P O W E R S E R I E S C O N T R O L L E R S
Microprocessor-Based
SCR Power Controller
Designed for
Application Flexibility
Watlow has manufactured solid state power controllers for
over thirty years. Watlow’s POWER SERIES represents the
latest in SCR power controller technology. This microproces-
sor-based product offers features and application flexibility
Features and Benefits
Microprocessor-based technology
• Extremely versatile and field configurable
unmatched by any other SCR power controller on the market
today.
Snap-fit on a pre-mounted plate
• Simplifies installation
Capabilities of Watlow’s POWER SERIES controllers include
single-phase and three-phase models from 65 to 250 amps.
Field configurable phase angle or zero cross firing improves
application flexibility on site where you need it.The 50/60Hz
independent operation allows utilization almost everywhere
in the world without special calibration considerations. Serial
communication utilizing Modbus™ protocol provides remote
control setup and monitoring of load status from a nearby
computer station or control room.
Models 65 through 250 amp ratings
• 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
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 your control cabinet.
™
Serial communications with Modbus RTU protocol
• Provides computer control and/or monitoring
Multizone capability
• Increases application flexibility and reduces panel space
Watlow’s POWER SERIES controllers are UL® and C-UL®
recognized, so users can be assured that the controllers
meet world safety and operational standards.
UL® and C-UL® are registered trademarks of the Underwriter’s Laboratories, Inc.
Modbus™ is a trademark of Schneider Automation Inc.
WIN-PS-0403
1241 Bundy Boulevard
Winona, Minnesota 55987-5580 USA
Phone: 507-454-5300
Fax: 507-452-4507
e-mail: [email protected]
© 2003 Watlow Electric Manufacturing Company
Printed in the USA on Recycled Paper, 15% Postconsumer Waste
Package Style C Dimensions
Mounting Plate Dimensions
POWER SERIES Front View
Release Tab
Mounting Holes (4)
7 mm
(0.27 in.)
354 mm
(14.0 in.)
178 mm
(7.00 in.)
Key Slots
POWER SERIES Top View
39 mm
(1.53 in.)
25 mm
(0.97 in.)
102 mm
(4.00 in.)
151 mm
(5.93 in.)
200 mm
(7.9 in.)
191 mm
(7.5 in.)
POWER SERIES Features
Single Phase Configuration
This configuration can be purchased with any or all the
features available on the POWER SERIES, based on
customer preference. It is intended for resistive heaters,
but can also be used on transformer connected loads in
the phase angle firing mode.
Three-Phase, Two Leg Configuration
This configuration is intended for zero cross firing only into
a stable resistive heater. Typically, a three-phase delta or
ungrounded wye connected heater is used and only two of
the three V~ line phases are switched.The third phase
is a direct connection through a bussbar on board the
POWER SERIES. Heater current monitoring and kVA options
are available via the heater diagnostics option.
Three-Phase, Three Leg Configuration
All POWER SERIES options are available with this
configuration. It works well with phase angle firing into a
three-phase, three-wire wye or delta connected heater. In this
configuration, the more common applications are transformer
connected loads with heaters requiring a soft start and/or
current limiting.
The three-phase, four-wire configuration is intended for zero
cross firing into a three-phase grounded wye/star heater (This
is a separate hardware option, model number dependent.)
Single-Phase, Multizone Configuration
This configuration is available in two and three single-phase
zones and all the features of a single-phase unit are
available. (Note that there is only one alarm relay and all
zones in the controller must use the same control method.)
Heater Diagnostics
Heater diagnostics may include some or all of the
features that require heater current monitoring, depending
on the model selected. Heater current monitoring is only
available with heater diagnostics installed on the controller.
The features dependent on heater current monitoring are
heater bakeout, current limiting, heater kVA monitoring,
retransmit and heater monitoring alarms such as open heater,
heater out of tolerance, load balance and shorted SCR
detection/error. Heater diagnostics must also be installed
if you need phase angle control with current limit.
Amperage Chart—50˚C (122˚F)
Non-Fan Cooled
2 Zone and
3 Zone and
Single Phase
3 Phase, 2 Leg
3 Phase, 3 Leg
Code Amperage Code Amperage Code Amperage
Fan Cooled
Single Phase
3 Phase, 2 Leg
3 Phase, 3 Leg
Code Amperage Code Amperage Code Amperage
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