Watlow EZ-ZONE ST User Manual
TOTAL
3 Year Warranty
CUSTOMER
SATISFACTION
EZ-ZONE® ST
User’s Manual
Integrated Control Loop
1241 Bundy Boulevard., Winona, Minnesota USA 55987
Phone: +1 (507) 454-5300, Fax: +1 (507) 452-4507 http://www.watlow.com
ISO 9001
Registered Company
Winona, Minnesota USA
0600-0052-0000 Rev. F Made in the U.S.A.
January 2010
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.
çCAUTION or WARNING
ÓElectrical Shock Hazard
CAUTION or WARNING
Warranty
The EZ-ZONE™ ST is manufactured by ISO 9001-registered processes and is backed by a three-year warranty
to the first purchaser for use, providing that the units
have not been misapplied. Since Watlow has no control
over their use, and sometimes misuse, we cannot guarantee against failure. Watlow’s obligations hereunder,
at Watlow’s option, are limited to replacement, repair or
refund of purchase price, and parts which upon examination prove to be defective within the warranty period
specified. This warranty does not apply to damage resulting from transportation, alteration, misuse or abuse. The
purchaser must use Watlow parts to maintain all listed
ratings.
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 wintechsupport@watlow.
com 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 EZ-ZONE® ST is manufactured by ISO 9001-registered processes and is backed by a three-year warranty to the first purchaser for use, providing that the
units have not been misapplied. Since Watlow has no
control over their use, and sometimes misuse, we cannot guarantee against failure. Watlow's obligations
hereunder, at Watlow's option, are limited to replacement, repair or refund of purchase price, and parts
which upon examination prove to be defective within
the warranty period specified. This warranty does not
apply to damage resulting from transportation, alteration, misuse or abuse.
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
• 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 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.
3. After we receive your return, we will examine it and
try to verify the reason for returning it.
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 not repairable, 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.
7. Watlow reserves the right to charge for no trouble
found (NTF) returns.
The EZ-ZONE® ST User’s Manual is copyrighted by
Watlow Electric, Inc., © January 2010 with all rights
reserved.
EZ-ZONE® ST is covered by U.S. Patent No. 6,005,577
and Patents Pending
TC
Table of Contents
Chapter 1: Overview . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3
The EZ-ZONE® ST Provides Total Thermal System Control . . . . . . . . . . . . . 3
A Conceptual View of the ST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Getting Started Quickly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Chapter 2: Install, Wire and Set Address . . . . . . . . . . . . . . . . . . . . . . .7
Wiring . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
Installation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Replacing the Solid-State Relay . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
ST Isolation Block . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
Setting the Address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 26
Conventions Used in the Menu Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 27
Chapter 3: Operations Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 30
Analog Input Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 31
Digital Input/Output Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Limit Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Monitor Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 32
Loop Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 33
Alarm Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 35
Current Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
Profile Status Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 37
Chapter 4: Setup Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
Analog Input Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 40
Digital Input/Output Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 42
Limit Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Control Loop Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 44
Output Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 47
Alarm Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 48
Current Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50
Function Key . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 51
Global Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 52
Communications Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 53
Chapter 5: Profiling Page . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .54
Chapter 6: Factory Pages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .59
Custom Setup Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Security Setting Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 60
Security Setting Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Diagnostics Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 62
Calibration Menu . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 63
Chapter 7: Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .64
Saving and Restoring User Settings . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Tuning the PID Parameters . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65
Inputs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66
Control Methods . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 68
Alarms . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 72
Using Lockout to Hide Pages and Menus . . . . . . . . . . . . . . . . . . . . . . . . . . 73
Watl o w E Z- Z O NE® S T • 1 • Ta b l e of Co n t en t s
TC
Table of Contents (cont.)
Modbus - Using Programmable Memory Blocks . . . . . . . . . . . . . . . . . . . . . 75
CIP - Communications Capabilities . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 75
Software Configuration . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 76
Chapter 8: Appendix . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Troubleshooting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 79
Modbus - Programmable Memory Blocks . . . . . . . . . . . . . . . . . . . . . . . . . . 82
CIP Implicit O to T (Originator to Target) Assembly Structure. . . . . . . . . . . 84
CIP Implicit T to O (Target to Originator) Assembly Structure. . . . . . . . . . . 84
Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 85
Ordering Information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 86
Index . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 89
Declaration of Conformity . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 93
How to Reach Us . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 95
Watl o w E Z- Z O NE® S T • 2 • Ta b l e of Co n t en t s
1
Chapter 1: Overview
The EZ-ZONE® ST Provides Total Thermal System Control
The EZ-ZONE ST solid-state controller offers complete thermal system control in a single package
while reducing system complexity and the cost of
control-loop ownership. You can order a PID controller already connected to a high-amperage, solid-state
relay capable of zero cross or phase angle firing with
the option of adding a properly sized heat sink, an
over-under temperature limit, a shut-down power
contactor, and digital communications in one package.
It just got a whole lot easier to solve the thermal
requirements of your system. Because the EZ-ZONE
ST along with the entire family of EZ-ZONE controls
are highly scalable where you pay only for what you
need. So if you are looking for a PID controller with
high amperage outputs, an over-under limit controller
or an integrated controller, the EZ-ZONE ST is the
answer.
Features and Benefits
Back panel or DIN rail mount
• Provides several mounting options
Compact package
• Reduces panel size
Touch-safe package
• IP2X-Touch safe with back of hand
• Increases safety for installers and operators
±0.1 percent temperature accuracy
• Provides efficient and accurate temperature control
Agency approvals: (with factory-installed
heatsink); (without factory-installed heatsink); CE; RoHS; W.E.E.E.; CSA
• Limit version features FM approval
• Provides third-party recognition
Three-year warranty
• Provides Watlow reliability and product support
Off-the-shelf designed system solution
• Improves system reliability and reduces wiring
• Reduces installation cost
• Eliminates compatibility headaches often encoun-
tered when using many different components and
brands
Profile capability
• Includes ramp and soak with four files and forty
steps
Communications with PLC, PC or HMI
• ST with optional Modbus® RTU protocol
Watl o w E Z- Z O NE® S T • 3 • Cha p ter 1 Ov e rv i ew
• When used with the optional Remote User Inter
face/Gateway (RUI/GTW) the following protocols
are available:
- EIA 232/485 Modbus RTU
- Modbus TCP
- EtherNet/IP
- DeviceNet
- Profibus DP
Solid-State Relay output
• Provides faster cycling, more precise control, in-
creased heater life and energy efficiency
• Resistive or inductive load current of up to 75 am-
peres using either zero-cross or phase angle control
modes
• Soft start feature with phase angle control mode to
prevent load failure or blowing fuses
PID temperature control
• Provides accurate temperature control
• Provides a single input and dual outputs
• Provides standard or adaptive (TRU-TUNE+)
PID tuning algorithms.
Optional temperature limit
• Increases safety during under and over-tempera-
ture conditions
Optional definite purpose mechanical contactor
• Enables circuit safety shutdown driven by a limit
controller or a PID alarm output signal
Optional current monitoring feature
• Detects heater current flow and alarm indication of
failed Solid-State Relay or a heater zone
Optional Solid-State Relay heat sink
• Sized and engineered for specific applications
• Factory assembled heat sink required for UL listing
System diagnostics
• Provides continuous system level monitoring with
alerts reducing the overall cost for maintenance ad
service
Advanced controllability algorithms
• TRU-TUNE+™ meets demanding controllability
requirements.
PC Software: EZ-ZONE ST Configurator
• Wizard-style configuration of controller settings
• Online or offline recipe editing
UL® is a registered trademark of Underwriter’s Laboratories Inc.
Modbus™ is a trademark of Schneider Automation Incorporated.
A Conceptual View of the ST
The flexibility of the ST software and hardware allows
a large range of configurations. Acquiring a better
understanding of the controller's overall functionality
and capabilities while at the same time planning out
how the controller can be used will deliver maximum
effectiveness in your application.
It is useful to think of the controller in terms of
functions; there are internal and external functions.
An input and an output would be considered external functions where the PID calculation would be an
internal function. Information flows from an input
function to an internal function to an output function
when the controller is properly configured. A single
ST control can carry out several functions at the same
time. For instance, closed-loop control monitoring for
several different alarm situations, while at the same
time operating switched devices, such as lights and
motors. Each process needs to be thought out carefully
and the controller’s various functions set up properly.
Inputs Functions
The inputs provide the information that any given
programmed procedure can act upon. In a simple form,
this information may come from an operator pushing
a button or as part of a more complex procedure it
may represent a remote set point being received from
another controller.
Each analog input typically uses a thermocouple
or RTD to read the temperature of something. It can
also read volts, current or resistance, allowing it to
use various devices to read humidity, air pressure,
operator inputs and others values. The settings in the
Analog Input Menu (Setup Page) for each analog input
must be configured to match the device connected to
that input.
Each digital input reads whether a device is active or inactive. A controller with digital input-output
(DIO) hardware includes two sets of terminals each.
Each DIO must be configured to function as either an
input or output with the Direction parameter in the
Digital Input/Output Menu (Setup Page).
The EZ-ZONE Remote User Interface (RUI) has a
function, or EZ Key on the front panel, this too can be
configured as a digital input by toggling the function
assigned to it in the Digital Input Function parameter
in the Function Key Menu (Setup Page). If interested
in learning more about the RUI and how it is used
with the ST retrieve the RUI user manual from the
Watlow web site. Point your browser to:
http://www.watlow.com/literature/pti_search.cfm?dltype=5
Once there, type in EZ-ZONE for a keyword at the
bottom of the page and then click on the search button
to find the user manual.
set a state to true or false, or reading a temperature to
set an alarm state to on or off. Or, it could compare the
temperature of a process to the set point and calculate
the optimal power for a heater.
To set up a function, it’s important to tell it what
source, or instance, to use. For example, an alarm may
be set to respond to either analog input 1 or 2 (instance 1 or 2, respectively).
Outputs Functions
Outputs can perform various functions or actions in
response to information provided by a function, such
as operating a heater, driving a compressor, turning a
light on or off, unlocking a door, turning on a buzzer
etc...
Assign an output to a Function in the Output
Menu or DIO Menu. Then select which instance of
that function will drive the selected output. For example, you might assign an output to respond to alarm 2
(instance 2).
You can assign more than one output to respond to
a single instance of a function. For example, alarm 2
could be used to trigger a light connected to output 1
and a siren connected to digital output 5.
Input Events and Output Events
Input and output events are internal states that are
used exclusively by profiles. The source of an event
input can come from a real-world digital input or an
output from another function. Likewise, event outputs
may control a physical output such as an output function block or be used as an input to another function.
Internal Functions
Functions use input signals to calculate a value. A
function may be as simple as reading a digital input to
Watl o w E Z- Z O NE® S T • 4 • Cha p ter 1 Ov e rv i ew
Getting Started Quickly
The ST control has a page and menu structure that is
listed below along with a brief description of its purpose.
Setup Page
Push and hold the up
and down keys (¿ ¯)
for 6 seconds to enter.
(See the Setup Page for
further information)
Operations Page
Push and hold the up
and down keys (¿ ¯)
for 3 seconds to enter.
(See the Operations
Page for further infor-
mation)
Factory Page
Push and hold the Infinity and the green
Advance keys (ˆ ‰) for
6 seconds to enter. (See
the Factory Page for further information)
Profile Page
Push and hold the the
green Advance key ‰ for
6 seconds to enter. (See
the Profile Page for further information)
The default ST loop configuration out of the box is
shown below:
• Analog Input functions set to thermocouple, type J
• Heat algorithm set for PID, Cool set to off
• Output 1 set to Heat
• Control mode set to Auto
• Set point set to 75 °F
If you are using the input type shown above, simply
connect your input and output devices to the control.
Power up the control and push the up arrow ¿ on
the face of the control to change the set point from
the default value of 75 °F to the desired value. As the
Set Point increases above the Process Value, output 1
will come on and it will now begin driving your output
device.
Once received, a user
would want to setup
their control prior to operation. As an example,
define the input type
and set the output cycle
time.
After setting up the control to reflect your equipment, the Operations
Page would be used
to monitor or change
runtime settings. As an
example, the user may
want to see how much
time is left in a profile
step or perhaps change
the autotune set point.
For the most part the
Factory Page has no
bearing on the control
when running. Here, a
user may want to enable
password protection,
view the control part
number or perhaps create a custom Home Page.
If equipped with this
feature, a user would
want to go here to configure a profile.
Note:
The output cycle time will have a bearing on the
life of mechanical relay outputs and can be different based on the type of output ordered. The output
cycle time can be changed in the Setup Page under
the Output Menu.
EZ-ZONE ST Default Configuration
Input
Function
Input Sensor
Analog Input 1
Thermocouple Type J
PID
Controller
Heat
Loop 1
Output 1
Output
Function
Heat
Watl o w E Z- Z O NE® S T • 5 • Cha p ter 1 Ov e rv i ew
Input
Output
Functions
Input Sensor
- None
- Limit reset
- Profile start/stop
- Profile start
- Profile hold/resume
- Profile disable
- TRU-TUNE+
- Switch Control Loop Off
- Manual mode
- Tune
- Idle set point
- Force alarm
- Loop & alarms off
- Silence alarm
- Alarm clear, request
- Restore user settings
®
disable
EZ-ZONE® ST System Diagram
Analog Input 1
none, Thermocouple, RTD (100Ω,
1kΩ), Process (V, mV, mA)
Digital Input 5 & 6
(optional) DC voltage, Dry Contact
PID
Controller
(Optional -
Ramp/Soak max 4
files, 40 steps)
Standard Bus
Zone Address
1 - 16
Supervisory &
Power Board
Output 1
Solid State Relay (form A)
Output 2
5A Mechanical Relay (form A), or
0.5A Solid State Relay (form A)
Current Sensor
(optional)
Digital Output 5 & 6
(optional) none, switched dc
Functions
off, heat, cool
off, heat, cool
alarm, event
off, heat, cool,
alarm, event, limit
*RUI, EZ-ZONE
Controllers, PLC, PC
or HMI
Input Sensor
EIA-485 Communication
Standard Bus
(optional Modbus RTU)
Analog Input 2
none, Thermocouple, RTD (100Ω,
1kΩ), Process (V, mV, mA)
Note:
Number of inputs and outputs and various combinations of the same will vary
depending upon part number; see ordering matrix for more detail.
* EZ-ZONE Remote User Interface (RUI)
Modbus
Address 1 - 247
Limit Controller
Board
(optional)
Output 3
5A Mechanical Relay (form C)
Output 4
5A Mechanical Relay (form A)
If Limit, this output must
be Limit
Contactor
(optional)
High
Current
Power
off, heat, cool,
event, limit, alarm
Limit
Ó
WARNING: When the controller is powered up, the outputs
may turn on.
Note:
A current error can be sent to the RUI (Remote User
Interface) soft error display by enabling Current
Reading [`CU;r] in the Setup Page.
Watl o w E Z- Z O NE® S T • 6 • Cha p ter 1 Ov e rv i ew
Chapter 2: Install, Wire and Set
36.2 mm
(1.43 in)
156 mm
(6.14 in)
25 A heatsink (shown)
This dimension the same for 40 A heatsink.
63.5 mm
(2.5 in)
25 A (shown)
98.6 mm
(3.88 in)
40 A
177.8 mm
(7.00 in)
41.9 mm
(1.65 in)
35 mm
(1.38 in)
188.6 mm
(7.43 in)
1
2
EZ-ZONE™ ST
Patent Pending
Integrated Control Loop
1
2
EZ-ZONE™ ST
Patent Pending
Integrated Control Loop
51.6 mm
(2.03 in)
87 mm
(3.43 in)
17.4 mm
(0.68 in)
126.1 mm
(4.97 in)
29.5 mm
(1.16 in)
#8 mounting
screw
#8 mounting
screw
2
Address
EZ-ZONE® ST with 25A or 40A Contactor
156 mm
(6.14 in)
25 A heatsink (shown)
WARNING: The heat sink
can become hot during operation.
Front View
177.8 mm
(7.00 in)
1
Control Loop
2 5
EZ-ZONE™ ST
Integrated
Patent Pending
4
36.2 mm
(1.43 in)
188.6 mm
(7.43 in)
This dimension same for 40 A heatsink.
CAUTION: The EZ-ZONE ST
must be mounted vertically
(as shown) to meet the ampere/ambient-temperature
performance curve.
3 6
63.5 mm
(2.5 in)
25 A (shown)
98.6 mm
(3.88 in)
40 A
126.1 mm
(4.97 in)
Side View
EZ-ZONE ST Without a 25A or 40A Contactor
41.9 mm
(1.65 in)
29.5 mm
(1.16 in)
35 mm
(1.38 in)
1
2 5
EZ-ZONE™ ST
Integrated
Control Loop
4
Patent Pending
3
6
WARNING: The heat sink
can become hot during
#8 mounting
screw
operation.
CAUTION: The EZ-ZONE
ST must be mounted vertically (as shown) to meet
the ampere/ambienttemperature performance
curve.
1
EZ-ZONE™ ST
Integrated Control Loop
2
Patent Pending
Side View
Front View
W a tl o w E Z-Z O NE® S T • 7 • Cha p ter 2 In s tal l a n d Wir e
EZ-ZONE ST Without a Contactor
51.6 mm
Front View Side View
WARNING: The
heat sink can become hot during
operation.
(2.03 in)
46 mm
(1.18 in)
215.1 mm
(8.47 in)
39.9 mm
(1.57 in)
CAUTION: The
EZ-ZONE ST must
be mounted vertically (as shown) to
meet the ampere/
ambient-temperature performance
curve.
138.5 mm
(5.45 in)
87 mm
(3.43 in)
28.1 mm
(1.11 in)
48 mm
(1.89 in)
80 mm
(3.15 in)
197.1 mm
(7.76 in)
with 120 and
240Vac fan (shown)
184.4 mm
(7.26 in)
with 24 Vdc fan
126.5 mm
(4.98 in)
89.2 mm
(3.51 in)
35 mm
(1.38 in)
Watl o w E Z- Z O NE® S T • 8 • Cha p ter 2 In s tal l a n d Wir e
–
+
–
+
–
+
S1 S2
S3
S1
S3
–
+
Thermocouple
(Input 2)
Process
0 to 20 mA
(Input 2)
N.O. (Output 3)
N.C. (Output 3)
common (Output 3)
N.O. (Output 4)
contactor (Coil 1)
Contactor
Coil 1
Contactor
Coil 2
S
T_ B - _ _ _ _ - _ _ _ _ (no limit)
ST_ L - _ _ _ _ - _ _ _ _ (with limit)
common (RUI)
T-/R- (RUI)
T+/R+ (RUI)
- common (Digital I/O)
+ Digital Input 6 or Output 6
+ Digital Input 5 or Output 5
ST_ _ - _ _ A _ - _ _ _ _
Remote User Interface (RUI)
common (Modbus RTU)
T-/R- (Modbus RTU)
T+/R+ (Modbus RTU)
- common (Digital I/O)
+ Digital Input 6 or Output 6
+ Digital Input 5 or Output 5
ST_ _ - _ _ M _ - _ _ _ _
Modbus RTU on EIA-485
Limit
Address
Selection
fuse
load
S1 S2
S3
+
–
S1
S3
2-wire
RTD
(Input 1)
3-wire
RTD
(Input 1)
Thermocouple
(Input 1)
Process
0 to 20 mA
(Input 1)
Process
0 to 10VÎ (dc)
0 to 50mVÎ (dc)
(Input 1)
N.O.
(Output 2)
common
(Output 2)
Controller
–
+
2-wire
RTD
(Input 2)
3-wire
RTD
(Input 2)
98
99
CF
CD
CE
B5
D6
D5
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
98
99
CC
CA
CB
B5
D6
D5
1 2 3 4
ON
L3
K3
J3
A1
L4
T2
S2
R2
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
L2
K2
T1
S1
R1
L3
K3
J3
A1
L4
T2
S2
R2
L3
K3
J3
A1
L4
T2
S2
R2
L3
K3
J3
A1
L4
T2
S2
R2
L3
K3
J3
A1
L4
T2
S2
R2
neutral
hot
fuse
fuse
earth
ground
1
6
3
4
A1
A2
2 5
EZ-ZONE™ ST
Patent Pending
Integrated
Control Loop
1 2 3 4
ON
LIMIT
OUT 3
SSR
STATUS
OUT 2
LIMIT
OUT 3
SSR
STATUS
OUT 2
hot
hot
Process
0 to 10VÎ (dc)
0 to 50mVÎ (dc)
(Input 2)
Power Supply
Power Supply
fuse
fuse
Output 1 (SSR)
Ó
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 electrical sensors or peripheral devices. Failure to do so
may result in damage to equipment and property, and/or injury
or loss of life.
Wiring
with a contactor (ST _ _ - (B or F) _ _ _ - _ _ _ _)
Note:
A2 is connected internally to terminal 98.
A1 is connected internally to the contac tor coil. The other side of the coil is con nected to terminal 99.
ç
WARNING: If high voltage is applied to a
low-voltage controller, irreversible damage
will occur.
Note:
Terminals L4 and A1 on the limit connector
are jumpered at the factory to complete the
contactor circuit. Additional switches may
be wired in series to the terminals.
Note:
Use the contactor with a minimum load of
100 watts.
STATUS Indicator Light
Flashing green indicates the controller is running with no input errors.
Flashing red indicates an input error.
No flashing indicates that the controller is not
functioning.
CAUTION: Always mount the controller as
shown, with the heat-sink fins aligned vertically.
Note:
The control common terminal and the digital
common terminal are referenced to different
voltages and must remain isolated.
W a tl o w E Z-Z O NE® S T • 9 • Cha p ter 2 In s tal l a n d Wir e
T-/R- (RUI)
T+/R+ (RUI)
common (RUI)
- common (Digital I/O)
+ Digital Input 6 or Output 6
+ Digital Input 5 or Output 5
ST_ _ - _ _ A _ - _ _ _ _
Remote User Interface
(RUI)
Power
h
h
Indicator
Lights
Power Power
Wiring
without a contactor (ST _ _ - A _ _ _ _ - _ _ _ _ )
ot
ot
Ó
WARNING: Use National Electric (NEC) or other countryspecific standard wiring and safety practices when wiring
and connecting this controller 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.
ç
WARNING: If high voltage is applied to a low-voltage controller, irreversible damage will occur.
CAUTION: Always mount the controller as shown, with the
heat-sink fins aligned vertically.
Note:
If 75A heat sink is ordered D6 (Digital Input) will be factory
set and used as the SSR over temperature shut-down.
ST_ L - _ _ _ _ - _ _ _ _
all
L3
K3
J3
A1
L4
T2
-
S2
+
R2
Process
0 to 10VÎ (dc)
0 to 50mVÎ (dc)
(Input 2)
L3
K3
J3
A1
L4
+
T2
-
S2
R2
Process
0 to 20 mA
(Input 2)
L3
K3
J3
A1
L4
T2
S3
S2
S1
R2
2-wire 3-wire
RTD
(Input 2)
S2
S3
S1
L3
K3
J3
A1
L4
N.O. (Output 3)
common (Output 3)
N.C. (Output 3)
contactor (Coil 1)
N.O. (Output 4)
T2
S2
R2
Thermocouple
(Input 2)
Limit
+
fuse
load
Output 1 (SSR)
fuse
hot neutral
load
1
Output 1 (SSR)
EZ-ZONE™ ST
Integrated Control Loop
LIMIT
fuse
2
Patent Pending
SSR
STATUS
OUT 3
L3
K3
J3
A1
L4
T2
-
S2
R2
Address
Selection
Control
L2
K2
T1
S1
R1
OUT 2
ON
1 2 3 4
98
99
CF
CD
CE
B5
D6
D5
Controller
L2
K2
T1
-
S1
+
R1
Process
0 to 10VÎ (dc)
0 to 50mVÎ (dc)
(Input 1)
L2
K2
+
T1
-
S1
R1
Process
0 to 20 mA
(Input 1)
L2
K2
T1
S3
S1
S1
R1
2-wire 3-wire
(Input 1)
S2
S3
S1
RTD
N.O. (Output 2)
L2
common (Output 2)
K2
T1
S1
R1
Thermocouple
(Input 1)
-
+
L2
K2
T1
S1
R1
Watl o w E Z- Z O NE® S T • 10 • Cha p ter 2 In s tal l a n d Wir e
h
h
ot
ot
fuse
fuse
load
Output 1 (SSR)
hot neutral
Ground Connection
Connect the ground to the heat sink.
load
Output 1 (SSR)
fuse
1
EZ-ZONE™ ST
Integrated Control Loop
LIMIT
Patent Pending
SSR
There is no ground connection on models without a heat sink.
2
Indicator
Lights
STATUS
L3
K3
J3
A1
L4
T2
S2
R2
OUT 3
Address
Selection
Control
L2
K2
T1
S1
R1
OUT 2
ON
1 2 3 4
Power
98
Power Power
99
common (RUI)
CF
T-/R- (RUI)
CD
T+/R+ (RUI)
CE
- common (Digital I/O)
B5
+ Digital Input 6 or Output 6
D6
+ Digital Input 5 or Output 5
D5
ST_ _ - _ _ A _ - _ _ _ _
Remote User Interface
(RUI)
Power
98
99
common (Modbus RTU)
CC
T-/R- (Modbus RTU)
CA
T+/R+ (Modbus RTU)
CB
- common (Digital I/O)
B5
+ Digital Input 6 or Output 6
D6
+ Digital Input 5 or Output 5
D5
ST_ _ - _ _ M _ - _ _ _ _
Modbus RTU on EIA-485
Note:
The control common terminal and the digital
common terminal are referenced to different
voltages and must remain isolated.
Note:
If 75A heat sink is ordered D6
(Digital Input) will be factory set
and used as the SSR over temperature shut-down.
W a tl o w E Z-Z O NE® S T • 11 • Cha p ter 2 In s tal l a n d Wir e
current
1
4
2
5
3
6
contactor
contacts
SSR
current
sensor
to pin 3
below
to pin 6
below
contactor
coil
A1
A2
98
99
Limit Power
1
4
2
5
contactor
contact
SSR
current
sensor
to pin 3
below
to pin 6
below
1
4
2
5
contactor
contact
SSR
current
sensor
to pin 3
below
to pin 6
below
sensor
1
2
to pin 3
below
A2
contactor
contact
to pin 6
below
A1
99
4
5
SSR
Limit Power
contactor
coil
98
Internal wiring in an ST
with a single-pole contactor
without a limit (ST _ B - B _
_ _ - _ _ _ _).
Use single-pole contactors
for hot-to-neutral loads.
NEC does not permit neutral to be switched.
Use double-pole contactors
for hot-to-hot loads. Both
hot legs must be opened together on limit conditions to
remove power from circuit.
Internal wiring in an ST
with a double-pole contactor
without a limit (ST _ B - F _
_ _ - _ _ _ _).
3
user-supplied
safety switch
output 4
internal relay
normally open
6
L4
A1
contactor
coil
98
99
You may remove
the factory-installed
Limit Power
jumper between A1
and L4 to install a
safety switch for the
limit relay (ST _ L - _
_ _ _ - _ _ _ _).
A2
K2
A1
L2
contactor
coil
98
99
Limit Power
(Dotted lines repre-
You can use output 2
(L2 and K2) to deactivate the contactor coil
on an ST without a
limit (ST _ B - _ _ _ _
- _ _ _ _).
(Dotted lines represent internal wiring.)
sent internal wiring.)
3
3
6
6
Watl o w E Z- Z O NE® S T • 12 • Cha p ter 2 In s tal l a n d Wir e
N.O. (Output 4)
1
L3
K3
J3
A1
L4
T2
S2
R2
EZ-ZONE™ ST
Integrated Control Loop
LIMIT
OUT 3
L2
K2
limit relay
T1
S1
R1
Patent Pending
SSR
STATUS
OUT 2
ON
1 2 3 4
2
Power
98
fuse
Power
99
CF
contactor
CD
coil
CE
B5
D6
D5
System with a limit using an external
contactor (ST _ L - A _ _ _ - _ _ _ _).
System (with optional RUI) using the
auxiliary terminals (20 A maximum) to
operate a secondary load.
customer supplied
limit contactor
hot
120VÅ (ac)
neutral
Do not switch or
fuse neutral wire!
fuse
fuse
EZ-ZONE™ ST
Patent Pending
Integrated
4
20 A
maximum
1
Control Loop
2 5
+
–
R2
+
-
R1
+
-
D6
D5
B5
earth
ground
L3K3J3A1L4T2S2
LIMIT
K2T1S1
CE
OUT 3
L2
Address
Selection
ON
SSR
STATUS
OUT 2
1 2 3 4
CD
CF
98
99
3
6
1
L3
K3
J3
A1
L4
T2
S2
R2
Integrated Control Loop
LIMIT
OUT 3
EZ-ZONE™ ST
L2
K2
T1
S1
R1
Patent Pending
SSR
STATUS
OUT 2
ON
1 2 3 4
2
98
99
CF
CD
CE
B5
D6
D5
Sub-assembly Labels
Controller label.
Top Level
Module
ST??-??? ?-????
SEE MANUAL 0600-0052-0000
??? V~50/60 Hz 140VA MAX
STRC-0???-?? ??
SN:??????DC:????
US PAT. 6005577;
D553098; D555601; D555606
Base label.
ST??-????-????
SEE MANUAL
0600-0052-0000
STRT-BASE-????
SN:??????
DC:????
SEE PATENT CHART
zone 1
The model number at the top of each
label identifies the controller configuration.
See Ordering Information and Model Numbers in the Appendix for more detailed information.
ST _ _ - _ L _ _ - _ _ _ _ 24 to 28V ‡ (ac/dc)
ST _ _ - _ H _ _ - _ _ _ _ 100 to 240V ‡ (ac/dc)
ST _ _ - _ 1 _ _ - _ _ _ _ 24VÅ (ac)
ST _ _ - _ 2 _ _ - _ _ _ _ 120VÅ (ac)
ST _ _ - _ 3 _ _ - _ _ _ _ 208 to 240VÅ (ac)
Heat sink label.
ST??-????-????
SCCR 200KA TYPE 2
SEE MANUAL
0600-0052-0000
Heat
Sink
Base
STRT-HS??-000?
DC:???? SN:??????
Patent Numbers
ST??-????-B???
ST??-????-C???
ST??-A???-????
ST??-[B,F]??-????
SEE PATENT CHART
US PAT. 5598322;
D531138
US PAT. 5598322;
D529874
US PAT. D553581;
D558683
US PAT. D553094;
D553099
W a tl o w E Z-Z O NE® S T • 13 • Cha p ter 2 In s tal l a n d Wir e
Installation
Mounting and Dismounting the Controller from a DIN Rail
To mount the controller on a DIN rail, first
hook the top flange on the back of the heat
sink on to the top of the DIN rail. Then
rotate the controller to an upright position
until the lower flange snaps into place.
Note:
Typically, the DIN rail is mounted before com-
ponents are mounted on it.
To dismount the controller, first use a
screwdriver to pull down the small lever on the bottom of the heat sink and
rotate the bottom of the controller forward. Then lift the the controller off of
the rail.
Watl o w E Z- Z O NE® S T • 14 • Cha p ter 2 In s tal l a n d Wir e
Replacing the Solid-State Relay
on a Controller without a Contactor (ST _ _-A _ _ _-_ _ _ _)
1. Pinch the release levers on the top and
bottom of the control module and lift the
bottom edge forward to detach the unit.
4. Using a Phillips screwdriver, remove the
two screws connecting the solid-state relay
to the heat sink.
2. With a Phillips screwdriver, remove
the four nearest screws that were under the module.
Note:
For controller models without a contactor (ST _ _-A _ _ _-_ _ __),
the solid-state relay must be mounted with the larger power
terminals on the top and the smaller control terminals on the bot tom.
3. Lift the controller body, exposing
the solid-state relay.
Replacing the Solid-State Relay
1. Using a Phillips screwdriver, replace
the two screws connecting the solidstate relay to the heat sink.
2. Place the controller body over the
solid-state relay and, using a Phillips
screwdriver, replace the four screws
securing it.
3. Snap the control module in place,
bottom edge first.
Note:
Factory calibration is done using control and base modules as
matched pairs. Due to this fact, current detection (if turned on) may
not read accurately if a control module is placed into another base
module.
W a tl o w E Z-Z O NE® S T • 15 • Cha p ter 2 In s tal l a n d Wir e
Replacing the Solid-State Relay
on a Controller with a Contactor (ST _ _ - (B or F) _ _ _ - _ _ _ _)
1. Pinch the release levers on the top and
bottom of the control module and lift the
right edge forward to detach the unit.
3. With a Phillips screwdriver, remove
the two screws at the top corners of the
controller.
Replacing the Solid-state Relay
1. Using a Phillips screwdriver, replace
the two screws connecting the solidstate relay to the heat sink. Check that
the bottom of the solid-state relay is on
the left.
2. Place the controller body over the
solid-state relay and, using a Phillips
screwdriver, replace the six screw securing it.
3. Snap the control module in place,
left edge first.
4. Lift the controller body, exposing
the solid-state relay.
2. With a Phillips screwdriver, remove
the four nearest screws that were under
the module.
5. Using a Phillips screwdriver, remove
the two screws connecting the solidstate relay to the heat sink.
Note:
For controller models with a contactor (ST _ _-A _ _ _-_ _ _ _), the
solid-state relay must be mounted with the larger power terminals on
the right and the smaller control terminals on the left.
Watl o w E Z- Z O NE® S T • 16 • Cha p ter 2 In s tal l a n d Wir e
Indicator Lights and Slot Identification
Limit:
Indicates that the controller is
in a limit state.
Output 3:
Indicates that output 3 is in
an on state.
1
L3
K3
J3
A1
L4
T2
S2
R2
Slot A
EZ-ZONE™ ST
Integrated Control Loop
LIMIT
OUT 3
Address
Selection
Control
L2
K2
T1
S1
R1
Patent Pending
SSR
STATUS
OUT 2
ON
1 2 3 4
2
Solid-State Relay:
Indicates that the solid-state
relay is in an on state.
Status:
Flashing green indicates the
98
99
CF
CD
CE
B5
D6
D5
Slot CSlot B
controller is running with no
input errors.
Flashing red indicates an input
error.
No flashing indicates that the
controller is not functioning.
Output 2:
Indicates that output 2 is in an
on state.
Controller Power Supply
20 to 26VÎ (dc)
20 to 26VÅ (ac)
85 to 264VÅ (ac)
Safety Isolation
Mechanical Relay,
Solid-State Relay,
Outputs
Safety Isolation
Safety Isolation
ST Isolation Block
Controller
Low Voltage Power Bus
No Isolation
No Isolation
Low-voltage
Isolation
Low-voltage
Isolation
Digital Inputs & Outputs
5-6
Analog Input 1
Analog Input 2
Communications Ports
Low-voltage Isolation: 42V peak
Safety Isolation: 2300VÅ (ac)
W a tl o w E Z-Z O NE® S T • 17 • Cha p ter 2 In s tal l a n d Wir e
Ó
Slot B
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 electrical sensors or peripheral
devices. Failure to do so may
result in damage to equipment and property, and/or
injury or loss of life.
Power
Slot C
98
99
CF
CD
CE
B5
D6
D5
power
power
fuse
• Minimum/Maximum Ratings
• 85 to 264VÅ (ac)
• 20.4 to 26.4 VÅ (ac) / VÎ (dc)
• 47 to 63 Hz
• 12VA maximum power consumption without mechanical contactor in
• 50VA maximum power consumption with mechanical contactor in
Input 1 Thermocouple
system
system, 140VA if using external contactor
NOTE: To prevent ground
loops, isolation needs to be
maintained from input to output when using switched DC
or analog process outputs.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
Slot B
-
S1
+
R1
Input 1 RTD
S3
S1
S1
R1
2-wire
Input 1 Process
Slot B
• 20 kΩ maximum source resistance
• >20 MΩ input impedance
• 3 microampere open-sensor detection
• Thermocouples are polarity sensitive. The negative lead (usually
red) must be connected to S1.
• To reduce errors, the extension wire for thermocouples must be
of the same alloy as the thermocouple.
ST _ _ - _ _ _ _ - _ _ _ _ (all)
• platinum, 100 and 1,000 Ω @ 0°C
• calibration to DIN curve (0.00385 Ω/Ω/°C)
• 20 Ω maximum lead resistance
• RTD excitation current of 0.09 mA typical. Each
ohm of lead resistance may affect the reading by
0.03°C.
• For 3-wire RTDs, the S1 lead (usually white) must
be connected to R1.
• For best accuracy use a 3-wire RTD to compensate
for lead-length resistance. All three lead wires must
have the same resistance.
ST _ _ - _ _ _ _ - _ _ _ _ (all)
S2
S3
S1
Slot B
T1
S1
R1
3-wire
Slot B
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
+
T1
-
S1
+
R1
volts
-
S1
amperes
• 0 to 20 mA @ 100 Ω input impedance
• 0 to 10VÎ (dc) @ 20 kΩ input impedance
• 0 to 50 mVÎ (dc) @ 20 kΩ input impedance
• scalable
ST _ _ - _ _ _ _ - _ _ _ _ (all)
Watl o w E Z- Z O NE® S T • 18 • Cha p ter 2 In s tal l a n d Wir e
Ó
Input 2 Thermocouple
Slot A
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 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.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
-
S2
+
R2
Input 2 RTD
Slot A
S3
S2
S1
R2
2-wire
Input 2 Process
Slot A
-
S2
+
R2
volts
• 20 kΩ maximum source resistance
• >20 MΩ input impedance
• 3 microampere open-sensor detection
• Thermocouples are polarity sensitive. The negative lead (usually
red) must be connected to S2.
• To reduce errors, the extension wire for thermocouples must be
of the same alloy as the thermocouple.
ST _ L - _ _ _ _ - _ _ _ _ (limit)
S2
S3
S1
+
-
Slot A
T2
S2
R2
3-wire
Slot A
T2
S2
amperes
• platinum, 100 and 1,000 Ω @ 0°C
• calibration to DIN curve (0.00385 Ω/Ω/°C)
• 20 Ω maximum lead resistance
• RTD excitation current of 0.09 mA typical. Each
ohm of lead resistance may affect the reading by
0.03°C.
• For 3-wire RTDs, the S1 lead (usually white) must
be connected to R2.
• For best accuracy use a 3-wire RTD to compensate
for lead-length resistance. All three lead wires must
have the same resistance.
ST _ L - _ _ _ _ - _ _ _ _ (limit)
• 0 to 20 mA @ 100 Ω input impedance
• 0 to 10VÎ (dc) @ 20 kΩ input impedance
• 0 to 50 mVÎ (dc) @ 20 kΩ input impedance
• scalable
ST _ L - _ _ _ _ - _ _ _ _ (limit)
Watl o w E Z- Z O NE® S T • 19 • Cha p ter 2 In s tal l a n d Wir e
Ó
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 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.
Digital Input 5 - 6
Slot C
common
B5
DC Input
D6
DC Input
D5
Digital Input
• Update rate 1 Hz
• Dry contact or dc voltage
DC Voltage
• Input not to exceed 36V at
3 mA
• Input active when > 3V @
0.25 mA
• Input inactive when < 2V
Dry Contact
• Input inactive when >
500 Ω
• Input active when < 100 Ω
• maximum short circuit 13
mA
ST [B, C, D or E] _- _ _ _ _-_
_ _ _
Voltage Input
_
B
Vdc
_
D
Dry Contact
_
B
_
D
common
common
24 Vdc
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
Watl o w E Z- Z O NE® S T • 20 • Cha p ter 2 In s tal l a n d Wir e
Ó
fuse
neutral
hot
fuse
fuse
1
4
2 5
EZ-ZONE™ ST
Patent Pending
Integrated
Control Loop
1 2 3 4
ON
LIMIT
OUT 3
SSR
STATUS
OUT 2
hot
hot
hot hot
80
Safe Operating Area
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 electrical sensors or peripheral
devices. Failure to do so may
result in damage to equipment and property, and/or
injury or loss of life.
Output 1 Solid-State Relay with a Contactor
3
6
See Quencharc note.
ST _ _ - B _ _ _ - _ _ _ _ (contactor)
earth
ground
Output 1 (SSR)
load
Output 1 Solid-State Relay without a Contactor
NOTE: To prevent ground
loops, isolation needs to be
maintained from input to output when using switched DC
or analog process outputs.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
fuse
fuse
hot neutral
See Quencharc note.
ST _ _ - A _ _ _ - _ _ _ _ (no contactor)
2
load
load
fuse
1
Output 1 (SSR)
Output 1 (SSR)
EZ-ZONE™ ST
Integrated Control Loop
Solid-State Relay Derating Curve
70
60
50
40
Amps RMS
30
20
10
0
0
5
201510
25
75 amps at 50 ºC
40 amps at 50 ºC
25 amps at 50 ºC
30
Ambient Temperatue (oC)
40 45
35
50
55 60 65 70
75
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical
relay, solid state relay or
open collector output options
requires use of an R.C. suppressor.
Watl o w E Z- Z O NE® S T • 21 • Cha p ter 2 In s tal l a n d Wir e
Ó
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 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.
Output 2 Mechanical Relay, Form A
• 5 A at 240VÅ (ac) or 30VÎ (dc)
maximum resistive load
• 20 mV at 24V minimum load
• 125 VA pilot duty @ 120/240VÅ
(ac), 25 VA at 24VÅ (ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST (H, D, J, C) _ - _ _ _ _ - _ _ _ _
normally open
common
Slot B
L2
K2
Output 2 Solid-State Relay, Form A
• 0.5 A at 20 to 264VÅ (ac) maximum resistive load
• 20 VA 120/240VÅ (ac) pilot duty
• opto-isolated, without contact
suppression
• maximum off state leakage of
105 microamperes
• Output does not supply power.
• Do not use on dc loads.
See Quencharc note.
ST (K, B, P, E) _ - _ _ _ _ - _ _ _ _
normally open
common
Slot B
L2
K2
L2
K2
L2
K2
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical
relay, solid state relay or
open collector output options
requires use of an R.C. suppressor.
Output 3 Mechanical Relay, Form C
normally open
common
normally closed
L3
K3
J3
Slot A
• 5 A at 240VÅ (ac) or 30VÎ (dc)
maximum resistive load
• 20 mA at 24V minimum load
• 125 VA pilot duty at 120/240VÅ
(ac), 25 VA at 24VÅ (ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST _ L - _ _ _ _ - _ _ _ _ (limit)
Output 4 Mechanical Relay, Form A
Slot A
• 2 A at 240VÅ (ac) or 30VÎ (dc)
maximum resistive load
• 20 mV at 24V minimum load
common
normally open
A1
L4
• 125 VA pilot duty at 120/240VÅ
(ac), 25 VA at 24VÅ (ac)
• 100,000 cycles at rated load
• Output does not supply power.
• for use with ac or dc
See Quencharc note.
ST _ L - _ _ _ _ - _ _ _ _ (limit)
L3
normally open
K3
common
J3
normally closed
L4
A1
Watl o w E Z- Z O NE® S T • 22 • Cha p ter 2 In s tal l a n d Wir e
Ó
Slot C
User Load
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 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.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
Digital Output 5 - 6
98
99
CF
CD
CE
common
B5
collector out
D6
collector out
D5
Quencharc Wiring Example
In this example the Quencharc
circuit (Watlow part# 0804-0147-
0000) is used to protect ST internal circuitry from the counter
electromagnetic force from the inductive user load when de-engergized. It is recommended that this
or an equivalent Quencharc be
used when connecting inductive
loads to ST outputs.
• Internal supply provides a constant power
output of 750mW
• Maximum output sink
current per output is
1.5A (external class
2 or SELV supply required)
• Total sink current for
all outputs not to exceed 8A
• Do not connect outputs
in parallel
ST [B, C, D or E] _- _ _
_ _-_ _ _ _
L
K
24 Vdc
_
_
common
Quencharc
_
B
_
D
N
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
Quencharc Note:
Switching pilot duty inductive
loads (relay coils, solenoids,
etc.) with the mechanical
relay, solid state relay or
open collector output options
requires use of an R.C. suppressor.
Watl o w E Z- Z O NE® S T • 23 • Cha p ter 2 In s tal l a n d Wir e
Ó
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 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.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
Standard Bus EIA-485 Communications
Slot C
98
99
CF
CD
CE
B5
D6
D5
common
T-/R-
T+/R+
• Wire T-/R- to the A terminal of
the EIA-485 port.
• Wire T+/R+ to the B terminal of
the EIA-485 port.
• Wire common to the common
terminal of the EIA-485 port.
• Do not route network wires
with power wires. Connect network wires in daisy-chain fashion when connecting multiple
devices in a network.
• Do not connect more than 16
controllers on a network.
• maximum network length:
1,200 meters (4,000 feet)
• 1/8th unit load on EIA-485 bus
ST _ _ - _ _ * _ - _ _ _ _
* All models include Standard Bus
communications
Modbus RTU or Standard Bus EIA-485 Communications
• Only one protocol per port is
available at a time: either Modbus RTU or Standard Bus.
• Do not connect more than 16
controllers on a Standard Bus
network.
• Do not connect more than 247
controllers on a Modbus RTU
network.
• maximum network length:
1,200 meters (4,000 feet)
• 1/8th unit load on EIA-485 bus.
ST _ _ - _ _ M _ - _ _ _ _ (Modbus
RTU or EIA-485)
Slot C
98
99
CC
CA
CB
B5
D6
D5
common
T-/R-
T+/R+
• Wire T-/R- to the A terminal of
the EIA-485 port.
• Wire T+/R+ to the B terminal of
the EIA-485 port.
• Wire common to the common
terminal of the EIA-485 port.
• Do not route network wires
with power wires. Connect network wires in daisy-chain fashion when connecting multiple
devices in a network.
• A termination resistor may be
required. Place a 120 Ω resistor
across T+/R+ and T-/R- of last
controller on network.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
Note: Excessive writes to
EEPROM over Modbus can
cause premature EEPROM
failure. The EEPROM is rated
for 1,000,000 writes. See
"Saving Settings to Nonvolatile Memory" in Chapter 2,
Install and Wire.
Modbus-IDA
Terminal
DO A CA or CD T-/R-
D1 B CB or CE T+/R+
common common CC or CF common
EIA/TIA-485
Name
Watlow Termi-
nal Label
Function
Watl o w E Z- Z O NE® S T • 24 • Cha p ter 2 In s tal l a n d Wir e
Ó
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 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.
CAUTION: Always mount the
controller with the heat-sink
fins aligned vertically.
NOTE: Terminals L4 and
A1 on the limit connector
are jumpered at the factory
to complete the contactor
circuit. Additional switches
may be wired in series to the
terminals.
Ó
WARNING: If high voltage is
applied to a low-voltage controller, irreversible damage
will occur.
Note: Excessive writes to
EEPROM over Modbus can
cause premature EEPROM
failure. The EEPROM is rated
for 1,000,000 writes. See
"Saving Settings to Nonvolatile Memory" in Chapter 2,
Install and Wire.
Wiring a Serial EIA-485 Network
Do not route network wires with power wires. Connect network wires in
daisy-chain fashion when connecting
multiple devices in a network.
A termination resistor may be re-
quired. Place a 120 Ω resistor across
A network using Watlow's Standard Bus and an RUI/Gateway.
EZ-ZONE ST
ST_ _ - _ _ A _ -_ _ _ _
CD
CE
CF
D6
D5
B5
RUI/Gateway
EZKB-_ A _ _- _ _ _ _
A network with all devices configured using Modbus RTU.
EZ-ZONE ST
ST_ _ -_ _ M _ -_ _ _ _
D6
D5
98
99
+ B
- A
power
power
common
EZ-ZONE PM
CC
CB
CA
B5
99
+ B
- A
common
EZ-ZONE PM
98
power
PLC
power
98
power
99
com
CF
- A
CD
+ B
CE
B5
D6
D5
98
power
99
common
CF
- A
CD
+ B
CE
T+/R+ and T-/R- of the last controller
on a network.
Only one protocol per port is available at a time: either Modbus RTU or
Standard Bus.
Note:
Do not route network wires with power
wires.
Power
Supply
fuse
Power
Supply
fuse
power
98
power
99
com
CC
- A
CA
+ B
CB
B5
D6
D5
power
power
common
- A
+ B
EZ-ZONE RM
l
o
S
98
99
CD
CF
power
common
- A
+ B
common
t
C
CZ
CX
CY
CE
EZ-ZONE RM
t
l
o
S
98
99
CA
CC
power
- A
+ B
C
CB
CZ
CX
CY
Watl o w E Z- Z O NE® S T • 25 • Cha p ter 2 In s tal l a n d Wir e
Setting the Address
Modbus Controller Address
The address of an EZ-ZONE® ST controller with the
Modbus option (ST _ _-_ _ M _-_ _ _ _) can be set to
ranges from 1 to 8 using the DIP switch and ranges
1 to 247 using software.
Set switch 4 to on to use Modbus communications.
Modbus™ RTU addresses from 1 to 247 can be programmed into the controller using Standard bus
communications. Only one controller can be connected to the network while changing the address
using communications. After the Modbus address is
changed, all four DIP switches must be turned on
(set to 8) and the controller restarted for the new address be become available on the Modbus network.
The Modbus addresses set by software will override
only address 8, but lower addresses set on the DIP
switch will override the software-assigned addresses.
As many as 247 controllers can be connected to a
network.
The Standard bus address of an EZ-ZONE ST controller with the Modbus™ RTU option (ST _ _-_ _ M
_-_ _ _ _) ranges from 1 to 8, because DIP switch 4 is
reserved for switching Modbus on or off.
DIP Switch
Zone 1 2 3 **4
1 off off off on
2 on off off on
3 off on off on
4 on on off on
5 off off on on
6 on off on on
7 off on on on
**8 on on on on
**1 to 247 on on on on
** Set switch 4 to on to use Modbus communications. Modbus addresses from 1 to 247 can be programmed into the
controller using Standard bus communications when switch
4 is off. After the Modbus address is changed, all four DIP
switches must be turned on (set to 8) for the new address to
become available on the Modbus network.
1
L3
K3
J3
A1
L4
T2
S2
R2
EZ-ZONE™ ST
Integrated Control Loop
LIMIT
OUT 3
Address
Selection
Control
L2
K2
T1
S1
R1
Patent Pending
SSR
STATUS
OUT 2
ON
1 2 3 4
2
98
99
CF
CD
CE
B5
D6
D5
Communica-
tions
Parameter
Name
Address (when
all four DIP
switches are set
to on)
Baud * 9,600 (188)
Parity Even (191)
Word Order * Lowhigh (1331)
Non-Volatile
Save
(ST Firmware 2
and higher)
* Defaults
Range
* 1 to 247 Map 1 Map 2
19,200 (189)
38,400 (190)
Odd (192)
* None (61)
Highlow (1330)
* Yes (106)
No (59)
Modbus
(less 400,001
offset)
313 2052
Map 1 Map 2
314 2054
Map 1 Map 2
315 2056
Map 1 Map 2
- - - - 2058
Map 1 Map 2
317 2084
Data
Type
&
Read/
Write
uint
RW
uint
RWE
uint
RWE
uint
RWE
uint
RWE
Note:
Changing the Modbus parameters listed above
must be done over Modbus using ST firmware re lease 2.0 and earlier. For firmware release 3.0 and
above using either an RUI or EZ-ZONE Configura tor software, navigate to the Setup Page and then
to the Com [Com] (RUI representation) menu to
change.
CAUTION:
Changes set over Modbus are immediate. Users will
not be able to communicate with the controller after
its address, parity or baud rate has been changed.
The master device will need to be re-configured to
the new settings.
Saving Settings to Nonvolatile Memory
When controller settings are entered using the optional RUI, changes are always saved to Non-volatile
Memory (EEPROM). If the controller loses power or
is switched off, its settings will be restored when it
starts again.
The EEPROM will wear out after about 1,000,000
writes, which would not be a problem with changes
made from the RUI. However, if the controller is receiving changing instructions from a PLC or a computer through a network connection, the EEPROM
could, over time, wear out. The Non-volatile Memory
Save parameter allows the user to save settings
made over the network to either volatile or nonvolatile memory.
By default, settings made through the network
are saved to non-volatile memory.
Note:
Changing Non-volatile Memory Save must be done
over the network using ST firmware release 2.0
and earlier. For firmware release 3.0 and above us ing either an RUI or EZ-ZONE Configurator soft ware, navigate to the Setup Page and then to the
Com [Com] (RUI representation) menu to change.
Watl o w E Z- Z O NE® S T • 26 • Cha p ter 2 In s tal l a n d Wir e
Watlow Standard Bus Controller Address
The address of an EZ-ZONE ST controller using
Standard Bus exclusively (ST_ _ - _ _ A _ - _ _ _ _ )
ranges from 1 to 16, where up to 16 controllers can be
connected on the Standard Bus network.
DIP Switch
Zone 1 2 3 *4
1 off off off off
2 on off off off
3 off on off off
4 on on off off
5 off off on off
6 on off on off
7 off on on off
8 on on on off
*9 off off off on
*10 on off off on
*11 off on off on
*12 on on off on
*13 off off on on
*14 on off on on
*15 off on on on
*16 on on on on
Header Name Definition
Identifies unique param-
Profibus Index
eters using Profibus DP
protocol (further explanation below).
Identifies unique param-
Parameter ID
eters used with other software such as, LabVIEW.
Identifies unique relative
Modbus (RTU or TCP) ad-
RUI/GTW Modbus
dresses when using the
Remote User Interface /
Gateway.
uint = Unsigned 16 bit
integer
dint = Signed 32-bit,
long
string = ASCII (8 bits
Data Type R/W
per character)
float = IEEE 754 32-bit
RWES = Readable
Writable
EEPROM (saved)
User Set (saved)
Conventions Used in the Menu Pages
To better understand the menu pages that follow
review the naming conventions used. When encountered throughout this document, the word "default"
implies as shipped from the factory. Each page (Operations, Setup, Profile and Factory) and their associated menus have identical headers defined below:
Header Name Definition
Display
Parameter Name
Range
Default
Modbus Relative Address
CIP (Common Industrial Protocol)
Visually displayed information from the control.
Describes the function of
the given parameter.
Defines options available
for this prompt, i.e., min/
max values (numerical),
yes/no, etc... (further explanation below).
Values as delivered from
the factory.
Identifies unique addresses when using either the
Modbus RTU or Modbus
TCP protocols (further explanation below).
Identifies unique parameters using either the
DeviceNet or EtherNet/IP
protocol (further explanation below).
If Using Optional RUI (Display)
Visual information from the control is displayed to
the observer using a fairly standard 7 segment display. Due to the use of this technology, several characters displayed need some interpretation, see the list
below:
[1]= 1 [0]= 0 [i]= i [r]= r
[2= 2 [a]= A [j]= J [S]= S
[3]= 3 [b]= b [H]= K [t]= t
[4]= 4 [c], [C]= c [l]= L [U]= u
[5]= 5 [d]= d [m]= M [u]= v
[6]= 6 [e]= E [n]= n [w]= W
[7]= 7 [f]= F [o]= o [y]= y
[8]= 8 [g]= g [p]= P [2]= Z
[9]= 9 [h]= h [q]= q
Range
Within this column notice that on occasion there will
be numbers found within parenthesis. This number
represents the enumerated value for that particular
selection. Range selections can be made simply by
writing the enumerated value of choice using any of
the available communications protocols. As an example, turn to the Setup Page and look at the Analog
Input [`Ai] menu and then the Sensor Type [Sen]
prompt (instance 1). To turn the sensor off using
Modbus simply write the value of 62 (off) to register
400043 (Map 1) or register 400369 (Map 2) and send
W a tl o w E Z-Z O NE® S T • 27 • Cha p ter 2 In s tal l a n d Wir e
that value to the control.
Communication Protocols
All EZ-ZONE ST controllers come standard with
the Standard Bus protocol. As a option it can also
be delivered with the Modbus protocol as well. The
Standard Bus protocol is used primarily for communications to other EZ-ZONE products to include the
RUI and EZ-ZONE Configurator software (free download from Watlow's web site (http://www.watlow.com).
Other protocols that can be used to communicate
with the ST are available when used in conjunction
with the optional Remote User Interface/Gateway
(RUIGTW).
- Modbus RTU 232/485
- EtherNet/IP, Modbus TCP
- DeviceNet
- Profibus DP
If interested in learning more about the RUI/GTW
download the RUI/Gateway User Manual by pointing
your browser to:
http://www.watlow.com/literature/pti_search.cfm?dltype=5
Once there move to the bottom of the page and enter
EZ-ZONE into the Keyword field and then click the
search button.
Modbus RTU & Modbus TCP Protocols
All Modbus registers are 16-bits and as displayed in
this manual are relative addresses (actual). Some
legacy software packages limit available Modbus registers to 40001 to 49999 (5 digits). Many applications
today require access to all available Modbus registers
which range from 400001 to 465536 (6 digits). Watlow
controls support 6 digit Modbus registers. For parameters listed as float notice that only one (low order) of
the two registers is listed, this is true throughout this
document. By default the low order word contains the
two low bytes of the 32-bit parameter. As an example,
look in the Operations Page for the Process Value.
Find the column identified in the header as Modbus
and notice that it lists register 19 (instance 1, Map 1)
and register 360 (instance 1, Map 2). Because this parameter is a float instance 1 Map 1 is actually represented by registers 19 (low order bytes) and 20 (high
order bytes), likewise, instance 1 Map 2 is actually
represented by registers 360 (low order bytes) and
361 (high order bytes). Because the Modbus specification does not dictate which register should be high
or low order Watlow provides the user the ability to
swap this order (Setup Page, [Com Menu) from the
default low/high [lohi] to high/low [hilo].
Note:
With the release of firmware revision 3.00 and
above new capabilities (phase angle control, user
programmable memory blocks, etc...) where introduced into this product line. With the introduction
of these new capabilities there was a repacking of
Modbus registers. Notice in the column identified
as Modbus the reference to Map 1 and Map 2 reg-
isters for each of the various parameters. If the new
capabilities are to be used, be certain to select Map
2 Modbus registers. If the new functions of this
product line are not to be used, Map 1 (legacy ST
controls) Modbus registers will be sufficient. The
Modbus register mapping [map] can be changed
in the Setup Page under the [Com] Menu. This
setting will apply across the control.
It should also be noted that some of the cells in the
Modbus column as well as the RUI/GTW Modbus
column contain wording pertaining to an offset. Several parameters in the control contain more than one
instance; such as, profiles (4), alarms (2), analog inputs (2), etc... The Modbus register shown always represents instance one. Take for an example the Step
Type [styp] parameter found in the Profile Page.
Instance one, Map 1, is shown as address 500 and
+20 is identified as the offset to the next instance. If
there was a desire to read or write to instance 3 simply add 40 to 500 to find its address. In this case, the
instance 3 address for Step Type is 540.
The ST control, when equipped with Modbus has user
programmable memory blocks. To learn more about
this feature click on the link or turn to the Features
section and look for the section entitled "Modbus -
User Programmable Memory Blocks".
Data Types Used with Modbus
unsigned = Unsigned 16 bit integer
signed = Signed 16-bit
float = Float, IEEE 754 32-bit
long = 32 bit unsigned integer
sint = Signed 8 bits , byte
To learn more about the Modbus protocol point your
browser to http://www.modbus.org.
Common Industrial Protocol (CIP)
DeviceNet & Ethernet/IP
Both DeviceNet and EtherNet/IP use open object
based programming tools and use the same addressing scheme. In the following menu pages notice the
column header identified as CIP. There you will find
the Class, Instance and Attribute in hexadecimal,
(decimal in parenthesis) which makes up the addressing for both protocols.
The ST control has a feature that allows for implicit
messaging when used in conjunction with an RUI/
GTW equipped with a DeviceNet or EtherNet/IP
card. To learn more about this feature click on the
link or turn to the Features section and look for the
section entitled "CIP - Communications Capabilities".
Watl o w E Z- Z O NE® S T • 28 • Cha p ter 2 In s tal l a n d Wir e
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