Watlow EZ-ZONE ST Controller

EZ-Zone ST
Watlow EZ-ZONE ST Controller
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.
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Product Features

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
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 over- and under-temperature condition
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

Product Specifications

  • 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
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
  • 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.
Current Measurement:
  • Accuracy: typical ±1A, max. error ±3A
  • Accuracy and operating range: 0 to 75A
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
Digital Output:
  • Update rate: 1Hz
  • Output voltage: 24V, current limit 10mA
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
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
  • 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
Agency Approvals:
  • UL®, CSA, CE (zero cross models only), RoHS, W.E.E.E.
  • Limit version features FM approval
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 Modbus® RTU, EtherNet/IP™/TCP Modbus® or DeviceNet™, PROFIBUS DP
  • Line Voltage/Power: 100 to 240VAC, +10/-15%; (85-264VAC) 50/60Hz, ±5% 24VAC/VDC, +10/-15%; 50/60Hz, ±5%