Alpha Technologies Spectra Series - Manual (Page 50)

Preliminary Operating Instructions 50 of 62 AIP SERVICE NUMBER 1-800-863-3364
15.3 TRANSFORMER TESTING
If the transformer is suspected of being faulty, a voltage check of the transformer should be made. The
battery should be disconnected and capacitors in the charger de-energized. With the A1 SCR Driver
board cables disconnected and the secondary wires that go to the SCRs disconnected, the voltages can
be measured. Connect the charger to the nominal AC voltage source of the charger. The voltages on
the transformers should be close to those found in FIGURE 15.3. Use a True RMS meter when taking
the AC voltage measurements.
FIGURE 15.3: TRANSFORMER AC VOLTAGES TABLE
Charger Type
AC Input
Voltage
Secondary
AC Voltage
measured
Wires 5-7 AC
Voltage
measured
24 VDC 6A 120 or 240 64 27
24 VDC 6A 208 64 27
24 VDC 12A 120 or 240 67 27
24 VDC 12A 208 67 27
24 VDC 18A 120 or 240 66 27
24 VDC 18A 208 66 27
24 VDC 20A 120 or 240 66 27
24 VDC 20A 208 66 27
24 VDC 25A 120 or 240 64 26
24 VDC 25A 208 64 26
24 VDC 50A 120 or 240 56 27
24 VDC 50A 208 56 27
48 VDC 6A 120 or 240 131 27
48 VDC 6A 208 131 27
48 VDC 12A 120 or 240 129 27
48 VDC 12A 208 129 27
48 VDC 18A 120 or 240 119 27
48 VDC 18A 208 119 27
48 VDC 20A 120 or 240 119 27
48 VDC 20A 208 119 27
48 VDC 25A 120 or 240 118 28
48 VDC 25A 208 118 28
48 VDC 50A 120 or 240 107 26
48 VDC 50A 208 107 26
130 VDC 6A 120 or 240 317 28
130 VDC 6A 208 317 28
130 VDC 12A 120 or 240 312 27
130 VDC 12A 208 271 27
130 VDC 18A 120 or 240 271 27
130 VDC 18A 208 270 27
130 VDC 20A 120 or 240 271 27
130 VDC 20A 208 270 27
130 VDC 25A 120 or 240 311 27
130 VDC 25A 208 252 29
130 VDC 50A 240 277 28
130 VDC 50A 208 277 28
NOTE: The measured values should be less than 4 volts
higher or lower than the values listed.