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ELECTRICAL FEATURES
The DA750 unit is built to operate from either 115VAC or 230VAC (not interchangeably),
50/60 Hz., Single phase current. Line current at rated output is approximately 27 amperes
at 115 volts and 14 amperes at 230 volts. Check "Data Nameplate" on the unit for correct
operating voltage.
The DA750 is wired at the factory for either 115VAC or 230VAC operating voltage.
Change over from one voltage to another can not be done in the field. Unit must be
returned to the factory for modification.
An automatic thermal reset/circuitbreaker is provided to prevent overheating and damage
to electrical components.
The current control potentiometer in conjunction with internal electrical circuit, provide
infinitely variable magnetizing and demagnetizing current control.
The power transformer operating in conjunction with an SCR module, transforms the high
voltage line input to low voltage, high amperage A.C. or Half-Wave DC output. While
these components are fan cooled, they are designed for intermittent service at 750
amperes output. To avoid overheating and possible damage, a minumum duty cycle of
50% must be adhered to.
CAUTION:
Attaching less than 30' of 4/O cable (two 15' cables) will cause excessive line
current draw and possible overheating of parts.
CONNECTION
1. With current control in the "Off" position, connect the line cord to the properly fused
and grounded disconnect switch of proper rating. Consult "Data Nameplate" on the back
of the unit for correct operating voltage.
2. Turn the current control so that the unit powers "On". A red pilot light will glow
indicating that there is power to the unit and that it is "On".
3. Plug in and twist clockwise two 15' 4/O magnetizing cables into the output terminals at
the front of the unit.
Note:
One cable must be connected to the "Common" output
terminal. The other cable must be connected to either the A.C. or HWDC cable
connector. Connect the two eitherend connectors or two lug connectors at the opposite
end of the cables to form a "loop". Plug in the control cable and activate to check
operation for both AC and DC output.
For maximum output on either AC or half-wave DC, it is necessary to reduce the inductive
loop of the external cables as much as possible\; that is, the spacing between the
external 4/O cables must be kept at a minimum. If possible, the first ten feet of cable may
be bound of taped together for optimum current output.
NOTE
: When cables are used as a coil with AC current, ammeter readings will be lower
due to coil/part inductance.
Summary of Contents for DA750
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