Watlow EZ-ZONE ST Specifications

SPECIFICATION SHEET

EZ-ZONE® ST

EZ-ZONE® ST Integrated
Control Loop Makes
Solving the Thermal
Requirements of Your
System Easy

The EZ-ZONE® ST integrated solid state controller from
Watlow® offers a complete thermal system control solution
in a single package. Features include a PID temperature
controller connected to a high-amperage solid state relay
with the option of adding a properly sized heat sink, an
over- and under-temperature limit, a power shut-down
contactor, digital communications and a remote user
interface in one complete and professionally engineered
product.

Because the system is modular and scalable, a user only pays
for what is needed. Stacking the EZ-ZONE ST integrated
controller into multiple configurations enables flexibility to
standardize the product platform to solve a wide range of
application needs.

This integrated controller also includes 200KA short circuit
current rating (SCCR) tested up to 480VAC to minimize
damage in the event of a short circuit when used with
required fusing.

Features and Benefits

Back panel or DIN-rail mount

• Provides several mounting options

Compact package

• Reduces panel size

Touch-safe package

• Complies to IP2X increasing user safety

±0.1 percent temperature accuracy

• Provides efficient and accurate temperature control

200KA SCCR with proper fusing

• Minimizes damage in the event of a short circuit

Agency approvals: UL®, CSA, CE, RoHS, W.E.E.E.

• Meets applications requiring agency approvals

Three-year warranty

• Ensures Watlow’s reliability and product support

Off-the-shelf designed system solution

• Improves system reliability and termination reduction

• Reduces installation cost

• Eliminates incompatibility headaches often encountered

with using many different components and brands

EZ-ZONE ST

75 ampere configuration

EZ-ZONE ST

40 ampere full configuration

with mechanical contactor

EZ-ZONE ST

configuration with only

the controller and SSR

Features and Benefits (con’t)

Profile capability

• Includes ramp and soak with four files and 40 total steps

Ability to communicate with programmable logic controller
(PLC), personal computer (PC) or operator interface (OIT)

• Optional EIA 485 Modbus® RTU

• RUI/communications gateway with optional EIA 232/485

Modbus® RTU, EtherNet IP™/TCP Modbus®, DeviceNet™ or
PROFIBUS DP

Solid state relay output

• Allows faster cycling, more precise control, increased heater

life and energy efficiency

• Ability to handle up to 75 amperes

• Uses either zero-cross or phase angle control modes for

flexibility to control resistive loads such as nichrome,
tungsten or quartz lamps

• Utilizes phase angle control mode to prevent load failure or

blowing fuses for tungsten or quartz loads

PID temperature control

• Allows single input/dual output

• Allows standard PID or adaptive TRU-TUNE®+ tuning

algorithms for demanding controllability requirements

Optional temperature limit

• Increases safety in

Optional definite purpose mechanical contactor

• Enables circuit safety shut down driven by limit control or

PID alarm output signal

Optional current monitoring feature

• Detects heater current flow and alarm indication of failed

solid state relay (SSR) or heater zone

Optional SSR heat sink

• Sized and engineered for specific applications

• Factory supplied heat sink is UL® listed

System diagnostics

• Provides continuous self-monitoring alerts when there is

any system trouble to reduce maintenance and service costs

PC Software—EZ-ZONE Configurator

• Wizard style configuration of controller settings

• On-line or off-line recipe editing

over- and under-temperature

condition

Multiple U.S. and international patents pending.

Specifications

Line Voltage/Power

• 100 to 240VAC, +10/-15%; (85-264VAC), 50/60Hz, ±5%

• 24VAC/VDC, +10/-15%; 50/60Hz, ±5%

• 12VA max. power consumption without mechanical contactor
in system

• 50VA max. power consumption with mechanical contactor
used in system, 140VA if using external contactor

• Data retention upon power failure via nonvolatile memory
Environment

• 0 to 158°F (-18 to 70°C) operating temperature

• -40 to 185°F (-40 to 85°C) storage temperature

• 0 to 90% RH, non-condensing
Accuracy

• Calibration accuracy and sensor conformity: ±0.1% of span,
±1°C @ the calibrated ambient temperature and rated line
voltage

• Types R, S, B: 0.2%

• Type T below -50°C: 0.2%

• Calibration ambient temperature @ 77°F ±5°F (25°C ±3°C)

• Accuracy span: 1000°F (540°C) min.

• Temperature stability: ±0.1°F/°F (±0.1°C/°C) rise in ambient max.
Agency Approvals

• UL®, CSA, CE (zero cross models only), RoHS, W.E.E.E.

• Limit version features FM approval
Controller

• Microprocessor based user-selectable control modes

• PID module: single universal input, 2 outputs

• Limit module: single universal input, 2 outputs

• Two total additional digital input/outputs shared between PID
and limit functions

• Control sampling rates: input = 10Hz, outputs = 10Hz

• Isolated EIA 485 Modbus® RTU serial communications
Wiring Termination—Touch Safe Terminals

• Input, power and controller output terminals touch safe
removable 12 to 22 AWG

• Power load terminals 6 to 12 AWG

• Tightening torque: 30 in.-lbs
Universal Input

• Thermocouple, grounded or ungrounded sensors

• >20MΩ input impedance

• Max. of 20Ω source resistance

• RTD 2- or 3-wire, platinum, 100Ω and 1000Ω @ 0°C calibration to
DIN curve (0.00385Ω/Ω/°C)

• Process, 0-20mA @ 100Ω, or 0-10VDC @ 20kΩ input impedance;
scalable, 0-50mV

• Inverse scaling
Digital Input

• Update rate: 1Hz

• Dry contact or dc voltage
DC voltage

• Max. input: 36V at 3mA

• Min. high state: 3V at 0.25mA

• Max. low state: 2V

Dry contact

• Max. short circuit: 13mA

• Min. open resistance: 500Ω

• Max. closed resistance: 100Ω
Current Measurement

• Accuracy: typical ±1A, max. error ±3A

• Accuracy and operating range: 0 to 75A

Digital Output

• Update rate: 1Hz

• Output voltage: 24V, current limit 10mA
Allowable Operating Range
Type J: 32 to 1500°F or 0 to 815°C
Type K: -328 to 2500°F or -200 to 1370°C
Type T: -328 to 750°F or -200 to 400°C
Type N: 32 to 2372°F or 0 to 1300°C
Type E: -328 to 1470°F or -200 to 800°C
Type C: 32 to 4200°F or 0 to 2315°C
Type D: 32 to 4200°F or 0 to 2315°C
Type F: 32 to 2543°F or 0 to 1395°C
Type R: 32 to 3200°F or 0 to 1760°C
Type S: 32 to 3200°F or 0 to 1760°C
Type B: 32 to 3300°F or 0 to 1816°C
RTD (DIN): -328 to 1472°F or -200 to 800°C
Process: -1999 to 9999 units
Output Hardware

• User selectable for heat/cool as on-off, P, PI, PD, PID, or alarm
action. Not valid for limit controls

• Electromechanical relay. Form A, rated 2A

• SSR drive: 20-28VDC low side open collector switch

• SSR, Form A, 0.5A @ 24VAC min., 264VAC max., opto-isolated,
without contact suppression

• Electromechanical relay, Form A, rated 5A, auxiliary output on
PID module, output 2

• Electromechanical relay, Form C, rated 5A, auxiliary output on
limit module, output 3

Specifications for Basic Remote User Interface EZKB (RUI)

Operator Interface

• Dual 4 digit, 7 segment LED displays

• Forward, backward, up and down keys plus a customer
programmable function key - EZ key

• Typical display update rate: 1Hz

• Agency approved to IP65/NEMA 4X

• Standard bus (ships with all units). Options:
EIA 232/485
DeviceNet™, PROFIBUS DP

Line Voltage/Power

• 100 to 240VAC, +10/-15%; (85-264VAC) 50/60Hz, ±5%

• 24VAC/VDC, +10/-15%; 50/60Hz, ±5%

Modbus® RTU, EtherNet/IP™/TCP Modbus® or

Specifications for Mechanical Contactor

• Insulation class: UL® Class B 266°F (130°C)

• Min. load of 100 watts

Contact Ratings

Full Load Number Line Locked Resistive Amp Max. Horsepower

Amperes of Poles Voltage Rotor Amps Rating Voltage Single-Phase

40 2 240/277 240 50 120 2

480 200 50 240 3
600 160 50

• Duty cycle: continuous