Watlow EZ-ZONE
®
ST
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3
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Chapter 1 Overview
Chapter 1: Overview
1
The EZ-ZONE
®
ST Provides Total Ther-
mal System Control
The EZ-ZONE ST solid-state controller offers com-
plete thermal system control in a single package
while reducing system complexity and the cost of
control-loop ownership. You can order a PID control-
ler 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 heat-
sink); 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
• 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.
