Watlow EZ-ZONE
®
ST
•
85
•
Appendix
Line Voltage/Power
• 85 to 264V
Å
(ac), 47 to 63Hz
• 20 to 26V
ı
(ac/dc), 47 to 63Hz
• 12VA maximum power consumption without mechanical contac-
tor in system
• 50VA maximum power consumption with mechanical contactor in
system
• 140VA maximum power consumption with external contactor
• Data retention upon power failure via nonvolatile memory
Environment
(See Derating Curves in Declaration of Conformity)
• -18 to 70°C (0 to 158°F) operating temperature
• -40 to 85°C (-40 to 185°F) storage temperature
• 0 to 90 percent RH, non-condensing
Accuracy
• Calibration accuracy and sensor conformity: ±0.1 percent 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: 25°C, ±3°C (77°F, ±5°F)
• Accuracy span: 540°C (1000°F) minimum
• Temperature stability: ±0.1°C/°C (±0.1°F/°F) rise in ambient
maximum
Agency Approvals
• UL® 508 file E102269, cULus, CE, RoHS, W.E.E.E.
Product is UL recognized when purchased as components. Prod-
uct is UL listed when purchased as a complete assembly.
• CSA approved C22.2#14 file 158031
• 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 additional digital input/outputs shared between PID and
limit functions
• Control sampling rates: input 10 Hz, outputs 10 Hz
• Isolated EIA 485 Modbus
®
RTU serial communications
Wiring Termination Touch-Safe Terminals
• Input, power and controller output terminals touch safe remov-
able 4 to 0.34 mm
2
(12 to 22 AWG), 7.0 lb-in. torque.
• Power load terminals 3.3 to 0.324 mm
2
(6 to 12 AWG) STR 90°C
(194°F) copper conductor only, 3.96 Nm (35 lb-in) torque
• Temperature rating for line and lug loads 90°C (194°F)
Universal Input
• Thermocouple, grounded or ungrounded sensors
• RTD 2- or 3-wire, platinum, 100 Ω @ 0°C calibration to DIN curve
(0.00385 Ω/Ω/°C)
• Process, 0 to 20 mA @ 100 Ω, or 0 to 10V
Î
(dc) @ 20 kΩ input im-
pedance; scalable, 0 to 50 mV
• Inverse scaling
• >20 MΩ input impedance
• Maximum of 20 kΩ source resistance
• Maximum of 20 Ω lead resistance for an RTD
• 42V
Î
(dc) isolation voltage for input 2
Digital Input
• Update rate 1 Hz
• Dry contact or dc voltage
DC voltage
• Maximum input 36V at 3 mA
• Minimum high state 3V at 0.25 mA
• Maximum low state 2V
Dry contact
• Maximum short circuit 13 mA
• Minimum open resistance 500 Ω
• Maximum closed resistance 100 Ω
Current Measurement
• Nominal operating frequency 50 to 60 Hz.
• Accuracy ±15% of displayed value
• Accuracy range 5 to 50 A
• Operating range 2 to 50 A
Digital Output
• Update rate 10 Hz
• Output voltage 24V, current limit 10 mA
Input Accuracy Span Ranges
Type J: 0 to 815°C or 32 to 1500°F
Type K: -200 to 1370°C or -328 to 2500°F
Type T: -200 to 400°C or -328 to 750°F
Type N: 0 to 1300°C or 32 to 2372°F
Type E: -200 to 800°C or -328 to 1470°F
Type C: 0 to 2315°C or 32 to 4200°F
Type D: 0 to 2315°C or 32 to 4200°F
Type F: 0 to 1395°C or 32 to 2543°F
Type R: 0 to 1760°C or 32 to 3200°F
Type S: 0 to 1760°C or 32 to 3200°F
Type B: 0 to 1816°C or 32 to 3300°F
RTD (DIN): -200 to 800°C or -328 to 1472°F
Process: -1999 to 9999 units
Output Hardware
• User selectable for heat-cool as on-off, P, PI, PD, PID, alarm or
limit action.
• Output 1: SSR drive 20 to 28V
Î
(dc) low side open collector
switch
• Output 2: SSR, Form A, 0.5 A @ 24V
Å
(ac) minimum, 264V
Å
(ac)
maximum, optically isolated, without contact suppression
• Output 4: Electromechanical relay. Form A, rated 2 A, 125VA, pi-
lot duty, 120/240V
Å
(ac); 25VA, 24V
Å
(ac)
• Output 2: Electromechanical relay. Form A, rated 5 A, 125VA, pi-
lot duty, 120/240V
Å
(ac); 25VA, 24V
Å
(ac)
• Output 3: Electromechanical relay. Form C, rated 5 A, 125VA, pi-
lot duty, 120/240V
Å
(ac); 25VA, 24V
Å
(ac)
Weight:
• 40 A heat sink assembly only, 431 g (0.95 lb)
• 25 A heat sink assembly only, 340 g (0.75 lb)
• solid-state relay controller only, 177 g (0.39 lb)
• solid-state relay controller only with base without heat sink, 345g
(0.76 lb)
• full system with 25 A heat sink, 1.134 kg (2.5 lb)
Note:
These specifications are subject to change without prior no-
tice .
Specifications
