Hubbell Euclid Lifting Magnet Controller 4295 - Manual

Hubbell Industrial Controls, Inc.
Euclid™ Lifting Magnet Controllers 4295
Resistor Type Automatic Discharge
Specifications 4295 • March 2004 • Replaces July 1990
Page 1 of 2
Features
ƒ Front-Wired Front-Removable components.
ƒ Mechanically interlocked "LIFT" and "DROP"
contactors.
ƒ Permanently connected discharge path com-
pletely independent from the line.
ƒ High-Thermal capacity resistor discharge path.
ƒ Peak magnet induced voltage limited to under
900 volts.
ƒ Long electrical contact life.
ƒ Minimum Maintenance.
ƒ Dribble feature - Standard.
ƒ Ventilated NEMA 3R Enclosure.
Description
The Euclid Type 4295 Magnet Controllers incorpo-
rate heavy duty time proven components arranged
to provide optimum control of your lifting magnets.
A mechanically rugged high thermal capacity dis-
charge resistor assembly is permanently connected
in parallel with the magnet and provides a safe
discharge path for the stored magnetic energy.
With Euclid magnet controllers, induced volts can-
not return to the line, permitting rectified power
supplies to be used without the added expense of
special protective loads or by-pass circuits.
Automatic Discharge
Type Controllers
The Euclid Type 4295 Automatic Discharge Type
Lifting Magnet Controller provides a fast and clean
release of magnet loads by applying full voltage
reverse current to the magnet. The full voltage
reverse current feature permits the operator to
promptly return for another lift.
The drop contactor is under the control of the op-
erator's Master "Switch" and the discharge sensor
module (DSM). When the operator's Master
"Switch" signals the magnet controller to drop the
load, the "LIFT" contactors (1L+2L) open. The
stored magnet energy is dissipated in the discharge
resistor. When the discharge voltage declines to
approximately 300 volts, the discharge sensor
module (DSM) energizes the drop relay (DR) which
in turn enables the drop contactor (D) to close ap-
plying full voltage reverse current to the magnet and
begin the adjustable time reverse current cycle.
After the completion of the timed reverse cycle the
drop relay (DR) and drop contactor (D) are de-ener-
gized.
Type Controllers
The Euclid Type 4295 Lifting Magnet Controllers
are suited for many uses from light scrap handling
to the handling of heavy billets of plates. It may be
used with all types and makes of dc lifting magnets.
SYMBOL FUNCTION SYMBOL FUNCTION
DR DROP RELAY MOV SURGE SUPRESSOR
P1 POTENTIOMETER RES1 DISCHARGE RESISTOR
CFU CONTROL FUSE RES2 FORCING RESISTOR (IF USED)
RFU DROP FUSES DSM DISCHARGE SENSOR MODULE
D2 DIODE D DROP CONTACTOR
D1
RECTIFIER, MAGNET DISCHARGE
PATH
1L, 2L LIFT CONTACTOR