Hubbell Lifting Magnet Controllers 4292 - Manual

Hubbell Industrial Controls, Inc.
Lifting Magnet Controllers
Specification/Price Sheet • August 2008 • Replaces Jan 2008
4292
Type 4292 Compact Controller for Scrap Yards
Description
The Type 4292 Yard-
master
Controllers
incorporated heavy-duty
time proven components
arranged to provide
optimum control of your
lifting magnets.
A mechanically rugged
high thermal capacity
discharge
varistor
assembly is permanently
connected in parallel
with the magnet and
provides a safe dis-
charge path for the
stored magnetic energy.
With Yardmaster mag-
net controllers, induced
voltage cannot return
to the line, permitting
rectified power supplies
to be used without
the added expense of
special protective loads
or bypass circuits.
Application
The Type 4292 Yard-
master Controllers are
suited for many uses
from light scrap handling
to the handling of heavy
billets or plates. It may
be used with all types
and makes of DC lifting
magnets.
Automatic
Discharge
Type
Controllers
The Type 4292 Yardmaster
Automatic Discharge Type
Lifting Magnet Controller
provides a fast and clean
release of mag-net loads
by applying full voltage
reverse current to the
magnet. The full voltage
re-verse current feature
permits the operator to
promptly return for another
lift.
The drop contactor is
under the control of the
operator’s Master Switch
and the dis-charge sensor
module (DSM). When
the operator’s Master
Switch signals the magnet
controller to drop the load,
the “Lift” contactors (L)
open. The stored magnet
energy is dissipated in the
dis-charge varistor. When
the discharge voltage
declines to approximately
300V, the DSM energizes
the drop relay (DR) which
in turn enables the drop
contactor (D) to close
applying full voltage reverse
cur-rent to the magnet and
begin the adjust-able time
reverse current cycle. After
the completion of the timed
reverse cycle the drop
relay and drop contactor
are deenergized.
Features
Automatic Discharge •
Rated 250 VDC @ 5-100 amps •
Front-Wired Front-Removable components •
Mechanically interlocked “Lift” and “Drop” •
NEMA rated mill duty contactors
Permanently connected 700V discharge
•
path completely independent from the
line that protects magnet and generator
High-Thermal capacity varistor discharge
•
path
Peak magnet induced voltage limited to
•
under 700 Volts
Long electrical contact life
•
Minimum Maintenance •
Dribble control - Standard •
Ventilated indoor/outdoor NEMA 3R •
enclosure