MTB Baumalight QC Series, Руководство оператора

Страница: 26 / 32

6.2.5 Maintaining The
Permanent Magnets
If the generator is not used for a long time, it is
possible that the permanent magnets that provide
the magnetic field for excitation of the field coil will
lose their magnetism and the generator will not be
able to produce electrical power.
To keep the magnets in good working order, you
must run the generator under load for at least an
hour once every six months.
See Restoring Residual Magnetism in this section,
if your generator loses magnetism.
6.2.6 Restoring Residual
Magnetism
NOTICE
Risk of generator damage. Only attempt
this procedure if you are trained to do
so. If in doubt, contact your Baumalight
representative.
Note: You will need a 120 volt, two prong power
cord with flag terminals crimped on the ends to
perform this procedure.
Place 120 VAC for about 2 to 3 seconds across
SE350 power input terminals #3 & #4 while the
unit was at rest. The basis for this procedure is:
1. The SE350 AVR requires approximately
240 VAC for both input power and sensing
across input terminals #3 and #4. With 240
VAC input, maximum forcing voltage is 105
VDC. Maximum forcing current - for 1 minute
is 5 amperes. Maximum continuous running
current rating of this regulator is 3.5 amperes.
2. MAGNAPLUS exciter fields have a nominal
resistance of 24.5 ohms. With 120 volts AC
(½ rated voltage) imposed on the AVR power
and sensing input, the AVR will go to full
conduction of its power rectifier (SCR). With
only 120 volts input power, the AVR will only
force at half of 105 VDC or 52.5 VDC.
3. With 52.5 VDC imposed upon a 24.5 ohm
field, maximum excitation current will be in the
area of 2.1 to 2.2 amperes, which is 4.5 times
the exciting current imposed on the field with a
12 VDC flashing source. 2.2 amperes is much
lower than the SE350’s rated continuous
current of 3.5 amperes, thus this procedure
will not pose a threat to the regulator so long
as the exciter field resistance is 15 Ohms or
higher.
24