Watlow SD-Limit User Manual
Registered Company
Winona, Minnesota USA
ISO 9001ISO 9001
TOTAL
3Year Warranty
CUSCUSTTOOMMERER
SSAATISFTISFAACTICTIOONN
Series SD
User’s Manual
0600-0041-0005 Rev. B Made in the U.S.A.
November 2004 $15.00
Limit Controller
1241 Bundy Boulevard., Winona, Minnesota USA 55987
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507 http://www.watlow.com
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Safety Information
We use note, caution and warning symbols throughout this book to draw your attention to important operational and safety information.
“NOTE” marks a short message to alert you to an important detail.
A
A “CAUTION” safety alert appears with information that is important for protecting your equip-
ment and performance. Be especially careful to read and follow all cautions that apply to your application.
A “WARNING” safety alert appears with information that is important for protecting you, others
nd equipment from damage. Pay very close attention to all warnings that apply to your application.
a
The safety alert symbol,
ARNING statement.
W
The electrical hazard symbol,
CAUTION or WARNING safety statement.
ç (an exclamation point in a triangle) precedes a general CAUTION or
Ó (a lightning bolt in a triangle) precedes an electric shock hazard
Technical Assistance
If you encounter a problem with your Watlow controller, review your configuration information to
verify that your selections are consistent with your application: inputs, outputs, alarms, limits, etc.
If the problem persists after checking the configuration of the controller, you can get technical assistance from your local Watlow representative (see back cover), or by dialing +1 (507) 494-5656
between 7 a.m. and 5 p.m., Central Standard Time (CST). Ask for for an Applications Engineer.
Please have the following information available when calling:
• Complete model number • All configuration information
• User’s Manual • Factory Page
Warranty
The series SD is manufactured by ISO 9001-registered processes and is backed by a three-year warranty.
Return Material Authorization (RMA)
1. Call Watlow Customer Service, (507) 454-5300, for a Return Material Authorization (RMA)
number before returning any item for repair. If you do not know why the product failed, contact an
Application Engineer or Product Manager. All RMA’s require:
• Ship to address • Bill to address
• Contact name • Phone number
Method of return shipment
•
• Detailed description of the problem • Any special instructions
• Name and phone number of person returning the product.
2. Prior approval and an RMA number from the Customer Service Department is required when
returning any product for credit, repair or evaluation. Make sure the RMA number is on the outside
of the carton and on all paperwork returned. Ship on a Freight Prepaid basis.
After we receive your return, we will examine it and try to verify the reason for returning it.
3.
4. In cases of manufacturing defect, we will enter a repair order, replacement order or issue credit
for material returned. In cases of customer mis-use, we will provide repair costs and request a purchase order to proceed with the repair work.
5. To return products that are not defective, goods must be be in new condition, in the original
boxes and they must be returned within 120 days of receipt. A 20 percent restocking charge is
applied for all returned stock controls and accessories.
6. If the unit is unrepairable, you will receive a letter of explanation. and be given the option to
have the unit returned to you at your expense or to have us scrap the unit.
Watlow reserves the right to charge for no trouble found (NTF) returns.
7.
•
Your P.O. number
The Series SD User’s Manual is copyrighted by Watlow Winona, Inc., © November 2004 with all
rights reserved.
Watlow Series SD Limit ■ 1 ■ Table of Contents
Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . .2
Chapter 2: Install and Wire . . . . . . . . . . . . . . . . . . . . .4
Dimensions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .4
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Chapter 3: Keys and Displays . . . . . . . . . . . . . . . . .19
Home Page Overview . . . . . . . . . . . . . . . . . . . . . .20
Operations Page Overview . . . . . . . . . . . . . . . . . .20
Setup Page Overview . . . . . . . . . . . . . . . . . . . . . .21
Programming Page Overview . . . . . . . . . . . . . . . .22
Factory Page Overview . . . . . . . . . . . . . . . . . . . . .22
Chapter 4: Home Page . . . . . . . . . . . . . . . . . . . . . . . .23
Chapter 5: Setup Page . . . . . . . . . . . . . . . . . . . . . . . .24
Chapter 6: Operations Parameters Table . . . . . . . .30
Chapter 7: Programming Page . . . . . . . . . . . . . . . .32
Chapter 8: Factory Page and Calibration . . . . . . . .34
Chapter 9: Features . . . . . . . . . . . . . . . . . . . . . . . . . .39
Saving and Restoring User Setings . . . . . . . . . . .40
Operations Page . . . . . . . . . . . . . . . . . . . . . . . . . .40
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .40
Limits . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .42
Retransmit . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .43
Communications . . . . . . . . . . . . . . . . . . . . . . . . . .43
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . .46
Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . .48
Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . .49
Ordering Information . . . . . . . . . . . . . . . . . . . . . . .51
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .52
Declaration of Conformity . . . . . . .Inside back cover
TC
Table of Contents
Watlow Series SD Limit ■ 2 ■ Chapter 1 Overview
The Watlow Series SD family of microprocessorbased limit controllers is available in 1/32, 1/16, 1/8
and 1/4 DIN panel mount sizes*. The Series SD limit is
added to applications to prevent over or under process
conditions. The Series SD limit provides safety assurances against instances where a process runaway condition occurs as a result of a failed sensor or output device.
The Series SD limit is recommended for any application where system runaway could result in large
product scrap costs, damage to system equipment,
potenial fire hazard or risk to personnel. All Series SD
limits are Factory Mutual approved.
The Series SD limit has a single, universal input
that accepts various thermocouples, RTDs (resistive
temperature devices) or process inputs. (See the Specifications in the Appendix for further details).
The Series SD limit offers up to two outputs on the
1/32 DIN, and up to three outputs on all others. Output 1 is always a mechanical relay operating as a
latching limit output. Any mechanical relay output can
be configured as a latching limit output. These can be
configured as a low limit, high limit or low/high limit.
Outputs 2 and 3 can be also configured as latching or
non-latching alarms. Standard Series SD limit features
include an IP65/NEMA 4X front panel rating; CE compliance; dual, four-digit displays. A low-voltage model is also
available.
Advanced features include Modbus, EIA-485 serial
communications to interface with PC software applications; INFOSENSE™ technology that provides lowcost, high-accuracy thermal sensing; and infrared remote communication for easy-to-use setup and monitoring.***
Other operator-friendly features include LED indicators to aid in monitoring and setting up the controller. The Watlow Series SD limit automatically
stores all information in non-volatile memory and provides an additional back-up for user-selected settings.
For more information on these and all other product features, refer to the Features Chapter and the Appendix.
* Also available in a temperature controller version.
** The 1/32 DIN limit comes only with a red
left and green right display.
*** Not available in the 1/32 DIN size.
Overview
1
Figure 2 — Series SD limit inputs and outputs.
23231
231
LIMIT SD
Limit
Output 2
Output 1
Control Input
Limit, Alarm or Communications
Output 3
*
Limit or Alarm
Infrared
Configure**
RESET
Infrared
Monitor**
*1/32 DIN cannot have an Output 3.
**Infrared option is not available on 1/32 DIN.
Watlow Series SD Limit ■ 3 ■ Chapter 1 Overview
Features and Benefits
Patented User Definable Menu System
• Simplifies operator interface.
User Defined Default Settings
• Restores user defined controller settings.
INFOSENSE™ Technology
• Improves sensor accuracy by a minimum of 50%.
INFOSENSE™ Technology
• Improves sensor accuracy by a minimum of 50%.
Infrared Communications
• Facilitates controller setup, operation and monitoring.
Up to three outputs (1/32 DIN two outputs only)
• Application versatility.
• Configuration flexibility
Dual Displays on all models
• Better monitoring of process changes.
Also available in an PID temperature controller
version.
How to use the Series SD limit
Before you use your Series SD limit, it must be installed and configured correctly. Which setup steps
you need to perform will depend on how you will
use it.
If you purchased the limit to design into your
products:
You will need to do the first three steps and maybe
some of the fourth step. Some wiring, such as the final
wiring of a communications connection or an alarm
output for signaling an external device, might be left to
the end user. In highly specialized applications with little variation in operation and heat load, the OEM
might configure almost all the parameters.
If you purchased the limit to design and install
into new equipment for your own use or to retrofit into existing equipment:
You will need to complete all four steps.
If you purchased the limit installed in equipment
designed around it:
You will probably only need to do the fourth step. In
some instances, you may need to wire it for serial communications and/or an alarm output. Some serial communications parameters in the Setup Page may need to
be changed.
Step 1: Mount and install the limit.
The Series SD limit is designed to be panel mounted
in a standard DIN opening. The Series SD is available
in 1/32 DIN, 1/16 DIN, 1/8 DIN-horizontal, 1/8 DINvertical and 1/4 DIN sizes. Cut the correct size hole into the panel and mount the limit, using its mounting
brackets. See Chapter Two for details on installation
and mounting.
If you retrofit the Series SD limit into an existing
application, you may need to modify an existing opening, either by cutting it larger for a larger limit or using
a Watlow adapter plate to adapt it to a smaller limit.
Step 2: Wire the limit.
The limit will need to have its power, input and output wiring installed. The wiring depends on the specific
model number of the Series SD limit. The dimension illustrations in Chapter Two show the location of the
model number on each DIN size. Use the model number to determine which wiring diagrams to follow for
your limit. See Chapter Two for wiring details.
Step 3: Configure the Setup Page.
Setup Page parameters tell the limit what input
and output devices are wired to the limit and how it
should function. Without the proper Setup Page settings, the limit will not operate or could operate erratically. Since these settings require detailed knowledge
on the wiring and operation of the equipment, the
OEM or the designer normally programs these parameters. Some settings, such as the baud rate or device address, are Setup Page parameters, but would probably
be set by the end user.
These settings should be recorded for future reference. The settings can also be stored using the [Us;rS]
parameter, in the Factory Page. For saving and restoring parameters, see Chapter Eight, Features. For details on configuring the Setup Page, see Chapter Five,
Setup Page.
Step 4: Configure the Operations Page.
The Operations Page contains the parameters that
the equipment operator may need to set or change from
time to time. This includes limit and alarm set points.
In some cases the OEM manufacturer may set most of
these parameters because the equipment operates with
little variation (i.e., always the same limit and alarm
set points, always the same heat load). In equipment
where demands could vary significantly, the OEM may
leave parameter adjustments to the end user (i.e.,
many different temperature settings, different heat
loads).
The Operations Page on the Series SD limit is customizable so that only the parameters that the operator
may need to use will appear in the display. Settings
that won’t need to be adjusted can be hidden from the
operator, using the Programing Page. For more details
on the Programing Page, see Chapter Eight, Features.
For details on configuring parameters in the Operations Page, see Chapter Six, Operations Parameters
Tables.
Once you have verified the limit is operating properly, be sure to document all of your parameter settings.
Each parameter table has a settings column for you to
write in your values.
Watlow Series SD Limit ■ 4 ■ Chapter 2 Install and Wire
Install and Wire
2
1/16 DIN Series SD Limit Dimensions
RESET
Front
Side Back
RESET
1/32 DIN Series SD Limit Dimensions
Front Top
Back
Contact your local Greenlee supplier for the appropriate punch kit and
cutout tools required for rapid mounting.
Contact your local Greenlee supplier for the appropriate punch kit and
cutout tools required for rapid mounting.
30.7 mm
(1.21 in)
53.6 mm
(2.11 in)
RESET
12.7 mm
minimum
(0.50 in)
45.0 to 45.6 mm
(1.77 to 1.79 in)
Panel Cutout
Panel Thickness
1.5 to 9.5 mm
(0.060 to 0.375 in)
12.7 mm
(0.50 in)
minimum
22.2 to 22.5 mm
(0.87 to 0.89 in)
Model Number
Tabs with Teeth
0.48 mm (0.019 in) maximum gap between
controller front and customer front panel
100.9 mm
(3.98 in)
Ridges
Customer Front Panel
8.6 mm
(0.34 in)
47.2 mm
(1.86 in)
29.3 mm
(1.15 in)
52.1 mm
(2.05 in)
45.0 to 45.5 mm
(1.77 to 1.79 in)
100.2 mm
(3.95 in)
9.3 mm
(0.37 in)
50.1 mm
(1.97 in)
Panel Cutout
52.1 mm
(2.05 in)
RESET
7.9 mm
(0.31 in)
minimum
Panel Thickness
1.5 to 9.5 mm
(0.060 to 0.375 in)
13.7 mm
(0.54 in)
minimum
45.0 to 45.5 mm
(1.77 to 1.79 in)
Model Number
0.6 mm (0.025 in) maximum gap between
controller front and customer front panel
Customer Front Panel
59.2 mm
(2.33 in)
Watlow Series SD Limit ■ 5 ■ Chapter 2 Install and Wire
1/4 DIN Series SD Limit Dimensions
Model
Number
108.3 mm
(4.26 in)
108.8 mm
(4.28 in)
103.5 mm
(4.08 in)
9.6 mm
(0.38 in)
Customer Front Panel
0.5 mm (0.020 in) maximum gap between
controller front and customer front panel
RESET
Side
Back
Front
RESET
RESET
1/8 DIN Series SD Limit Dimensions
Back (horizontal)
Side (horizontal)
Front (vertical)
Back (vertical)
Front (horizontal)
Contact your local Greenlee supplier for the appropriate punch kit and
cutout tools required for rapid mounting.
Contact your local Greenlee supplier for the appropriate punch kit and
cutout tools required for rapid mounting.
99.8 mm
(3.93 in)
52.8 mm
(2.08 in)
97.8 mm
(3.85 in)
Model Number
RESET
minimum
7.9 mm
(0.31 in)
60.9 mm
(2.40 in)
92.0 to 93.0 mm
(3.62 to 3.65 in)
Panel Cutout
Panel Thickness
1.52 to 9.53 mm
(0.060 to 0.375 in)
31.8 mm
(1.25 in)
minimum
Model Number
45.0 to 45.6 mm
(1.77 to 1.79 in)
97.8 mm
(3.85 in)
99.8 mm
(3.93 in)
52.8 mm
(2.08 in)
RESET
Panel Cutout
31.8 mm
(1.25 in)
minimum
Panel Thickness
1.52 to 9.53 mm
(0.060 to 0.375 in)
45.0 to 45.6 mm
(1.77 to 1.79 in)
Dimensions for Horizontal or Vertical versions
100.2 mm
(3.95 in)
7.9 mm
(0.31 in)
minimum
92.0 to 93.0 mm
(3.62 to 3.65 in)
10.3 mm
(0.40 in)
60.9 mm
(2.40 in)
92.0 to 93.0 mm
(3.62 to 3.65 in)
Panel Cutout
Panel Thickness
1.52 to 9.53 mm
(0.060 to 0.375 in)
17.6 mm
(0.68 in)
minimum
16.0 mm
(0.63 in)
minimum
92.0 to 93.0 mm
(3.62 to 3.65 in)
99.8 mm
(3.93 in)
99.8 mm
(3.93 in)
RESET
Customer Front Panel
0.64 mm (0.025 in) maximum gap between
controller front and customer front panel
ç
Caution: Follow the installation procedure exactly to
guarantee a proper IP65/NEMA 4X seal. Make sure the
gasket between the panel
and the rim of the case is
not twisted and is seated
properly. Failure to do so
could result in damage to
equipment.
Watlow Series SD Limit ■ 6 ■ Chapter 2 Install and Wire
Installing and mounting
requires access to the
back of the panel.
Installing the 1/32 DIN Series SD Limit
1. Make the panel cutout using the mounting template dimensions in this chapter.
2. Check that the rubber gasket lies in its slot at the back of the bezel. Insert the
limit into the panel cutout.
3. While pressing the bezel firmly against the panel, slide the mounting bracket
over the back of the limit.
4. If the installation does not require an IP65/NEMA 4X seal, slide the bracket
up to the back of the panel enough to eliminate the spacing between the gasket and the panel.
For an IP65/NEMA 4X seal, use your thumb to lock the tabs into place while
pressing the limit from side to side. Don’t be afraid to apply enough pressure
to properly install the limit. If you can move it back and forth in the cutout,
you do not have a proper seal. The tabs on each side of the bracket have teeth
that latch into the ridges.
Each tooth is staggered at a different depth (from the front) so only one of the
tabs on each side is ever locked into the ridges at any time. Either the two
middle tabs or the two tabs diagonal from each other will be engaged.
5. If the matching tabs are not engaged, you do not have an IP65/NEMA 4X seal.
The space between the bezel and panel must be 0 to 0.48 mm (0 to 0.019 in)
maximum.
Removing the 1/32 DIN Series SD Limit
1. Remove the terminal cover and all of the wiring connectors from the back of
the limit.
2. Slide a thin, wide tool (putty knife) under all three mounting tabs, top then
bottom, while pushing forward on the back of the case. Be ready to support
the limit as it slides out of the panel cutout.
Tools required:
Putty knife or equivalent
Arrows indicate the
direction of pull to
remove the
connectors.
Mounting
Bracket
Panel
Mounting Tab
Mounting Ridge
Gasket
Bezel
Case
IP65/NEMA 4X
Seal Example
Watlow Series SD Limit ■ 7 ■ Chapter 2 Install and Wire
Installing the 1/16 DIN Series SD Limit
1. Make the panel cutout using the mounting template dimensions in this chapter.
2. Check that the rubber gasket lies in its slot at the back of the bezel. Insert the
limit into the panel cutout. Slide the retention collar over the limit, with the
locating holes on the top and bottom, facing the back of the limit.
3. Slide the mounting bracket over the back of the limit with the screw tips
pointed toward the panel, aligning with the locating holes in the retention collar. Push it gently but firmly over the limit until the hooks snap into the slots
at the front.
4. If the installation does not require an IP65/NEMA 4X seal, tighten the two
screws with the Phillips screwdriver just enough to eliminate the spacing between the rubber gasket and the panel.
For an IP65/NEMA 4X seal, tighten the two screws until the gap between the
bezel and panel surface is 0.6 mm (0.024 in) maximum. Make sure that you
cannot move it back and forth in the cutout. If you can, you do not have a
proper seal. Do not over-tighten. Over-tightening could damage the mounting
bracket.
Removing the 1/16 DIN Series SD Limit
1. Remove the terminal cover and all of the wiring connectors from the back of
the limit. While supporting the limit with one hand, use the Phillips screwdriver to unscrew the two screws on the mounting bracket until the tips are
flush or past the end of the hooks.
2. Squeeze the two screws together on the mounting bracket to release the hooks
from the slots and slide it off. Remove the retention collar and push the limit
out of the panel cutout. Be ready to support the limit as it comes through the
front panel.
Gasket
Bezel
Panel
Retention
Collar
Mounting
Bracket
Slot
Case
Locating Hole
Arrows indicate the
direction of pull to
remove the
connectors.
Hook
ç
Caution: Follow the installation procedure exactly to
guarantee a proper IP65/NEMA 4X seal. Make sure the
gasket between the panel
and the rim of the case is
not twisted and is seated
properly. Failure to do so
could result in damage to
equipment.
Note: Be careful not to overtighten the screws. This may
cause the mounting bracket
to fail. If the front bezel is
touching the front panel, the
mounting bracket is too
tight.
Installing and mounting
requires access to the
back of the panel.
Tools required:
one #2 Phillips screwdriver
Tools required:
one #2 Phillips screwdriver.
ç
Caution: Follow the installation procedure exactly to
guarantee a proper IP65/NEMA 4X seal. Make sure the
gasket between the panel
and the rim of the case is
not twisted and is seated
properly. Failure to do so
could result in damage to
equipment.
Note: Be careful not to overtighten the screws. This may
cause the mounting bracket
to fail. If the front bezel is
touching the front panel, the
mounting bracket is too
tight.
Installing the 1/8 DIN Series SD Limit
1. Make the panel cutout using the mounting template dimensions in this chapter.
2. Check that the rubber gasket lies in its slot at the back of the bezel. Insert the
limit into the panel cutout. Slide the retention collar over the limit, with the
locating holes facing the back of the limit.
3. Slide the mounting bracket over the back of the limit with the screw tips
pointed toward the panel, aligning with the locating holes in the retention collar. Push it gently but firmly over the limit until the hooks snap into the slots
at the front.
4. If the installation does not require an IP65/NEMA 4X seal, tighten the four
screws with the Phillips screwdriver just enough to eliminate the spacing between the rubber gasket and the panel.
For an IP65/NEMA 4X seal, tighten the four screws until the gap between the
bezel and panel surface is 0.5 mm (0.020 in) maximum. Make sure that you
cannot move it back and forth in the cutout. If you can, you do not have a
proper seal. Do not over-tighten. Over-tightening could damage the the mounting bracket.
Removing the 1/8 DIN Series SD Limit
1. Remove the terminal cover and all of the wiring connectors from the back of
the limit. Using the Phillips screwdriver, unscrew the four screws on the
mounting bracket until they disengage from the retention collar.
2. Squeeze the release tabs on the long sides of the mounting bracket and slide
the mounting bracket off the back of theLimit. Remove the retention collar
and push the limit out of the panel cutout. Be ready to support the limit as it
comes through the front panel.
Watlow Series SD Limit ■ 8 ■ Chapter 2 Install and Wire
Installing and mounting
requires access to the
back of the panel.
Tools required:
one #2 Phillips screwdriver.
Tools required:
one #2 Phillips screwdriver.
Panel
Retention
Collar
Mounting
Bracket
Arrows indicate the
direction of pull to
remove the
connectors.
Case
Gasket
Bezel
Locating Hole
Slot
Hook
Release
Ta b
ç
Caution: Follow the installation procedure exactly to
guarantee a proper IP65/NEMA 4X seal. Make sure the
gasket between the panel
and the rim of the case is
not twisted and is seated
properly. Failure to do so
could result in damage to
equipment.
Note: Be careful not to overtighten the screws. This may
cause the mounting bracket
to fail. If the front bezel is
touching the front panel, the
mounting bracket is too
tight.
Installing the 1/4 DIN Series SD Limit
1. Make the panel cutout using the mounting template dimensions in this
chapter.
2. Check that the rubber gasket lies in its slot at the back of the bezel. Insert the
limit into the panel cutout. Slide the retention collar over the limit, with the
locating holes facing the back of the limit.
3. Slide the mounting bracket over the back of the limit with the screw tips
pointed toward the panel, aligning with the locating holes in the retention collar. Push it gently but firmly over the limit until the hooks snap into the slots
at the front.
4. If the installation does not require an IP65/NEMA 4X seal, tighten the four
screws with the Phillips screwdriver just enough to eliminate the spacing between the rubber gasket and the panel.
For an IP65/NEMA 4X seal, tighten the four screws until the gap between the
bezel and panel surface is 0.5 mm (0.020 in) maximum. Make sure that you
cannot move it back and forth in the cutout. If you can, you do not have a
proper seal. Do not over-tighten. Over-tightening could damage the mounting
bracket.
Removing the 1/4 DIN Series SD Limit
1. Remove the terminal cover and all of the wiring connectors from the back of
the limit. Using the Phillips screwdriver, unscrew the four screws on the
mounting bracket (two on top, two on bottom) until they disengage from the
retention collar.
2. Slide the tip of a flat screwdriver between the limit and the center top side of
the mounting bracket. Rotate the screwdriver 90 degrees, stretching the
bracket away from the limit so the hooks on the bracket disengage from the
slots. Hold the bracket and press the limit forward slightly to prevent the disengaged hooks from snapping back into the slots.
3. Repeat this operation to disengage the hooks on the bottom side of the mounting bracket.
4. Press with one or two fingers on the lower half of the back of the unit so that
the limit slides forward toward the panel. Hold the bracket steady; do not pull
back. Be ready to support it as it comes through the front panel.
Watlow Series SD Limit ■ 9 ■ Chapter 2 Install and Wire
Installing and mounting
requires access to the
back of the panel.
Tools required:
one #2 Phillips screwdriver
Tools required:
• one #2 Phillips screwdriver
• one flat-head screwdriver
Retention
Collar
Mounting
Bracket
Arrows indicate the
direction of pull to
remove the
connectors.
Panel
Hook
Slot
Locating Hole
Gasket
Bezel
Case
Watlow Series SD Limit ■ 10 ■ Chapter 2 Install and Wire
Figure 10e — 1/4 DIN
(S D 4 L - _ J__ -__ _ _).
Figure 10b — 1/16 DIN
(S D 6 L - _ J _ _ - _ _ _ _).
Figure 10d — 1/8 DIN Vertical
(S D 8 L - _ J _ _ - _ _ _).
Figure 10c — 1/8 DIN Horizontal
(S D 9 L - _ J _ _ - _ _ _ _).
Series SD Family — Back Views in Scale
NOTE:
Terminals 12, 13 and 14
are not installed on controllers without an output 3
(SD _ L-_ J _ A-_ _ _ _).
Figure 10a — 1/32 DIN
(S D 3 L - _ J _ _ - _ _ _ _).
NOTE: The SD model number determines which diagram applies to your unit.
234
1
56
89
10 11
8
9
10 11
1
2
3
4
56
12
13
14
8
9
10 11
1
2
3
4
56
12
13
14
8
9
10 11
1
2
3
4
56
12
13
14
8
9
10 11
1
2
3
4
56
12
13
14
Watlow Series SD Limit ■ 11 ■ Chapter 2 Install and Wire
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
Ó
WARNING: If high voltage is applied to a low-voltage limit, irreversible damage will occur.
Wiring the Series SD
The model number for each output option appears with its wiring diagram. Check the label on the limit and compare your model number to those
shown here and to the model number breakdown in the Appendix of this
manual.
The connectors on the back of the Series SD are different for different
model numbers.
All outputs are referenced to a de-energized state.
All wiring and fusing must conform to the National Electric Code and to
any locally applicable codes as well.
Figure 11a — High Voltage AC Power Wiring
SD_ L - H J _ _ - _ _ _ _ High
• Nominal voltage: 100 to 240VÅ (ac)
Figure 11b — Low Voltage AC Power Wiring
SD_ L - L J _ _ - _ _ _ _ Low
• Nominal voltage: 24‡ (ac/dc)
• Class 2 power source required for agency compliance
Isolation Blocks
There are no electrical connections between these blocks.
Relay outputs (mechanical and solid-state) provide isolation through their
relay contacts. Each relay output is isolated from the blocks above and is
isolated from other relay outputs.
Sensor Input
Switched DC Outputs
Analog Process Outputs
Power Supply Input EIA/TIA-485 Communi-
cations Input
L1
L2
1
2
1
2
3
+
1
2
-
1
2
3
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Spring clamp wiring connector
note:
To insert the wire, push the wire
into the desired connection number, and it should automatically
lock into place. To remove the
wire, press and hold the orange
release tab with a small screwdriver. Pull the wire out of the
connection. Solid or tinned wire
recommended.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
ç
WARNING: Process input may
not have sensor break protection. Outputs can remain full on.
Check your input settings.
Watlow Series SD Limit ■ 12 ■ Chapter 2 Install and Wire
Figure 12a — Thermocouple Input
(all model numbers)
Thermocouples are polarity sensitive. The negative lead (usually red) must be
connected to terminal 11.
• Input impedance: >20 MΩ
Figure 12b — RTD Input (100 Ω DIN curve 0.00385 Ω/Ω/°C)
(all model numbers)
Terminals 8 and 11 must be shorted for a two-wire RTD. For three-wire RTDs,
the S1 lead (usually white) must be connected to terminal 10.
• Nominal excitation current: 390 µA
Figure 12c — 0 to 10V
ÎÎ
(dc) Process Input
(all model numbers)
• Input impedance 20 kΩ, dc only.
Figure 12d — 0 to 50mV
ÎÎ
(dc) Process Input
(all model numbers)
• Input impedance >20 MΩ, dc only.
3-wire RTD
2-wire RTD
6
8
9
+10
-11
10 11
6
S2 8
S1 10
11
S2 8
S1 10
S3 11
8
9
10 11
6
8
9
10 11
+
-
9
11
+
10
-
11
6
8
9
10 11
6
8
9
10 11
Watlow Series SD Limit ■ 13 ■ Chapter 2 Install and Wire
Figure 13a — 4 to 20 mA Process Input
(all model numbers)
• Input impedance 100 Ω, dc only.
• Limit does not supply power for the current loop.
Figure 13b — Output 1 Mechanical Relay
SD_ L - _ J _ _ - _ _ _ _
• 2 A, Form A.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• See Quencharc note.
• For use with ac or dc.
• Minimum load current 10 mA
• Output does not supply power.
Figure 13c — Output 2 Mechanical Relay
SD_ L - _ _ J _ - _ _ _ _
• 2 A; Form A.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• See Quencharc note.
• For use with ac or dc.
• Minimum load current: 10 mA
• Output does not supply power.
ç
WARNING: Process input may
not have sensor break protection. Outputs can remain full on.
Check your input settings.
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Quencharc Note:
Switching inductive loads (relay
coils, solenoids, etc.) with the
mechanical relay, switched dc or
solid-state relay output options
requires use of an R.C. suppressor.
Watlow carries the R.C. suppressor Quencharc brand name,
which is a trademark of ITW
Paktron. Watlow Part No. 08040147-0000.
Spring clamp wiring connector
note:
To insert the wire, push the wire
into the desired connection number, and it should automatically
lock into place. To remove the
wire, press and hold the orange
release tab with a small screwdriver. Pull the wire out of the
connection. Solid or tinned wire
recommended
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
6
+
8
11
-
8
9
10 11
4
common 5
normally open 6
56
COM.
N.O.
Mechanical Relay
5
6
Internal Circuitry
Mechanical Relay
3
COM.
N.O.
4
Internal Circuitry
3
common
normally open
4
2
3
4
Watlow Series SD Limit ■ 14 ■ Chapter 2 Install and Wire
Figure 14a — Output 2 Solid-state Relay
SD_ L - _ _ K _ - _ _ _ _
• 0.5 A maximum, Form A.
• 24 to 240VÅ (ac).
• See Quencharc note.
• Minimum load current 10mA
• Maximum leakage current 100µA
• Not for use with direct current (dc).
• Output does not supply power...
Figure 14b — Output 2 Switched DC
SD_ L - _ _ C _ - _ _ _ _
• Maximum supply current 30 mAÎ (dc).
• Supply voltage 6 to 12VÎ (dc).
• Not recommended for switching mechanical relays.
• Output supplies power.
Figure 14c — Output 2 EIA/TIA-485
SD_ L - _ _ U _ - _ _ _ _
• Isolated [50VÎ (dc)]
• Half duplex
• For more communications information, see the Features chapter.
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Quencharc Note:
Switching inductive loads (relay
coils, solenoids, etc.) with the
mechanical relay, switched dc or
solid-state relay output options
requires use of an R.C. suppressor.
Watlow carries the R.C. suppressor Quencharc brand name,
which is a trademark of ITW
Paktron. Watlow Part No. 08040147-0000.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
2
3
common
normally open
4
3
4
Solid-state Relay
Solid-state Switch
3
COM.
4
N.O.
Internal Circuitry
3
4
-
dc+ 3
dc- 4
+
2
Load
3
4
Switched DC
6 to 12V (dc)
dc+
dc-
Internal Circuitry
2
T+/R+ 3
T-/R- 4
3
4
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Quencharc Note:
Switching inductive loads (relay
coils, solenoids, etc.) with the
mechanical relay, switched dc or
solid-state relay output options
requires use of an R.C. suppressor.
Watlow carries the R.C. suppressor Quencharc brand name,
which is a trademark of ITW
Paktron. Watlow Part No. 08040147-0000.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
Figure 15a — Output 3 Mechanical Relay
SD_ L - _ _ _ E - _ _ _ _
• 5 A; Form C.
• 240VÅ (ac) maximum.
• 30VÎ (dc) maximum.
• See Quencharc note.
• For use with ac or dc.
• Minimum load current: 10 mA
• Output does not supply power.
Figure 15b — Output 3 Solid-state Relay
SD_ L - _ _ _ K - _ _ _ _
• 0.5 A maximum, Form A.
• 24 to 240VÅ (ac).
• See Quencharc note.
• Minimum load current 10 mA
• Maximum leakage current 100 µA
• Not for use with direct current (dc).
• Output does not supply power.
Figure 15c — Output 3 Switched DC
SD_ L - _ _ _ C - _ _ _ _
• Maximum supply current 30 mAÎ (dc).
• Supply voltage 6 to 12VÎ (dc).
• Not for switching mechanical relays.
• Output supplies power.
Watlow Series SD Limit ■ 15 ■ Chapter 2 Install and Wire
Mechanical Relay
12
12 common
13
13 normally open
14
14 normally closed
Internal Circuitry
COM.
N.O.
N.C.
12
13
14
12
12 common
13
13 normally open
14
Switched DC
6 to 12V (dc)
12
12 dc +
13
13 dc -
14
14 common
Internal Circuitry
Solid-state Relay
Solid-state Switch
COM.
N.O.
Internal Circuitry
dc+
12
dc-
13
12
13
+
-
Load
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this limit
to a power source and to electrical sensors or peripheral devices. Failure to do so may result in damage to equipment and
property, and/or injury or loss of
life.
Quencharc Note:
Switching inductive loads (relay
coils, solenoids, etc.) with the
mechanical relay, switched dc or
solid-state relay output options
requires use of an R.C. suppressor.
Watlow carries the R.C. suppressor Quencharc brand name,
which is a trademark of ITW
Paktron. Watlow Part No. 08040147-0000.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when using
switched DC or analog process
outputs.
Figure 16a — Output 3 Open Collector
SD_ L - _ _ _ C - _ _ _ _
• Maximum current sink 250 mAÎ (dc).
• Maximum supply voltage 42VÎ (dc).
• For inductive loads, see Quencharc note.
• Output does not supply power.
Figure 16b — Output 3 Process
SD_ L - _ _ _ F - _ _ _ _
• Analog output scalable from 0 to 10VÎ (dc) or 0 to 20 mAÎ (dc).
• Load capability: voltage, 1 kΩ minimum; current, 800 Ω maximum.
• Output supplies power.
• Cannot use voltage and current output at the same time.
Watlow Series SD Limit ■ 16 ■ Chapter 2 Install and Wire
Class 2 power source
12
12 dc+
13
13 open collector
14
14 common
Open Collector
42V (dc) maximum
dc+
dc-
COM.
Internal Circuitry
required for agency
compliance.
12
13
14
Power
Supply
+
-
+
Load
-
12
12 amps +
13
13 volts +
14
14 com -
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