
Alarm relay
N.O.
134
578
6
2
L1
(black)
L2
(white) L1
Switched
(black)
L2
(white) + (yellow)
– (red)
+ (yellow)
– (red)
134
578
6
2
Heater
Limit
Thermocouple
Process
Thermo-
couple
Power and relay
connectors.
Thermocouple and heater
connector.
Ordering Information
Series EHG SL 10 Integrated Temperature Controller
EHG2- CNTL-_ _ _ _
0000 basic control (purchased only as part of a heater assembly)
DISP with display module
COMS with communications module
DSCM with display & communications module
Additional Cables
A002089: long cable
A002092: long terminating cable
A002162: short cable
A002163: short terminating cable
Declaration of Conformity
Series EHG SL 10
Watlow Winona, Inc.
1241 Bundy Blvd.
Winona, MN 55987 USA
Declares that the following product:
Designation: Series EHG SL 10
Model Numbers: EHG2-CNTL-(0000, DISP, COMS, DSCM)
Classification: Electronic Thermostat with Integrated Temperature Limiter
Protective Control, Control Relay = 2C, Limit Relay = 2B, LTA Relay = 2B Installation Category II, Pollution
degree 2
Rated Supply Source: 100 to 240 V~ (ac), 50 or 60 Hz
IP Code IP20
Rated Power: 5 VA Unit power, 10 A Resistive Heater Load
Meets the essential requirements of the following European Union Directives by using the relevant standards
show below to indicate compliance.
89/336/EEC Electromagnetic Compatibility Directive
EN 60730-1 2001 + A1 Automatic electrical controls for household and
EN 60730-2-9 2002 similar use – Temperature Sensing Controls, Class B Emissions
EN 61000-4-2 1996 + A1, A2 Electrostatic Discharge Immunity
EN 61000-4-3 2002 +A1, A2 Radiated Field Immunity
EN 61000-4-4 2004 Electrical Fast-Transient / Burst Immunity
EN 61000-4-5 1995 + A1, A2 Surge Immunity
EN 61000-4-6 1996 + A1, A2, A3 Conducted Immunity
EN 61000-4-8 1994 + A1 Power frequency magnetic field immunity
EN 61000-4-11 2004 Voltage Dips, Short Interruptions and Voltage
Variations Immunity
EN 61000-4-28 2000 Variation of power frequency immunity – Level 2
EN 61000-3-2 2000 ED.2 Harmonic Current Emissions
EN 61000-3-3 1995 + A1, A2 Voltage Fluctuations and Flicker
SEMI F47 2000 Specification for Semiconductor Processing
Equipment Voltage Sag Immunity – Figure R1-1
73/23/EEC Low-Voltage Directive
EN 61010-1 2001 Safety Requirements of electrical equipment for measurement,
control and laboratory use. Part 1: General requirements
EN 60730-1 2001 + A1 Automatic electrical controls for household and EN 60730-2-9
2002 similar use – Temperature Sensing Controls
UL 1998 Class 1 ED.2 Software in programmable components.
Raymond D. Feller III Winona, Minnesota, USA
Name of Authorized Representative Place of Issue
General Manager October 28, 2005
Title of Authorized Representative Date of Issue
Signature of Authorized Representative
Warranty
The Series EHG SL 10 is warranted to be free of defects in material
and workmanship for 24 months after delivery to the first purchaser
for use, providing that the units have not been misapplied. Since
Watlow has no control over their use, and sometimes misuse, we
cannot guarantee against failure. Watlow’s obligations hereunder, at
Watlow’s option, are limited to replacement, repair or refund of pur-
chase price, and parts which upon examination prove to be defective
within the warranty period specified. This warranty does not apply to
damage resulting from transportation, alteration, misuse or abuse.
WARNING: To avoid damage to property and equipment, and/or
injury or loss of life, use National Electric Code (NEC) standard
wiring practices to install and operate the Series EHG SL 10. Fail-
ure to do so could result in such damage, and/or injury or death.