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Brakes, Clutches and Electronic Components
Electronic Brake Release Indicator (Proving Switch)
Armature-Actuated Brake Series
Indicates when the brake is released by sensing the change in the brake coil current waveform.
For use with the Series 333/350/360 brakes
Brake Operation
When electrical power is applied to the armature-actuated
brake coil, the armature is attracted by the electromagnetic
force generated by the magnet body, which overcomes
spring action. This allows the friction disc to rotate freely.
When electrical power is interrupted, the electromagnetic
force is removed and the pressure spring mechanically
forces the armature plate to clamp the friction disc between
itself and the pressure plate. This develops torque to stop
or hold the load.
Switch Operation
When the brake armature is pulled in to the magnet body to
release the brake, a change in the brake coil current
waveform occurs. By tracking this change in the brake coil
current, the electronic switch indicates when the brake is
released. Mount in remote location (control cabinet) Operating temperature -40°C through 65°C Not susceptible to common problems of
mechanical switches, such as mechanical
fatigue, tolerances, and vibration. Relay contacts are silver-cadmium oxide Utilize either normally-open contacts
(UL rated 2-20A, inductive or resistive,
at 12-240 VAC and CSA rated 10A, inductive
or resistive at 240 VAC) or normally-closed
contacts (UL rated 2-10A, inductive or
resistive, at 12-240 VAC and CSA rated 10A,
inductive or resistive, at 240 VAC)
Features
Ordering Information
Dimensions
Part Number Example:
4 - 4 - 0 7 0 9 0 - X X
DC
Voltage*
Characters
To Insert
24
024
90
090
103
103
180
180
205
205
414
240
414
240
Specify brake model number.
The last 2 digits of the switch
part number will depend upon
the brake size
*
Standard voltages listed. For
other voltages, contact factory.
List Price Discount Symbol
$330.00
R3
NOTE: Cannot be used with half-wave rectifier. Use with full-wave or TOR-AC full-wave rectifier only.
STEARNS ELECTRONIC PROVING SWITCH
INPUT 414 VDC
PART NUMBER
PATENT NUMBER 6,226,167
®
Brakes, Clutches and Electronic Components
P/N 8-178-000-03
effective 6/27/03
48
048
414V Unit
24V thru 240V Units Wiring Instructions
IMPORTANT: Please read these instructions carefully
before installing, operating or servicing your Stearns
switch. Failure to comply with these instructions could
cause injury to personnel and/or damage to property if
the switch is installed or operated incorrectly. For
definition of limited warranty/liability, contact Rexnord
Insustries, Inc., Stearns Division, 5150 S International
Drive, Cudahy, Wisconsin 53110, (414) 272-1100.
CAUTION!
1. Installation and servicing must be made in compliance with
all local safety codes including Occupational Safety and
Health Act (OSHA). All wiring and electrical connections
must comply with the National Electrical Code (NEC) and
local electrical codes in effect.
2. To prevent an electrical hazard, disconnect power source
before working on equipment. If the power disconnect is
out of sight, lock the disconnect in the off position and tag
it to prevent accidental application of power.
3. Make sure voltage rating of the switch corresponds to the
voltage rating shown on the nameplate of the brake.
4. Installation and servicing should be performed only by
qualified personnel familiar with the construction and
operation of this equipment.
Applications
The Stearns electronic proving switch has been designed to
detect and analyze the brake or clutch coil current waveform
signature and thereby determine the operational status of
the power transmission device. This operational status signal
is delivered via a single pole, double throw relay contact. The
status signal can be utilized in a wide variety of control and
warning functions, as described in diagrams A and B.
LOGIC: If, within one second after application of power to the
motor and brake, the proving switch N.C. contact does not
open, the brake has not released, or has not released in an
appropriate manner. The brake wear indicator lamp will
illuminate, alerting the user that brake wear is excessive and
service is required.
LOGIC: If, within one second after application of power to the
motor and brake, the proving switch N.C. contact does not
open, the brake has not released, or has not released in an
appropriate manner. Interrupt relay I is energized and
latched, disabling motor starter M and brake relay B. An
indicator lamp may be wired in parallel with the interrupt relay
coil, indicating Brake not Released. Adjust/repair brake,
depress Reset push-button, depress Start button, system
resumes operation. Control voltage may simply be interrupted
to eliminate Reset function, if desired. Proving switch
contact must be utilized to interrupt both motor starter and
brake relay !!! If only motor starter is interrupted, load may be
free to fall !!!
WARNING!
This switch is designed for use with a full wave
rectifier only, DO NOT USE THIS SWITCH WITH A
HALF WAVE RECTIFIER.
Rexnord Industries, LLC
Stearns Division
5150 S. International Dr.
Cudahy, Wisconsin 53110
(414) 272-1100 Fax: (414) 277-4364 www.rexnord.com
Copyright© 2001-2003 by Rexnord Industries, LLC
A.
B.