MODELS 620, 630, & 640 LIQUID-COOLED BRAKES

Liquid cooled adjustable torque brakes consist of a rotating member (rotor), keyed to a straight-through double extension shaft, a stationary brake coil and an automatic water piping flow-through cooling system. The brake imposes controlled deceleration at variable speeds. There is no physical contact between rotating and stationary members. This results in smooth response, thereby eliminating shock loading and extending equipment life.

The brakes are equipped with a tachometer generator mounted internally to provide a feedback signal to the brake's controller. The controller provides the DC excitation for the brake coil. The feedback signal from the tachometer generator is compared against a reference signal within the controller to provide accurate, smooth, controlled braking or constant speed throughout the period of excitation. Constant torque can be obtained with highly accurate torque adjustments.

SPECIFICATIONS
Brake
HP and RPM
See Catalog Standard Ratings Table
Class B insulation
Standard
Stationary coil
Standard
Coil voltages
45 VDC standard
AC tachometer generator
Standard
Two-year warranty
Standard
Cooling
100% automatic water cooled
Controller
Model Mark III Solid State Controller
Standard (priced separately)
Sizes required, for 45 VDC coil:
WC-620, 630
MK III, size 1
WC-640
MK III, size 2
Two-year warranty
Standard
Closed loop speed control
Optional
Speed regulation
0.5% standard; 0.1% optional
Input power
Line transformer standard
Enclosure NEMA 1
Standard
Enclosure NEMA 12
Optional
Two-year warranty
Standard
Panel mount, open construction
Optional
Input power required
2% maximum standard
Output voltage, current to brake coil
As specified
Adjustments
Run/jog roto-pushbuttons, stop pushbutton and current, minimum speed, maximum speed, linear acceleration, damping, time constant adjustment, current feedback
Optional
Controller Protective Features
Input fuses, low line voltage, line transients, isolated signal circuits, output overcurrent
Standard
Operator's Control
Attended start (3-wire control)
Standard
Control circuit voltages
115 VAC standard on Mark III
Speed setting: Potentiometer circuit
0-9 VDC standard
Speed setting: Instrument signal input
Optional
Status Indication
Speed indicating signal
0-60 VAC from tachometer generator for optional meter
Environmental Ratings
Operating temperature
0° to 40° C(32° to 104° F) standard
Altitude
1000 m (3300 ft.) standard
Codes and Standards
Mechanical NEMA, as applicable
Standard
Mechanical CSA
Approved
Controllers CSA
Approved
Controllers UL
Approved Mark III controllers and model 3000 (45 VDC)
Reliability Testing - Mechanical
100% dynamometer tested
Standard
Reliability Testing - Controllers
Pretested components
Standard
Printed circuit thermal stress cycle
Standard
Computer test and precalibrated PCB's
Standard
FEATURES
BENEFITS
AC power input - adjustable torque brakes and controllers are available to run on virtually any three phase voltage input.
Compatible with existing wiring and plant power.
Single controller - Model Mark III controller used for 40 through 100 HP.
Minimum spare parts expense.
Simple design - brake consists of a rotor and shaft, stationary brake coil, automatic water piping system, and a solid state controller.
Easy to understand, install, operate, and maintain.
Fewer wearing parts - all adjustable torque brakes have only two bearings.
Minimum down-time and maximum production from initial start-up.
Completely enclosed, liquid cooled.
Provides a consistent, high quality product under changing load and environmental conditions.
Low control power.
Full control of maximum load is accomplished with low excitation power.
Flexible use.
Couple brake shaft directly or with belts.
Greaseable ball bearings.
With a regular maintenance program, extended bearing life can be expected.
High cooling efficiency.
Results in high horsepower capacities from small physical size brakes.
Two-year warranty on mechanical brakes and electronic controllers.
Brakes are built to give long reliable, low cost life in diverse applications.