Pfaff hobbylock 783 - Leakage Current Measurement of Motor Assemblies; Measures in Cases of Incorrect Readings

20 Leakage current measurement of motor assemblies
(time required: 5 minutes)
*
*
*
*
When a motor assembly is changed or parts fitted (field,
armature or capacitor) the leakage current has to be tested
before fitting in the machine.
Set switch at rnA (scale II).
Fit angular plug No. 92-924800-04 and screw on nut No. 92-
320068-05. Connect the two leads as shown in Fig. 67.
Connect two leads to Metratester at right (see Fig. 67).
Reading: 0.75 rnA max.
21 Measures in cases of incorrect readings
Item I Inform owner of house/apartment.
Item II If current input deviates greatly from indicated read-
ing, although there is no mechanical binding in the ma-
chine, motor is defective ahd has to be exchanged or
repaired.
Item III If insulation resistance is lower than indicated read-
ing, defective parts must be located by methodical test-
ing and replaced or repaired.
Item IV Also locate defective parts with excess leakage current
by methodical testing and replace or repair.
Item V Return motor to factory.
Fig. 67
25
Etsy seller: PFANTOM