Watts AERCO Eurotherm 3508 User guide

Heating and Hot Water Solutions
AERCO International, Inc. • 100 Oritani Drive • Blauvelt, NY 10913
USA: T: [phone] • Toll Free: [phone] • AERCO.com
Technical Support • [phone] • Mon-Fri, 8 am - 5 pm EST
© 2022 AERCO
TAG-0101 • DRAFT
Eurotherm 3508 Controller
Technical Application Guide
Disclaimer
The information contained in this manual is subject to change without notice
from AERCO International, Inc. AERCO makes no warranty of any kind with
respect to this material, including, but not limited to, implied warranties of
merchantability and fitness for a particular application. AERCO International is
not liable for errors appearing in this manual, not for incidental or
consequential damages occurring in connection with the furnishing,
performance, or use of these materials.

Eurotherm 3508 Controller Guide
Section 1: OPERATOR BUTTONS
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 2of 10
1 OPERATOR BUTTONS
A/MAN
This button
can be
disabled
Toggles the selected loop between Auto and Manual operation.
Manual operation means that the controller output power is adjusted by the user. The input
sensor is still connected and reading the PV but the control loop is open.
Auto means that the controller is automatically adjusting the output to maintain control, ie
the loop is closed.
If the controller is in manual mode, ‘MAN’ light will be indicated.
If the controller is powered down in Manual operation it will resume this mode when it is
powered up again.
PROG
To select the programmer summary page
RUN/HOLD
This button
can be
disabled
Press once to start a program. ‘RUN’ will be indicated
Press again to hold a program. ‘HLD’ will be indicated
Press and hold for at least two seconds to reset a program.
‘RUN’ will flash at the end of a program
‘HLD’ will flash during holdback

Press to select new PAGE headings

Press to select a new parameter in the page
▼
Press to decrease an analogue value, or to change the state of a digital value
▲
Press to increase an analogue value, or to change the state of a digital value
Page
Scroll
Lower
Raise
Auto/Manual

Eurotherm 3508 Controller Guide
Section 2: NORMAL OPERATION HOME DISPLAY
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 3of 10
2 NORMAL OPERATION HOME DISPLAY
When the or button is
pressed the Setpoint source
is shown, e.g. SP1
Output/Valve Position
& Bar Graph Indicator, e.g.
OP1
Units
Process Variable (PV1)
Setpoint (SP1)

Eurotherm 3508 Controller Guide
Section 3: BEACON DISPLAY AND DESCRIPTION
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 4of 10
3 BEACON DISPLAY AND DESCRIPTION
OP1
In a single loop controller OP1 and OP2 operate channel 1 and 2 outputs respectively for the
configured loop.
MAN
Illuminates when manual mode active. If the HOME display is showing the dual loop overview, MAN
illuminates if Loop 1 is in manual. If the Loop 1 or Loop 2 overviews are being displayed MAN applies
to the loop being displayed.
REM
Illuminates when remote setpoint active
ALM
If an alarm occurs the red alarm beacon flashes accompanied by message showing source of alarm.
To acknowledge press and . The message disappears. If the alarm condition is still present the
beacon lights continuously. When cleared it will extinguish.
H
Flashes when H Channel comms active

Eurotherm 3508 Controller Guide
Section 4: SELECTING AUTO/MANUAL OPERATION
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 5of 10
4 SELECTING AUTO/MANUAL OPERATION

Eurotherm 3508 Controller Guide
Section 5: ACCESS LEVELS
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 6of 10
5 ACCESS LEVELS
Parameters are available under different levels of security are
Level 1, Level 2, Level 3 and Configuration Level.
Level 1 has no security password since it contains a minimal
set of parameters generally sufficient to run the process on a
daily basis.
Level 2 allows parameters, such as those used in
commissioning a controller, to be adjusted.
Level 3 makes all operating parameters available and alterable (if not read only). Examples are:
•Range limits
•setting alarm levels
•communications address.
The instrument will continue to control when in Levels 1, 2or 3.
Configuration Level makes available all parameters including the operating parameters so that there
is no need to switch between configuration and operation levels during commissioning. It is designed
for those who may wish to change the fundamental characteristics of the instrument to match the
process. Examples are:
•Input (thermocouple type)
•Alarm type
•Communications type.
In Configuration Level the controller will not necessarily be controlling the process or providing alarm
indication. Do not select configuration level on a live process.
Level Pass Code
Level 1 Default
Level 2 42
Level 3 106
Config 303
Eurotherm 3508 Access Levels

Eurotherm 3508 Controller Guide
Section 6: SELECTING ACCESS LEVELS
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 7of 10
6 SELECTING ACCESS LEVELS
1. From any display press and hold the PAGE ()button. After a few seconds the display will
enter the Access List & show: Goto Level 1.
NOTE: Press SCROLL () button to scroll through the list of Access parameters. If
no button is pressed for about 2 minutes the display returns to the HOME display.
2. Press UP▲or DOWN ▼button to select access level.
3. Use UP▲and DOWN ▼buttons to scroll to passcode (1-999) .
Note: It is not necessary to enter a code when changing to a lower level.

Eurotherm 3508 Controller Guide
Section 7: FUNCTION BLOCK NAVIGATION DIAGRAM
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 8of 10
7 FUNCTION BLOCK NAVIGATION DIAGRAM

Eurotherm 3508 Controller Guide
Section 8: CHANGING MODBUS ADDRESS
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 9of 10
8 CHANGING MODBUS ADDRESS
1. From Access Level 3 press until the Digital Communications Function Block is displayed.
2. Press▲ or▼until Comms Identity “H” is displayed.
3. Press until the Address Parameter is displayed.
4. Press▲ or▼until the desired Comm Address is displayed.

Eurotherm 3508 Controller Guide
Section 9: TRANSITION FROM LOCAL TO REMOTE SETPOINT CONTROL
TAG-0101 •DRAFT Technical Support •[phone] •Mon-Fri, 8 am - 5 pm EST Page 10 of 10
9 TRANSITION FROM LOCAL TO REMOTE SETPOINT CONTROL
1. Press until the Control Loop 1 (Lp1) Function
Block is displayed.
2. Press▲ or▼until Setpoint (SP) is displayed.
3. Press until the Alternate Setpoint Enable (Alt SP En) is displayed.
4. Press▲ or▼to select YES.
5. The Remote Beacon will appear on the Display.
6. Write the Remote Setpoint to Modbus Holding Register 485 (AltSP).