Watlow LV Operating Manual

Registered Company

Winona, Minnesota USA

ISO 9001

Series L

User’s Manual

0600-0044-0001

Series L - Temperature Limit

TOTAL

CUSTOMER

SATISFACTION

3 Year Warranty

1241 Bundy Boulevard., Winona, Minnesota USA 55987

Phone: [phone], Fax: [phone] http://www.watlow.com

Rev. H Made in the U.S.A.

February 2015

ç

CAUTION or

WARNING

Safety Information

We use note, caution and warning symbols throughout this book to draw your attention to
important operational and safety information.

A “NOTE” marks a short message to alert you to an important detail.

A “CAUTION” safety alert appears with information that is important for protecting your
equipment 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 and equipment from damage. Pay very close attention to all warnings that apply to your
application.

The safety alert symbol, ç (an exclamation point in a triangle) precedes a general CAUTION
or WARNING statement.

The electrical hazard symbol, Ó (a lightning bolt in a triangle) precedes an electric shock haz­ard CAUTION or WARNING safety statement.

Ó

Electrical

Shock Hazard

CAUTION or WARNING

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, you can get technical assistance from your local Watlow rep­resentative (see back cover), by e-mailing your questions to [e-mail] or by
dialing [phone] 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 • System wiring information

• Series L Limit User’s Manual

Warranty

These controllers are manufactured by ISO 9001-registered processes and are backed by a
three-year warranty.

Return Material Authorization (RMA)

1. Call Watlow Customer Service, [phone], for a Return Material Authorization (RMA)
number before returning any item for repair. We need this information:

• Ship to address • Bill to address

• Contact name • Phone number

• Method of return shipment • Your P.O. number

• 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 needed
when returning any unused product for credit. Make sure the RMA number is on the out
side of the carton, and on all paperwork returned. Ship on a Freight Prepaid basis.

3. After we receive your return, we will examine it and try to verify the reason for the return.

4. In cases of manufacturing defect, we will enter a repair order, replacement order or issue
credit for material returned.

5. To return products that are not defective, goods must be be in new condition, in the origi­ nal 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 not repairable, it will be returned to you with a letter of explanation.

7. Watlow reserves the right to charge for no trouble found (NTF) returns.

The Series L Limit user’s manual is copyrighted by Watlow Electric Manufacturing, © February
2015 with all rights reserved.

1

Overview

Series LF and LV

Watlow's temperature limit controllers* provide an
economical limit controller solution for applications
where thermal system protection is needed.

A limit controller is added to applications to prevent
over or under temperature conditions. The limit pro­vides safety assurances against instances where a
thermal runaway condition occurs as a result of a
failed sensor, controller or output device.

The LF and LV limit controllers are recommended for
any application where thermal system runaway could
result in large product scrap costs, damage to system
equipment, potential fire hazard or risk to personnel.
Both controllers are Factory Mutual and CSA ap­proved.

The LF and LV controllers are available with or with­out an operator interface and can be ordered in square
1/8th DIN panel mount, din rail mount, open board or
potted module design configurations. Push-on, quick
connect spade terminal or removable screw clamp style
terminal block ordering options provide the electrical
connections.

The microprocessor design platform provides improve­ments in the performance, repeatability, and accuracy
offered by Watlow's current line of basic control prod­ucts.

The Series LV includes an operator interface to allow
viewing and selection of the limit set point. A red four
character, seven-segment LED displays the limit set
point. The limit set point selection is made with a con­tinuous turn, velocity-sensitive rotary encoder. Push-to­Set operation reduces accidental limit set point adjust­ments. Limit set point operating range temperature
values are customer definable in the product configu­ration part number.

The Series LF offers fixed limit set points. These units
are supplied without an operator interface. Limit set
point temperature values are customer definable in
the product configuration part number.

The features and performance of the LF and LV con­trollers make them ideally suited for a wide range of
industrial limit control applications in the food prepa­ration, industrial machinery, packaging and plastic
markets.

II with Class B Software review. It provides increased
safety due to the use of Factory fixed set point, Factory
fixed hysteresis and the use of redundant tempera­ture sensors to protect against a single point sensor
failure. Either sensor can initiate an over temperature
limit condition along with a deviation between sensors
greater than the process comparison value. The unit
cannot be reset until both sensors are below the Limit
Temperature minus the hysteresis value. A power cycle
is then needed to reset the control.

Definitions under UL/EN 60730-1 , 60730-2-9

Protective - Intended to provide safety or protective
functionality. A control the operation of which is in­tended to prevent a hazardous situation during abnor­mal operation of the equipment

Type 2 Action - Calibration Verification Testing or
Functionality Verification testing conducted.

A Type ".B" control has been investigated for "micro­disconnection" applications. Disconnection of any pole
(ungrounded conductor is not specified) for functional
purposes.

A Type ".K" control is designed that in the event
of a break in the SENSING ELEMENT, or in any
other part between the SENSING ELEMENT and
the SWITCH HEAD, the declared disconnection is
provided before the declared OPERATING VALUE ,
OPERATING TIME or OPERATING SEQUENCE is
exceeded.

THERMAL CUT-OUT - UL60730 Par 2.2.8. A Tem­perature Cut-out in accordance with UL60730 is de­fined as temperature sensing control intended to keep
a temperature below or above one particular value
during abnormal operating conditions and which has
no provision for setting by the user. A UL60730 THER­MAL CUT-OUT is similar to a UL873 Temperature
Limiting control.

Class B - software that includes code intended to pre­vent unsafe state in appliance.

All Watlow Series L limit controllers include industry­leading service, support and a 3-year warranty.

*Also available, Series C, an on-off temperature con­troller version.

Series LS

This control meets the newest safety standard require­ments for the food service industry UL/EN 60335
equipment. It is approved to UL/EN 60730-1 and
60730-2-9 Electronic Control Thermal Cut-out Class

Watlow Series L • 1 • Chapter 1: Overview

LV and LF Features and Benefits

Four-Character LED Display

• Improves limit set point adjustment accuracy.

Fixed or Adjustable Limit Set Points

• Tamper proof operation.

• Control flexibility.

Set Point Adjustment Opetions

• Rotary encoder.

• Tactile increment and decrement keys.

Push to Set

• Reduce accidental limit set point adjustments.

Multiple Mounting Options

• Minimizes installation time.

High or Low Limit Operation

• Application flexibility.

Fahrenheit or Celsius Operation with Indication

• Application flexibility.

Sensor Break Protection

• Provides positive system shutdown.

Agency Approvals

• Meets requirements for agency certification.

• NEMA 4X/IP65 seal panel mount versions avail-

able.

• W.E.E.E.; CE; RoHS

Micro Processor Based Technology

• Accurate and repeatable protection.

Stock to Four-Day Delivery

LS Features and Benefits

Dual channel sensors

• Detects sensor faults

• Fault tolerant design

• Firmware review

• Sensor deviation error, sensor placement errors

Fail Safe Design

• Internal or external faults cause product to shut­down in a safe manner

Watlow Series L • 2 • Chapter 1: Overview

61.7 mm

2

Designation

Installation

Installing the Open Board Controller (LF and LV)

61.7 mm
(2.43 in)

Use M2.5 (#4) mounting

hardware, not included

55.9 mm
(2.20 in)

61.7 mm
(2.43 in)

56.3 mm
(2.22 in)

Terminal Designation Sticker

Spade Terminal Model

SWDC+

SWDC-

COM

.6

N.O.

.7

.8

N.C.

.9

L2

.10

L1

45.07 mm
(1.775 in)

61.7 mm

55.9 mm

(2.43 in)

(2.20 in)

Use M2.5 (#4) mounting

hardware, not included

(2.43 in)

56.3 mm
(2.22 in)

Screw Terminal Model

Figure 3a

1. Locate and drill four 3.2 mm (0.125 in) holes in the desired panel location.
See Figure 3a for hole locations.

2. Mount the controller using four M2.5 (#4) screws.

Installing the Potted Controller
(LF, LV) (LS)

35.1 mm
(1.38 in)

70.1 mm
(2.76 in)

Terminal Designation Sticker

46.6 mm
(1.84 in)

35.1 mm
(1.38 in)

35.1 mm
(1.38 in)

70.1 mm
(2.76 in)

Terminal Designation Sticker

LED

45.07 mm
(1.775 in)

35.1 mm
(1.38 in)

Limit

Range

102.9 mm

Te rminal

Sticker

(4.05 in)

88.9 mm
(3.50 in)

Use [3.5M] #6 hardware,

not included

102.9 mm
(4.05 in)

88.9 mm
(3.50 in)

Terminal

Designation

Sticker

Terminal Designation Sticker

Use [3.5M] #6 hardware,

not included

Figure 3b

1. Drill two 5 mm (0.187 in) diameter holes in the desired panel location. See Figure 3b for hole locations.

2. Mount the controller using two M3.5 (#6) screws.

Watlow Series L • 3 • Chapter 2: Installation

Installing the DIN Rail Mount Controller

94.7 mm

Agency Label

(3.73 in)

90.7 mm
(3.57 in)

1.

SW-1

2.

SW-2

3.

TC-/S1

4.

TC+/S2

5.

S3

78.1 mm
(3.08 in)

39.1 mm
(1.54 in)

Panel mounting the bracket requires
two M3.5 (#6) screws, not included

Part Number Label

101.6 mm
(4.00 in)

80.3 mm

112.3 mm

(3.16 in)

(4.42 in)

To install, press in here.

To remove, pull out here.

See Mounting/Removing the

DIN Rail Controller procedures below.

Spade Terminal Model

Figure 4a

Sub-Panel Mounting

1. Using the controller as a location template, mark
both mounting holes.

2. Drill and tap two 2.7 mm (0.106 in) diameter
holes in the desired panel location. See Figure
4a above for hole locations.

3. Mount the controller using two M3.5 (#6) screws.

81.8 mm

To install or remove,
press down here.
See Installing/ Removing
the DIN Rail Controller
procedures below.

DIN rail, upper
mounting clip

35 mm x 7.5 mm

DIN rail is not included

with the assembly

Terminal Designation Sticker

Screw Terminal Model

(3.22 in)

80.0 mm
(3.07 in)

Tactile Key Model

3. Remove the DIN rail bracket from the DIN rail.

4. Insert a flat blade screwdriver between the DIN
rail bracket and the case. Rotate the screwdriver
to release the DIN rail bracket hooks from the
ridges on the case, while firmly pushing the con­troller out the front of the DIN rail bracket. Al­ternate back and forth between the top and then
the bottom. Be sure to support the controller as it
comes out of the bracket. See Figure 4b.

DIN Rail Mounting

1. Place the DIN rail upper mounting clip on the top
edge of the DIN rail. See Figure 4a. DIN rail
spec, DIN 50022, 35 mm x 7.5 mm (1.38 in x 0.30
in).

2. Press down firmly on the top back edge of the DIN
rail bracket and push in on the bottom, front edge
of the bracket. The controller snaps securely onto
the rail. See Figure 4a. If the controller does
not snap on, check to see if the DIN rail is bent.
Minimum clipping distance is 34.8 mm (1.37 in),
the maximum is 35.3 mm (1.39 in).

Removing the DIN Rail Controller

1. Remove power from the system.

2. Remove all the wiring connections from the back
of the controller.

3. While pressing down on the top, back edge of the
DIN rail bracket, pull forward on the bottom, front
edge of the DIN rail bracket. See Figure 4a.

Removing the Controller from the DIN
Rail Bracket

1. Remove power from the system.

2. Remove all the wiring connections from the back
of the controller.

Press forward
with thumb.

Insert at blade screw­driver here.

Figure 4b

ç Caution: FM approval requires limit switches to be suit-

ably enclosed to restrict casual user adjustment.

Watlow Series L • 4 • Chapter 2: Installation

72.4 mm
(2.85 in)

68.0 mm
(2.68 in)

72.4 mm
(2.85 in)

19.1 mm
(0.75 in)
minimum

84.5 mm square
(3.33 in)

Panel Cutout

Panel Thickness

1.52 to 3.18 mm

(0.060 to 0.125 in)

19.1 mm
(0.75 in)
minimum

68.0 mm
(2.68 in)

Customer Front Panel

Terminal Blocks Locations
on Screw Terminal Models

Spade Terminal Model

Part Number Label

6.4 mm

(0.25 in)

Tactile Key,

Spade Terminal Model

19.2 mm
(0.76 in)

Screw Terminal Model

Figure 5

Installing the Square 1/8 DIN Panel
Mount Controller

1. Make the panel cutout using the mounting dimen­sions above.

2. Remove mounting bracket from the back of the
controller.

3. If your controller has a gasket, check to see that
the gasket is not twisted, and is seated within the
case bezel flush with the panel. Place the case in
the cutout. Make sure the gasket is between the
panel cutout and the case bezel.

4. While pressing the front of the case firmly against
the panel, slide the mounting collar over the back
of the control. The tabs on the collar must line up
with the mounting ridges on the case for secure

Mounting Bracket

51.7 mm
(2.04 in)

Contact your local Greenlee supplier for the appropriate
punch kit and cutout tool for rapid mounting.

Screw Terminal Models

installation. See Figure 4. Slide the collar firmly
against the back of the panel, getting it as tight
as possible. To ensure a tight seal, use your thumb
to lock the tabs into place while pressing the case
from side to side. Don’t be afraid to apply enough
pressure to install the controller. The tabs on
each side of the collar have teeth that latch into
the ridges. Each tooth is staggered at a different
height, so only one of the tabs on each side are
ever locked into the ridges at a time. Confirm that
the tabs on one side of the collar correspond with
those on the opposite side. Make sure the two cor­responding tabs are the only ones locked in the
ridges at the same time. If the corresponding tabs
are not supporting the case at the same time, you
will not have a NEMA 4X seal.

5. Insert the control chassis into its case and press
the bezel to seat it. Make sure the inside gasket

Watlow Series L • 5 • Chapter 2: Installation