This model consists of three-variable but balanced resistances, and three variable reactance loads.
The value of the resistances is controlled by six toggle switches each of which puts 2000 W in parallel with adjoining switches. Each reactance load is controlled by a knob which is rotated counter-clockwise from zero to apply a lagging power factor (inductive) load to the circuit or device. A leading power factor (capacitive) load is applied when the knob is rotated clockwise. Each reactive load has a 1A fuse located above the two pin jacks for that reactance. The resistances and reactances may be used for either single phase or three phase applications. The resistances may be used on D.C. applications.
Caution:
Connect the circuit or device to the resistance and/or reactance terminals before turning on the power to the circuit or device.
1. To adjust the value of the resistance(s), put the tuggle switches in their ON position in numerical order.
2. a. To adjust the value of the resistance(s), place each reactance load in parallel with a resistive load in parallel with a resistive load, whether single-phase (1Æ) or three phase (3Æ) is to be used. Place an ammeter in the reactance leg and an ammeter in the resistive leg.
b. Apply a voltage to the parallel combination of reactance and resistive load. For 3Æ, apply phase A voltage to the phase A parallel combination, etc.
c. Read the value of IR, the in-phase current.
d. Using the desired value of P.F., calculate Ix, the reactive current value.
e. Adjust the reactance adjustment knob until Ix ammeter reads the value of Ix calculated.
f. The value of C or L is then calculated.
3. A diagram illustrating the connections used for a 3Æ configuration is shown below.