3
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.
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