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HomeProducts Power Switching Watlow Solid State Power Controllers Watlow POWER SERIES™ SCR Power Controller Watlow POWER SERIES™ Solid State Control

Watlow POWER SERIES™ Solid State Control

up to 250 amps
Watlow POWER SERIES™ Solid State Control
Watlow® has manufactured solid state power controllers for over forty years. Watlow’s POWER SERIES™ is a microprocessor-based product that features application flexibility unmatched by any other silicon controlledrectifier (SCR) power controller on the market today. Watlow’s POWER SERIES controllers include single and three-phase models from 65 to 250 amperes. Field configurable phase-angle or zero-cross firing improves application flexibility on site where needed.

50/60Hz independent operation allows utilization almost everywhere in the world without special calibration considerations. Serial communication via Modbus® RTU allows setup and monitoring of loadstatus from a computer station or control room.

On-board semiconductor fusing improves reliability by protecting the SCRs from heater short circuits. Plus, on-board heater bakeout and control diagnostics can help eliminate initial start up problems. All these benefits are in a touch-safe package that can be quickly and easily mounted in a control cabinet.

Watlow’s POWER SERIES controllers are UL® and C-UL® listed, ensuring that they meet world safety and operational standards.


User Manual (EN)
Manuel de l'Utilisateur (FR)
Manual del Usuario (ES)

Watlow: Your Heat Solutions Resource Brochure (EN)
Watlow: Vos Solutions de Chauffage Brochure (FR)
Back to Watlow POWER SERIES™ SCR Power Controller
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Features
Specifications
Ordering information
Resources
Applications

Product Features

200KA Short Circuit Current Rating (SCCR)
  • Minimizes damage in the event of a short circuit
Microprocessor-based technology
  • Extremely versatile and field configurable
Snap-fit on a pre-mounted plate
  • Simplifies installation
Models 65 through 250 amperes rating
  • Handles a wide range of loads
Adjustable soft start
  • Provides application flexibility
Heater and control diagnostics capability
  • Monitors actual heater and controller performance
Electrically touch-safe package
  • Enhances safety for installer and users
Serial communications with Modbus® RTU protocol
  • Provides computer control and/or monitoring
Multizone capability
  • Increases application flexibility and reduces panel space

Product Specifications

Power Bases:
  • Single-phase, (2 SCRs)
  • 3-phase, 2-leg control, (4 SCRs) Resistive load only, zero-cross firing only
  • 3-phase, 3-leg control, (6 SCRs)
  • 3-phase, 3-leg control, (6 SCRs) for 4-wire wye loads
  • Multizone, two and three single-phase zones
Output Control Options:
  • Zero-cross control, fixed time base
  • Time base one or four seconds with digital programmer
  • Zero-cross control, variable time base
  • Phase-angle control and phase-angle control with current limit (not for 3-phase, 2-leg models)
  • Soft start factory default four seconds upon power-up, and adjustable from 0.0 to 120 seconds
  • Soft start upon input signal change, output rate of change adjustable to limit max. rate of change from 0.1 to 100%
  • per 0.1 second. Factory default 10%
  • Current transformer included when required
  • Line voltage compensated (variable time base and phase angle controllers only)
  • Standby or non-operational mode
Output Voltage and Current Rating:
  • 24 to 120VAC (+10%, -15%)
  • 200 to 480VAC (+10%, -15%)
  • 200 to 600VAC (+10%, -15%)
  • 65 through 250A per pole, model dependent; see Output Amperage Chart
  • Min. load 1A rms ac
  • Max. leakage current 5mA
  • 200KA SCCR, Type 2 approved with the recommended fusing; see user manual
Alarms:
  • Single alarm relay
  • Latching or non-latching
  • Separate high and low values
  • Alarm silencing (inhibit) on power up for alarm
  • Alarm indication LEDs, shorted SCR, open heater, fuse
  • Electromechanical relay, Form C contact, software configurable
  • Min. load current 10mA @ 5VDC
  • Rated resistive loads: 3A @ 250VAC or 30VDC max., inductive load rating 1.5A with a power factor ≥ 0.4 without contact suppression
Heater Bakeout:
  • For single-phase (phase to neutral) and 3-phase 6 SCR models only (not for 3-phase, 2-leg models)
  • Soft start with over current trip, runs until programmed bakeout time expires, then goes burst or phase-angle firing.
  • Factory default of 24 hours
  • Adjustable 0 - 9999 minutes with over-current trip
  • Internal current transformer included
Command Signal Input Analog:
  • Input signal: field selectable and scalable, 0 to 20mA or 0 to 10VDC
  • Default input signal: 4 to 20mA
  • Manual control input via digital programmer/display
  • Voltage input impedance 11kΩ nominal
  • Current input impedance 100Ω nominal
Digital:
On-board digital programmer/display and optional serial communications
Retransmit:
  • Field selectable and scalable, 0 to 20mA with 800Ω max. load or 0 to10VDC with 1KΩ min. load
  • Default: 4 to 20mA
  • Resolution: mA ranges = ±5μA
  • VDC ranges = 2.5mV nominal
  • Calibration accuracy: mA ranges = ±20μA
  • VDC ranges = 10mV nominal
  • Temperature stability: 100ppm/°C
Digital Programmer/Display and Communications Capabilities:
  • Programming functions
  • Adjust input and output control type, alarms and soft start, heater bakeout and current limit prompts
  • Monitoring functions
  • Display input and output values along with actual output current
  • Data retention of digital programmer/display upon power failure via nonvolatile memory
Serial Communications:
  • RS-232 for single drop control
  • EIA-485 for single or multidrop control
  • 32 units maximum can be connected. With additional 485 repeater hardware, up to 247 units may be connected
  • Isolated
  • Modbus® RTU protocol
  • 1200, 2400, 4800, 9600, 19200 baud rates
Controller Power Supply:
  • Universal line voltage input range 100 to 240VAC (+10%, -15%) at 55VA max.
  • 50/60Hz ± 5% line frequency independent
  • Controller line voltage for electronic power supply can be run on separate line voltage
Natural Convection and Fan Cooled Models:
  • Cabinet venting may be required
  • See Amperage Chart with Ordering Information for available configurations
Power Dissipation (Watts):
Approximately 1.25 watts/amperes per controlled leg
Isolation:
  • Command signal to load and line/load to ground 2200VAC min.
  • On-board semiconductor fuses provide SCR protection
Mounting:
  • Output Amperage Rating F35: back panel
  • Other Output Amperage Ratings: removable mounting plate
High Current Terminals:
  • Touch safe
  • 3/8 in. (10 mm) Allen head compression terminals will accept 6 AWG to 350 MCM wire. Allen wrench adapter (included) for 3/8 in. (10 mm) socket, 6 point only
  • Torque to 180 in.-lbs (20.3 Nm)
  • Wire strip to 11/8 in. (30 mm)
  • Requires 194°F (90°C) wire insulation rating on line and load terminals
Controller Terminals:
  • Touch safe
  • 1/8 in. (2.5 mm) blade screwdriver, accepts 12-22 AWG or 2 ea. 22-18 AWG wires
  • Torque to 8 in.-lbs (0.9 Nm)
  • Wire strip to 0.24 in. (6 mm)
Operating Environment:
  • 122°F (50°C) base rating
  • 32 to 140°F (0 to 60°C) fan cooled
  • 32 to 149°F (0 to 65°C) natural convection cooled
  • 0 to 90% RH, non-condensing
  • Meets EN50178, Pollution degree three
Storage Temperature:
-40 to 185°F (-40 to 85°C)
Shipping Weight:
  • Output Amperage Rating F35: 38 lbs (17.2 kg)
  • Other Output Amperage Ratings: 23 lbs (10.3 kg)
Agency Approvals:
  • UL® 508 listed, File #E73741, Vol. 3, Sec. 2
  • C-UL® listed to C22.2 NO. 14
  • CE 2004/08/EC (EN61326-1), Class A with filter,
  • CE 2006/95/EC (EN50178)

Ordering information

Resources

Literature

Power Series Datasheet