STEELFLEX® - Rexnord

Optional Automatic Proximity Sensor Cutout Switch
2 SENSOR TARGETS
AT 180° IN COVER
DRIVEN SHAFT
DRIVING
SHAFT
AIR GAP
2,29- 3,048
25,4
SENSOR
TARGET
CONTROL BOX
T41 HUB
SENSOR
HEAD
JAM NUT
CABLE TO
MOTOR
SENSOR SUPPORT BRACKET
An automatic proximity cutout switch in the motor starter control
circuit of controlled torque coupling or clutch application is
recommended for protection of connected equipment and
coupling or clutch where damaging thermal buildup could
develop. Refer to Slip Torque Performance Charts on Pages 22
through 25 to determine if an automatic proximity sensor cutout
switch is required.
The proximity cutout switch speed control is adjustable at the
control box. It is set at a required cutout speed and continually
compares the actual speed of the driven shaft with the set cutout
speed. The control box can be mounted in an approximate space
of 76,2 millimeters wide by 76,2 millimeters deep by 127,0
millimeters high.
During overload, the coupling or clutch slips at a predetermined
speed. When the driven shaft speed drops below the cutout
switch speed setting, it opens the motor circuit and the drag load
stops the motor shaft.
When the underspeed cutout switch is wired for automatic reset,
the drive is immediately ready for service (after overload is
removed) without resetting the circuit at any point. To restart the
drive, just press either the main or remote control start button.
The motor will not maintain normal operation if the overload has
not been removed because the motor contractor circuit will
reopen as soon as the start button is released.
The customer may incorporate a warning light or an alarm to the
circuit to signal the operator of an overload or shutdown
condition.
Refer to Service Manual 428-440 for complete details.
Overhanging Hubs
When the distance between shaft ends is greater than the
Coupling gap or when the coupling or clutch hub length is
greater than the usable shaft length, overhang one or both hubs.
For Type T41, if this results in less than one shaft diameter of hub
engagement, check key stresses or use a semi-standard long T
hub listed in Table 21, Page 39 or submit application details to
Falk.
CAUTION: The effect of open keyways on coupling or clutch
balance should always be considered.
Dimension Y must be equal to
or greater than dimension X
for clearance fits, or greater
than Dimension X times .75
for interference fits.
X
X
Y
Y
© The Falk Corporation, 2003 (M421-110) 21