Walton C Series User manual

0600-0044-0000 Rev. E Made in the U.S.A.
February 2008 $5.00
User’s Manual
Registered Company
Winona, Minnesota USA
ISO 9001
ISO 9001
TOTAL
3 Year Warranty
CUSTOMER
CUSTOMER
SATISFACTION
SATISFACTION
Series C & Series TM
Series C - On-Off Temperature Controller
Series TM - Temperature Indicator
1241 Bundy Boulevard., Winona, Minnesota USA 55987
Phone: [phone], Fax: [phone] http://www.watlow.com
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Safety Information
We use note, caution and warning symbols throughout this book to draw your atten-
tion 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 cau-
tions that apply to your application.
A “WARNING” safety alert appears with information that is important for protect-
ing you, others and equipment from damage. Pay very close attention to all warn-
ings 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.
Technical Assistance
If you encounter a problem with your Watlow controller, review your configuration informa-
tion 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 rep-
resentative (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
• Basic Controller 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 outside 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 unrepairable, 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 C and Series TM user’s manual is copyrighted by Watlow Winona, Inc.,
© November 2006 with all rights reserved.
ç
CAUTION or
WARNING
Ó
Electrical
Shock Hazard
CAUTION or WARNING
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Watlow Series C/TM • 1 • Chapter 1 Overview
Watlow's Series C family of basic temperature con-
trollers* provide an economical controller solution for
applications where simple on/off control is needed.
These 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 pot-
ted module design configurations. Push-on, quick con-
nect spade terminal or removable screw clamp style
terminal block ordering options provide the electrical
connections.
The microprocessor design platform provides im-
provements in the performance, repeatability, and
accuracy offered by Watlow's current line of basic tem-
perature control products.
The Series CV includes an operator interface to al-
low viewing and selection of the control set point. A
red four-character, seven-segment LED displays the set
point. It is also available with a push-to-show process
option. The set point selection is made with a continu-
ous turn, velocity-sensitive rotary encoder. Set point
range temperature values are customer definable in
the product configuration part number.
The Series CF offers fixed control points. These
units are supplied without an operator interface. Oper-
ating set point temperature values are customer defin-
able in the product configuration part number.
The Series TM is a temperature indicator only ver-
sion. It is available in DIN rail or panel mount configu-
rations.
The features and performance of these products
make them ideally suited for a wide range of industrial
control applications in the food preparation, industrial
machinery, packaging and plastic markets.
Watlow's Series C and TM controllers include in-
dustry-leading service, support and a 3-year warranty.
*Also available in an FM-approved limit version.
Features and Benefits
Four-Character LED Display
• Improves Set Point adjustment accuracy.
Fixed or Adjustable Set Points
• Tamper Proof Operation.
• Control Flexibility.
Set Point Adjustment Options
• Rotary encoder.
• Tactile increment and decrement keys.
Push to Set Option
• Reduce accidental set point adjustments.
Push to Display Process Option
• Allows viewing of process value.
Multiple Mounting Options
• Minimizes installation time.
Heat or Cool 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
Microprocessor Based Technology
• Accurate and repeatable control.
Stock to Four Day Delivery
Overview
1
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Watlow Series C • 2 • Chapter 2 Installation
Installing the Open Board Controller
S
p
ade Terminal Model
61.7 mm
2.43 in 55.9 mm 2.20 in
Use M2.5 (#4) mounting
hardware, not included
56.3 mm
2.22 in
61.7 mm
2.43 in
45.07 mm
1.775 in
Terminal Designation Sticker
Terminal Designation Sticker
61.7 mm
2.43 in 55.9 mm 2.20 in
56.3 mm
2.22 in
61.7 mm
2.43 in
Use M2.5 (#4) mounting
hardware, not included
45.07 mm
1.775 in
.6
.7
.8
.9
.10
SWDC+
N.O.
SWDC-
COM
N.C.
L2
L1
Screw Terminal Model
Figure 2a
1. Locate and drill four 3.2 mm (0.125 in) holes in the desired panel location. See Figure 2a for hole locations.
2. Mount the controller using four M2.5 (#4) screws.
Installing the Potted Controller
70.1 mm
2.76 in
35.1 mm
1.38 in
88.9 mm
3.50 in
Terminal Designation Sticker
Use [3.5M] #6 hardware,
not included
35.1 mm
1.38 in
46.6 mm
1.84 in
Terminal Designation Sticker
102.9 mm
4.05 in
Terminal Designation Sticker
Figure 2b
1. Drill two 5 mm (0.187 in) diameter holes in the desired panel location. See Figure 2b for hole locations.
2. Mount the controller using two M3.5 (#6) screws.
2Installation
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Watlow Series C • 3 • Chapter 2 Installation
Figure 3a
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 3a
above for hole locations.
3. Mount the controller using two M3.5 (#6) screws.
DIN Rail Mounting
1. Place the DIN rail upper mounting clip on the top
edge of the DIN rail. See Figure 3a. 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 3a. If the controller does not
snap on, check to see if the DIN rail is bent. Mini-
mum 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 3a.
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.
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 3b.
Figure 3b
Insert flat blade
screwdriver here
Press forward
with thumb
Spade Terminal Model
SW-1
SW-2
TC-/S1
TC+/S2
S3
Screw Terminal Model
78.1 mm
(3.08 in)
39.1 mm
(1.54 in)
Panel mounting the bracket requires
two M3.5 (#6) screws, not included
To install, press in here.
To remove, pull out here.
See Mounting/Removing the
DIN Rail Controller procedures below.
80.3 mm
(3.16 in)
101.6 mm
(4.00 in)
112.3 mm
(4.42 in)
94.7 mm
(3.73 in)
90.7 mm
(3.57 in)
Part Number Label
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
Agency Label
81.8 mm
(3.22 in)
80.0 mm
(3.07 in)
1.
2.
3.
4.
5.
Tactile Key Model
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Watlow Series C • 4 • Chapter 2 Installation
Figure 4
Installing the Square 1/8 DIN Panel Mount
Controller
1. Make the panel cutout using the mounting dimen-
sions above.
2. Remove mounting bracket from the back of the con-
troller.
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 instal-
lation. 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 in-
stall the controller. The tabs on each side of the col-
lar 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 is also
seated properly and not twisted. The hardware in-
stallation is complete. Proceed to the wiring section.
Terminal Blocks Locations
on Screw Terminal Models
Spade Terminal Model
Contact your local Greenlee supplier for the appropriate
punch kit and cutout tool for rapid mounting.
Screw Terminal Models
Spade Terminal Model
72.4 mm
(2.85 in)
72.4 mm
(2.85 in)
68.0 mm
(2.68 in)
68.0 mm
(2.68 in)
19.1 mm
(0.75 in)
minimum
19.1 mm
(0.75 in)
minimum
Panel Cutout
Panel Thickness
1.52 to 3.18 mm
(0.060 to 0.125 in)
84.5 mm square
(3.33 in)
19.2 mm
(0.76 in) 51.7 mm
(2.04 in)
Customer Front Panel
Part Number Label
Mounting Bracket
6.4 mm
(0.25 in)
Tactile Key,
Screw Terminal Model
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Watlow Series C • 5 • Chapter 2 Installation
2. Insert the controller into the panel cutout.
3. While pressing the bezel firmly against the panel,
slide the mounting bracket over the back of the con-
troller. Be sure the levers on the mounting bracket
line up with the teeth on the case.
4. Press the bracket up to the back of the panel. The
controller should fit tightly in the panel cutout.
Removing the Panel Mount Square 1/8 DIN
Controller
1. Remove power from the system.
2. Remove all the wiring connections from the back of
the controller.
3. Slide a thin, wide tool (putty knife) under all three
mounting tabs, top then bottom, while pushing for-
ward on the back of the case. Be ready to support
the controller as it slides out of the panel cutout.
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Watlow Series C • 6 • Chapter 3 Wiring
Ó
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this con-
troller 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: Insulated terminals re-
quired for quick connect style
terminals.
For quick connect terminals 1,
2, 6, 7, 8, 9, and 10, AMP P/N
3-520406-2 or equivalent recom-
mended. Use Amp crimp tool
P/N 58078-3, insert 90391-3.
For quick connect terminals 3, 4,
and 5, AMP P/N 2-520405-2 or
equivalent recommended. Amp
crimp tool P/N 58078-3, insert
58079-3.
The terminals on the back of the Series C and Series TM controllers are
the same for all of the package styles. They are 6.3 mm (0.25 in) quick connect,
push on style terminals or removable screw terminal block. The terminal style
is an ordering option.
Check the part number to determine your hardware configuration. Refer to
the wiring diagrams appropriate for your controller’s configuration.
All outputs are referenced to a de-energized state.
Wiring Guidelines
1. Use the correct thermocouple type per the model number on the case stick-
er of the unit. See dimension drawings for sticker locations.
• Use correct thermocouple polarity. Red is usually negative.
• If you must extend thermocouple leads, use thermocouple extension
wire to minimize errors.
• Be sure you have good crimp connections on your thermocouple con-
nections.
• Insulate the thermocouple mounting from the mounting surface to
prevent heat migration input errors.
• Thermocouple leads should be routed separately from any high voltage
lines.
• Long lead lengths create electrical resistance and there is not any lead
resistance compensation. When using a two or three-wire RTDs, there will
be an additional 2.6° C (4.7° F) error for every 1Ωof lead length resistance.
That resistance when added to the resistance of the RTD element, can re-
sult in erroneous input to the temperature controller.
2. In electrically-noisy environments (heavy switching contactors, motors,
solenoids, etc.), use shielded thermocouple lead wire with the shield con-
nected at the sensor end only.
3. Use a separate thermocouple to maintain the limit function of this
controller; do not parallel thermocouple input from the primary controller.
4. All wiring and fusing must conform to the National Electric Code (NEC)
NFPA70 and any other locally applicable codes.
5. Fuse the independent load voltage on the L1 (hot) side and connect it to
the common (C) side of the relay.
Note: The model number determines the connection terminal style. See below for terminal locations.
1
2
3
4
5
6
10
9
8
7
1
2
3
4
5
6
10
9
8
7
Wiring
3
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Watlow Series C • 7 • Chapter 3 Wiring
ç
Warning:
Use National Electric (NEC) or
other country-specific standard
wiring and safety practices when
wiring and connecting this con-
troller 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.
Ó
WARNING: If high voltage is ap-
plied to a low-voltage controller,
irreversible damage will occur.
Note: Insulated terminals re-
quired for quick connect style
terminals.
For quick connect terminals 1,
2, 6, 7, 8, 9, and 10, AMP P/N
3-520406-2 or equivalent recom-
mended. Use Amp crimp tool
P/N 58078-3, insert 90391-3.
For quick connect terminals 3, 4,
and 5, AMP P/N 2-520405-2 or
equivalent recommended. Amp
crimp tool P/N 58078-3, insert
58079-3.
Note: To prevent ground loops,
isolation needs to be maintained
from input to output when us-
ing a switched DC output. Un-
grounded thermocouples recom-
mended.
Figure 7a — AC Power Wiring
• Nominal voltage options:
- 24VÅ(ac)
- 120VÅ(ac)
- 230 to 240VÅ(ac)
L1
L2
L1
L2
1
2
3
4
5
6
10
9
8
7
Figure 7b — Thermocouple Input
Thermocouples are polarity sensitive. The negative lead (usually red) must be
connected to TC-.
• Input impedance: >10 MΩ
TC+
TC-
Thermocouple -
Thermocouple +
1
2
3
4
5
6
10
9
8
7
Figure 7c — RTD Input
(100 ΩPlatinum DIN curve 0.00385 Ω/Ω/°C)
• Terminals S2 and S3 must be shorted for a two-wire RTD
• Nominal excitation current: 125 μA
S2
S1
RTD S1
RTD S2
S3
S3
RTD S1
RTD S2
RTD S3
2-Wire RTD3-Wire RTD*
*No lead resistance
compensation
1
2
3
4
5
6
10
9
8
7
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Watlow Series C • 8 • Chapter 3 Wiring
ç
Warning:
Use National Electric (NEC)
or other country-specific
standard wiring and safety
practices when wiring and
connecting this controller to
a power source and to elec-
trical sensors or peripheral
devices. Failure to do so may
result in damage to equip-
ment and property, and/or
injury or loss of life.
Note: Insulated terminals re-
quired for quick connect style
terminals.
For quick connect terminals
1, 2, 6, 7, 8, 9, and 10, AMP
P/N 3-520406-2 or equivalent
recommended. Use Amp
crimp tool P/N 58078-3, in-
sert 90391-3.
For quick connect terminals
3, 4, and 5, AMP P/N 2-
520405-2 or equivalent rec-
ommended. Amp crimp tool
P/N 58078-3, insert 58079-3.
Quencharc Note:
Switching pilot duty loads
(relay coils, solenoids, etc.)
with the mechanical relay
output options requires use
of an R.C. suppressor.
Watlow carries the R.C. sup-
pressor Quencharc brand
name, which is a trademark
of ITW Paktron. Watlow Part
No. 0804-0147-0000.
Figure 8a — Switched DC Output
• Maximum voltage output into an infinite load, 24VÎ(dc)
• Minimum output voltage at 10 mA, 5VÎ(dc)
• Minimum load impedance, 500Ω
• Offstate leakage, 100μAÎ(dc)
• Not recommended for switching mechanical relays
• Output supplies power
SWDC-
SWDC+ Switched DC+
Switched DC-+
-External
Load
Internal Circuitry
SWDC-
SWDC+
17V (dc) unreg
Switched DC
300Ω
300Ω
1
2
3
4
5
6
10
9
8
7
Figure 8b — Mechanical Relay Output
• Form C contacts
• 8 A, resistive
• 250 VA pilot duty, 120/240VÅ(ac), inductive
• 240VÅ(ac) maximum
• 30VÎ(dc) maximum
• See Quencharc note
• For use with ac or dc
• Minimum load current 100 mA
• Output does not supply power
Internal Circuitry
COM.
N.O.
Mechanical Relay
N.C.
C
N.C.
N.O. Normally Open
Common
Normally Closed L1
L2
External
Load
Customer supplied Quencharc
for pilot duty, inductive loads
only. See note.
1
2
3
4
5
6
10
9
8
7
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Watlow Series C • 9 • Chapter 3 Wiring
System Wiring Examples
Fuse
Series LF
Limit Control
LFC4JW0120AAAAA
Heater
Process Sensor Limit Sensor
High Limit
Mechanical
Contactor
SSR-240-10A-DC1
Solid-State Relay
in out
High-
Temp.
Light
coil
+
Series CV
Temperature Controller
CVB1JH00000100C
Fuse
Fuse
Fuse
-
Reset Switch
(customer supplied)
Customer
Supplied
Quencharc
L1
L2
120V~(ac)
Power Disconnect
Switch
SWDC-
SWDC+
L1
L2
TC+
TC-
COM
N.O.
N.C.
TC+
TC-
SW-1
SW-2
L1
L2
Not used 1
10
9
8
7
6
5
4
3
2
1
10
9
8
7
6
5
4
3
2
1
2
1
2
3
4
8
9
10
11
12
5
6
7
13
4 (+)
5 (-)
120V• • (ac)• •
L1 L2
13
67
89
1 CR-1
1
111
14 (+)
15 (-)
SW-1 12
SW-2 13
17
1
2
2
2
SSR-240-10A-DC1
Solid-State Relay
10
(+) (-)
Heater48 to 260
V• • out
3 to 32
V• • (dc) in
High-Temperature Light
1 CR
16 2
2
R
18
L1 9
SWDC+ SWDC-
COM
N.O.
N.C.
Power Disconnect
Switch
TC+
TC-
Series CV
Temperature Controller
CVB1JH00000100C
Series LF
Limit Controller
LFC4JW0120AAAAA
10
4
3
67
L2
7
6
8
L1 9
TC+
TC-
10
4
3
L2
Figure 9 — System Wiring Examples
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Watlow Series C • 10 • Chapter 4 User Interface
User Interface
4
F
C
LOAD
CV
LED Display: Indicates
the set point. Display
momentarily blinks when
new set point value is
entered.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Set Point Knob: To increase
set point, turn knob clockwise.
To decrease set point, turn
knob counterclockwise. Set
point can be changed at any
time. The new set point is
entered 3 seconds after the
knob stops moving.
Variable Set Point, Standard
CV _ _ (1, 2, 5 or 6) _ _ _ _ _ _ _ _ _ A
CV
Finger Tip Indent: Insert
finger tip into indent for
quick and easy set point
changes.
Figure 10a — Vari-
able Set Point Standard
Interface
F
C
LOAD
CV
LED Display: Indicates
the set point. Display
momentarily blinks when
new set point value is
entered.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Increment and Decrement Keys:
Press the Up-Arrow key to
increase the set point.
Press the Down-Arrow key to
decrease the set point.
The new set point is entered 3
seconds after the last key stroke.
Variable Set Point, Standard
CV _ _ (A, B, C or D) _ _ _ _ _ _ _ _ _ A
Figure 10b — Variable
Set Point with Tactile
Keys
To adjust the Calibration Offset on models with tactile
keys, first hold down both the Increment and Decre-
ment keys for five seconds. The display will first show
[`CAL] for five seconds, then it will display the Cali-
bration Offset value. Adjust the value with the Incre-
ment and Decrement keys (range: -30 to 30°). The new
value will take effect three seconds after the last key
stroke. The display will blink, then return to the pri-
mary display after five seconds.
To change the temperature units on models with
tactile keys, first hold down both the Increment and
Decrement keys for ten seconds. The display will show
[F``C] for two seconds. Adjust the units with the In-
crement and Decrement keys. The new value will take
effect three seconds after the last key stroke. The dis-
play will blink, then return to the primary display after
five seconds. The set point value, process value and
offset will automatically adjust to the new temperature
scale.
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Watlow Series C • 11 • Chapter 4 User Interface
PROCESS
F
C
LOAD
CV
CV
LED Display: Indicates set point,
until the PROCESS key is pressed.
Process value (actual temperature)
is displayed until the PROCESS key
is released.
PROCESS Key: Press and hold
this key to display process
(actual temperature) value. Set
point is not adjustable until key
is released.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Set Point Knob: To increase
set point, turn knob clockwise.
To decrease set point, turn
knob counterclockwise. The
new set point is entered 3
seconds after the knob stops
moving. Set point will not
change while the PROCESS
key is pressed.
Variable Set Point, Push for Process
CV _ (1, 2, 5 or 6) _ _ _ _ _ _ _ _ _ _ B
Finger Tip Indent: Insert
finger tip into indent for
quick and easy set point
changes.
Figure 11a —
Variable Set Point,
Push for Process
Interface
F
C
LOAD
CV
PROCESS
LED Display: Indicates set point,
until the PROCESS key is pressed.
Process value (actual temperature)
is displayed until the PROCESS key
is released.
PROCESS Key: Press and hold
this key to display process
(actual temperature) value. Set
point is not adjustable until key
is released.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Variable Set Point, Push for Process
CV _ (A, B, C or D) _ _ _ _ _ _ _ _ _ _ B
Increment and Decrement Keys:
Press the Up-Arrow key to
increase the set point.
Press the Down-Arrow key to
decrease the set point.
The new set point is entered 3
seconds after the last key stroke.
The set point will not change while
the PROCESS key is pressed.
Figure 11b —
Variable Set Point,
Push for Process
Interface with Tac-
tile Keys
To adjust the Calibration Offset on models with tactile
keys, first hold down both the Increment and Decre-
ment keys for five seconds. The display will first show
[`CAL] for five seconds, then it will display the Cali-
bration Offset value. Adjust the value with the Incre-
ment and Decrement keys (range: -30 to 30°). The new
value will take effect three seconds after the last key
stroke. The display will blink, then return to the pri-
mary display after five seconds.
To change the temperature units on models with
tactile keys, first hold down both the Increment and
Decrement keys for ten seconds. The display will show
[F``C] for two seconds. Adjust the units with the In-
crement and Decrement keys. The new value will take
effect three seconds after the last key stroke. The dis-
play will blink, then return to the primary display after
five seconds. The set point value, process value and
offset will automatically adjust to the new temperature
scale.
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Watlow Series C • 12 • Chapter 4 User Interface
F
C
LOAD
PUSH
TO SET
CV
LED Display: Indicates
the set point.
PUSH TO SET Key:
Press and hold key to
adjust the set point
temperature. The new set
point is entered 3 seconds
after the knob stops
moving. Set point will not
change unless PUSH TO
SET key is pressed.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Set Point Knob: To increase
set point, turn knob clockwise.
To decrease set point, turn
knob counterclockwise. The
new set point is entered 3
seconds after the knob stops
moving.
Variable Set Point, Push to Set
CV _ (1, 2, 5 or 6) _ _ _ _ _ _ _ _ _ _ C
Finger Tip Indent: Insert
finger tip into indent for
quick and easy set point
changes.
Figure 12a — Variable
Set Point, Push to Set In-
terface
F
C
LOAD
CV
PUSH TO
SET
LED Display: Indicates
the set point.
PUSH TO SET Key:
Press and hold key to
adjust the set point
temperature. Set point will
not change unless PUSH
TO SET key is pressed.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Variable Set Point, Push to Set
CV _ (A, B, C or D) _ _ _ _ _ _ _ _ _ _ C
Increment and Decrement Keys:
Press the Up-Arrow key to
increase the set point.
Press the Down-Arrow key to
decrease the set point.
The new set point is entered 3
seconds after the last key stroke.
Figure 12b — Variable
Set Point, Push to Set In-
terface with Tactile Keys
To adjust the Calibration Offset on models with tactile
keys, first hold down both the Increment and Decre-
ment keys for five seconds. The display will first show
[`CAL] for five seconds, then it will display the Cali-
bration Offset value. Adjust the value with the Incre-
ment and Decrement keys (range: -30 to 30°). The new
value will take effect three seconds after the last key
stroke. The display will blink, then return to the pri-
mary display after five seconds.
To change the temperature units on models with
tactile keys, first hold down both the Increment and
Decrement keys for ten seconds. The display will show
[F``C] for two seconds. Adjust the units with the In-
crement and Decrement keys. The new value will take
effect three seconds after the last key stroke. The dis-
play will blink, then return to the primary display after
five seconds. The set point value, process value and
offset will automatically adjust to the new temperature
scale.
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Watlow Series C • 13 • Chapter 4 User Interface
To adjust the Calibration Offset on models with tactile
keys, first hold down both the Increment and Decre-
ment keys for five seconds. The display will first show
[`CAL] for five seconds, then it will display the Cali-
bration Offset value. Adjust the value with the Incre-
ment and Decrement keys (range: -30 to 30°). The new
value will take effect three seconds after the last key
stroke. The display will blink, then return to the pri-
mary display after five seconds.
To change the temperature units on models with
tactile keys, first hold down both the Increment and
Decrement keys for ten seconds. The display will show
[F``C] for two seconds. Adjust the units with the In-
crement and Decrement keys. The new value will take
effect three seconds after the last key stroke. The dis-
play will blink, then return to the primary display after
five seconds. The set point value, process value and
offset will automatically adjust to the new temperature
scale.
F
C
LOAD
CV
PUSH
TO SET
LED Display: Indicates
the process value until
the Push to Set Key is
operated.
PUSH TO SET Key:
The process value (Actual
Temperature) is displayed
when this key is not
operated. When this key is
depressed, the set point is
displayed and can be
adjusted.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Set Point Knob: To increase
set point, turn knob clockwise.
To decrease set point, turn
knob counterclockwise. The
new set point is entered 3
seconds after the knob stops
moving.
Variable Set Point, Push to Set
CV _ (1, 2, 5 or 6) _ _ _ _ _ _ _ _ _ _ D
Finger Tip Indent: Insert
finger tip into indent for
quick and easy set point
changes.
Figure 13a — Variable
Set Point, Push to Set In-
terface
F
C
LOAD
CV
PUSH TO
SET
LED Display: Indicates
the process value until
the Push to Set Key is
operated.
PUSH TO SET Key:
The process value (Actual
Temperature) is displayed
when this key is not
operated. When this key is
depressed, the set point is
displayed and can be
adjusted.
LOAD Indicator Light: Lit
when output is energized.
F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
Variable Set Point, Push to Set
CV _ (A, B, C or D) _ _ _ _ _ _ _ _ _ _ D
Increment and Decrement Keys:
Press the Up-Arrow key to
increase the set point.
Press the Down-Arrow key to
decrease the set point.
The new set point is entered 3
seconds after the last key stroke.
Figure 13b — Variable
Set Point, Push to Set In-
terface with Tactile Keys
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Watlow Series C • 14 • Chapter 4 User Interface
F
C
TM
TM F or C Indicator Light: Lit
to indicate if unit is configured
for degrees Fahrenheit or
degrees Celsius.
LED Display: Indicates
the process value.
TM _ _ _ _ _ _ _ _ _ _ _ _ _
Temperature Indicator
Figure 14 — Temperature Indicator Interface
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Watlow Series C • 15 • Troubleshooting
Troubleshooting
Indication Probable Cause(s) Corrective Action
On indicating controls, the
display is not illuminated.
• Power supply switch off. • Turn switch on.
• Fuse blown. • Replace fuse (check cause of failure).
• Breaker tripped. • Reset breaker (check cause of failure).
• Safety interlock door switch activated. • Close door.
• Separate system limit control latched. • Reset limit controller.
• Wiring incorrect or open. • Check wiring.
• Power supply voltage incorrect. • Verify input power.
• Defective controller. • Repair or replace controller.
Troubleshooting thermocouple inputs
Temperature reading is
incorrect, showing a sen-
sor error, [Er;In] , or LOAD
LED is switching at the
wrong temperature.
• Calibration offset is incorrect (tactile
models only).
Check calibration offset.
• Settings for degree C or F is incorrect. Check model part number for degree C or F.
If model has Increment/Decrement keys then
C/F setting is adjustable.
• Sensor or controller may be bad.
Sensor connections may be bad.
• Place a jumper wire across the thermo-
couple input terminals. The display should
indicate ambient temperature. If it does, the
controller is OK.
For controllers without the ability to view
process temperature:
- Decrease set point below ambient tempera-
ture, LOAD LED should be off for heating
controllers and on for cooling controllers.
- Increase set point above ambient tempera-
ture. LOAD LED should be on for heating
controllers and off for cooling controllers.
• Ambient temperature in the control
cabinet is over 70°C.
• Measure temperature in cabinet to ensure
it is below 70C. Vent cabinet or add fans if
necessary.
• Ground loop problem. Can occur
when using a switched DC output and
a grounded thermocouple.
• Remove power from the system. Use an
ohm meter to measure resistance between
output DC- and the thermocouple sheath. If
there is continuity, replace sensor with an
ungrounded thermocouple.
Temperature reading is de-
creasing, but actual process
is increasing.
• Thermocouple polarity is reversed. In
the US, red wire insulation denotes the
negative wire.
• Check thermocouple connections. All con-
nections, including extension wire must
maintain the correct polarity. Correct polarity
problems.
Temperature reading is
reading low and not increas-
ing while actual process
temperature is increasing.
• Sensor is bad. Thermocouple is short-
ed.
• Check thermocouple connections. Check
thermocouple wire insulation to make sure
it is not damaged, causing the wires to short
(making a new junction).
Temperature reading is
offset from actual process
temperature, or the output
switches on or off at the
wrong temperature. The off-
set changes with changes in
process temperature.
• Copper wire was used instead of ther-
mocouple extension wire. Connectors
of metals different than thermocouple
metal were used to splice or make con-
nections.
• Check thermocouple connections. Check to
make sure that only thermocouple extension
wire of the correct type was used to extend
thermocouple leads. Replace if necessary.
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Watlow Series C • 16 • Troubleshooting
Indication Probable Cause(s) Corrective Action
Troubleshooting RTD inputs
Temperature reading is in-
correct, showing a sensor er-
ror, [Er;In] , or LOAD LED
is switching at the wrong
temperature.
• Calibration offset incorrect (tactile
models only).
Check calibration offset
• Settings for degree C or F is incorrect. Check model part number for degree C or F.
If model has Increment/Decrement keys then
C/F setting is adjustable.
• Sensor or controller may be bad. Sen-
sor connections may be bad.
• Place a 110 ohm resistor across the sensor
input terminals. The display should indicate
25°C (77°F). If it does, the controller is OK.
Sensor or connections may be bad.
For controllers without the ability to view
process temperature:
- Decrease set point below ambient tempera-
ture, LOAD LED should be off for heating
controllers and on for cooling controllers.
- Increase set point above ambient tempera-
ture. LOAD LED should be on for heating
controllers and off for cooling controllers.
• Ambient temperature in the control
cabinet is over 70°C (158°F).
• Measure temperature in cabinet to ensure
it is below 70°C (158°F). Vent cabinet or add
fans if necessary.
• Sensor connections may be bad. Ex-
cessive lead wire resistance.
• Check sensor connections. Measure lead
wire resistance. There will be a 2.6°C (4.7°F)
error for every ohm of lead wire resistance.
Troubleshooting controller outputs
Controller output signal is
not on when it should be.
Load LED is not on.
• Temperature reading is incorrect on
display of indicating controls or limit.
See input troubleshooting.
• See input troubleshooting.
• Set point is not set correctly. • Verify set point setting.
Controller output signal is
not on when it should be.
Load LED is on.
• Output wiring is incorrect. • Verify wiring. Relay outputs act as a
switch, they do not source power.
For DC output controls, voltage should be
about 20VDC with no load. Greater than 5
volts with load of 500 Ωor greater.
Control output signal is on
when it should not be on.
Load LED is on.
• Temperature reading is incorrect on
display of indicating controls or limit.
see input troubleshooting.
• See input troubleshooting.
• Set point is not set correctly. • Verify set point setting.
• Control output is defective. • Repair or replace controller.
Load is on when it should
not be on. Load LED is off.
• Power switching device (SSR, HG
relay, mechanical relay) is shorted. Con-
troller outputs shorted.
• Remove wires from output of control to in-
put of power switching device. If load is still
on, replace power switching device. If load
turns off, replace controller or sensor. See in-
put troubleshooting.
• Output wiring is incorrect. • Verify wiring.
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Watlow Series C • 17 • Specifications
Specifications
Controller
• Microprocessor based, on-off control mode.
• Nominal switching hysteresis, typically 1.7°C (3°F).
• Input filter time: 1 second
Operator Interface (model dependent)
• Four digit , 7 segment LED displays, .28" high.
• °F or °C indicator LED.
• LOAD indicator LED.
• Continuous turn, velocity sensitive rotary encoder for set
point adjustment, on rotary-knob models.
• Front panel key on Push for Set Point or Push for Pro-
cess options.
• No operator interface on fixed set point models.
• Increment/Decrement keys for set point adjustment on
tactile key models.
Standard Conditions For Specifications
• Rated line voltage, 50 to 60Hz, 0 to 90% RH non-con-
densing, 15-minute warm-up.
Calibration ambient range: 25°C (77°F) ±3°C
Sensor Input
Thermocouple
• Grounded or ungrounded.
• Type E, J, K, T thermocouple types.
• >10 MΩ input impedance
• 250 nV input referenced error per 1Ω source resis-
tance.
RTD
• 2-wire or 3-wire platinum, 100 Ω
• DIN curve (.00385 curve)
• 125 μA nominal RTD excitation current
Input Accuracy Span Range
Type E: -200 to 800°C or -328 to 1,470°F
Type J: 0 to 750°C or 32 to 1,382°F
Type K: -200 to 1,250°C or -328 to 2,282°F
Type T: -200 to 350°C or -328 to 662°F
RTD (DIN):-200 to 800°C or -328 to 1,472°F
Thermocouple Input
• Calibration accuracy: ±1% of input accuracy span, ±1° at
standard conditions and actual calibration ambient.
Exception: Type T, ±2.4% of input accuracy span for -200
to 0° (-328 to 32°F)
• Temperature stability: ±0.3 degree per degree change in
ambient.
RTD Input
• Calibration accuracy ±1% of input accuracy span ±1° at
standard conditions and actual calibration ambient.
• Temperature stability: ±0.2 degree per degree change in
ambient
Allowable Operating Ranges
Type E: -200 to 800°C or -328 to 1,470°F
Type J: -210 to 1,038°C or -346 to 1,900°F
Type K: -270 to 1,370°C or -454 to 2,500°F
Type T: -270 to 400°C or -454 to 750°F
RTD (DIN):-200 to 800°C or -328 to 1,472°F
Output Types
Switched DC (non-isolated)
• Supply voltage maximum: 24V Î (dc) into an infinite load.
• Supply voltage minimum: 5V Î (dc) at 10 mA
• Minimum load impedance: 500 Ω
Electromechanical Relay, Form C
• Minimum load current: 100 mA
• 8 A @ 240V Å (ac) or 30V Î (dc) maximum, resistive
• 250 VA pilot duty, 120/240V Å (ac) maximum, inductive
• Use RC suppression for inductive loads
• Electrical life 100,000 cycles at rated current
Agency Approvals
• UL®873 Recognized Temperature Controller and Indica-
tor. File E43684.
• NEMA 4X/IP65 on panel mount package options with
tactile keys for set point.
• UL®197 Reviewed for use in cooking appliances.
• W.E.E.E; CE - See Declaration of Conformity.
• ANSI Z21.23 Gas Appliance Thermostat approval.
• Temperature Control and Indicator CSA 22.2 No. 24.
• RoHS Directive (2002-95-EC)
Terminals
• 6.4 mm (0.25 in) quick connect, push-on termi-
nals. See order options. Refer to Wiring section for
crimp-on terminal recommendations.
• Removable screw clamp style terminal blocks. See
order options.
• Wire gauge 0.1 to 4 mm2(30 to 12 AWG). Strip
length, 8 mm (0.30 in).
• Torque : 0.8 Nm (7 in-lb) maximum.
Power
• 24V Å (ac) +10%; -15%; 50/60 Hz, ±5%
• 120V Å (ac) +10%; -15%; 50/60 Hz, ±5%
• 230 to 240V Å (ac) +10%; -15%; 50/60 Hz, ±5%
• 10VA maximum power consumption
• Data retention upon power failure via nonvolatile memory
Operating Environment
• 0 to 70°C (32 to 158°F)
• 0 to 90% RH, non-condensing
• Storage temperature: -40 to 85°C (-40 to 185°F)
Dimensions
• DIN Rail model can be DIN rail or chassis mount
DIN rail spec DIN 50022, 35 mm x 7.5 mm (1.38 in x 0.30 in)
Style Width Height Depth
Open board 61.7 mm
(2.43 in)
61.7 mm
(2.43 in)
45.1 mm
(1.78 in)
Potted 70.1 mm
(2.76 in)
102.9 mm
(4.05 in)
46.6 mm
(1.84 in)
DIN Rail 78.1 mm
(3.08 in)
112.3 mm
(4.42 in)
90.7 mm*
(3.57 in)
Square 1/8
DIN Panel
72.4 mm
(2.85 in)
72.4 mm
(2.85 in)
Behind panel
51.7 mm
(2.04 in)
*Depth including DIN rail, 94.7 mm (3.73 in)
Note: These specifications are subject to change without
prior notice.
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Watlow Series C • 18 • Ordering Information
Ordering Information and Model Numbers
On-off controller, No user interface CF ____ ____ AAAA _
Set Point Type
F Fixed Set Point
Line Voltage and Output
B120VÅ (ac), Switched DC Output
C120VÅ (ac), 8 Amp Relay Output
D230 to 240VÅ (ac), Switched DC Output
E230 to 240VÅ (ac), 8 Amp Relay Output
F24VÅ (ac), Switched DC Output
G24VÅ (ac), 8 Amp Relay Output
Controller Package
1 Panel Mount, 1/8 DIN Square -Spade Terminals
2 DIN Rail Mount -Spade Terminals
3 Open Board, not potted -Spade Terminals
4 Potted Case -Spade Terminals
5 Panel Mount, 1/8 DIN Square -Screw Terminals
6 DIN Rail Mount -Screw Terminals
7 Open Board, not potted -Screw Terminals
Sensor and Sensor Operating Range
H Type J -346 to 1900 Degrees F
J Type J -210 to 1038 Degrees C
K Type K -454 to 2500 Degrees F
L Type K -270 to 1370 Degrees C
M Type T -454 to 750 Degrees F
N Type T -270 to 400 Degrees C
P 100 Ω RTD -328 to 1472 Degrees F
R 100 Ω RTD -200 to 800 Degrees C
S Type E -328 to 1470 Degrees F
T Type E -200 to 800 Degrees C
Control Mode
H Heat
C Cool
Fixed Set Point Value *
XXXX Control Set Point Value**
Overlay/Custom Options
A Standard
*Note: Set point must fall within the sensor operating range.
**Note: A (-) is used in the left digit of the operating range to indicate negative temperature values.
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