J&H manufactures H.P.F. Systems for all types of
screening machines: Vibrating Wire, Vibrating Body, Multi-Deck
and Multi-Panel Machines.
PRINCIPALS
Low voltage power is supplied to the screening
media by a J&H heavy-duty transformer mounted in a vented enclosure.
Taps on the transformer permit the output voltage to be adjusted
from 3-12 volts in 6 steps. Up to 1000 amperes of continuous secondary
current may be applied. 1300 amperes may be used for short periods
of time. Located in the transformer enclosure is a 6-position "Power
Selector" switch used to change output voltage. This switch is equipped
with a safety trigger, which must be activated, opening the control
circuit to the power supply, thus reducing high current arcing.
The "Power Selector" can not be changed without depressing this
trigger. A Face mounted indicator shows 'ON-OFF', and an optional
ammeter can be added.
OPERATIONS
The supply current passes through a standard
NEMA size 3 combination starter, equipped with overload protection
and circuit breaker. This starter is remote mounted from the power
transformer and is used for 'ON-OFF' control and safety shut-off
(supply of starter is optional). Output lugs, exiting the J&H
transformer enclosure connect the heavy duty power bus bars, to
the screening machine wire cloth.
INSTALLATION
All NEW heated wire J&H screens are set up at our factory facility
to simulate installed screens. The transformer is located in the position
previously agreed to by J&H and the owner. Bus bars are then custom
fitted between the transformer and feed lugs on your size and type
screening machine. All bus connectors are match-marked for easy assembly.
A NEW screening machine, when ordered with the H.P.F. heating system,
will be shipped assembled with all the internal electrical isolators
in place. Bus bars will be fitted, then shipped for field assembly.
Engineering drawings are supplied for locating transformer and bus
bar assembly to the screening machine
