Fabco Power
Instruction Manual
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Page 5
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TECHNICAL INFORMATION
These self-excited and self-regulating generators, although overall dimensions have been reduced to a minimum,
are designed for high-level electrical performance and the maximum in operating reliability.
PRELIMINARY CHECKS:
Before touching the machines, perform a thorough and in depth visual
inspection, checking that components are correctly connected up and
that no cables or terminals are broken or loose.
STARTING UP:
Make sure, when starting up, that cooling air intake and discharge openings
are free and unblocked. We also recommend (when the machine operates
in a dusty environment) do periodic checks to make sure it is properly
ventilated
THE IMPORTANCE OF SPEED:
Frequency and voltage depend directly on rotation speed. This must be
kept as constantly as possible on its nominal value no matter what the
load. Drive motor speed control systems generally have a small drop in
speed between no load and loaded conditions. We therefore
recommend setting no load speed 3÷4% above nominal speed.
CHECKING VOLTAGE:
All the machines are regulated during factory testing. If voltage
readings differ from the value indicated on the name plate, this maybe
caused by a mistaken reading or by a different rotation speed and we
recommend regulating motor speed in order to have nominal RPM
under loaded conditions.
CHECKING THE DIODES:
For the ohmmeter test it is best to disconnect the diode from its circuit.
Measure continuity in one direction only. The test can also be made
without disconnecting the diode form the circuit, using a 12V battery
and a 45 watt light bulb (automobile light) as shown in the illustration.
The light should turn totally on only in one direction, as shown below.
WINDING RESISTANCE AT 20° C
ROOM TEMPERATURE
Size
Stator
Ω
Rotor
Ω
Exciter
Ω
3.5
0.7
9.22
5.85
4.0
0.7
9.22
5.85
5.0
0.34
11.89
3.46
6.0
0.34
11.89
3.46
8.0
0.36
3.10
1.43
10.0
0.161
4.03
1.90
