Kenwood PR-657, Instruction Manual

Page: 11 / 20

7. CAUTIONS FOR USE
(4)Connecting Two or More Onits of PR-657 in Series
To use t w o units of PR-657, connect a load as illustrated
below. The sum of two output voltages is applied across
the load.
1. Do not use your PR-657 set in direct sunlight since
this will cause the internal temperature to rise, result-
ing in unstable operation and damaging of the internal
components.
2. Avoid use at high temperatures and hight humidity.
3. Do not use in locations where server vibrations are
produced or near places where strong magnetic fields
or shock voltage are generated. Otherwise the transis-
tors will be adversely affected.
4. When using your PR-657 set with other equipment
which is easily affected by power line fluctuations,
such as an oscilloscope, the other equipment will be
adversely affected if the power supply set is placed
close to it or atop it. Therefore, place the power
supply set as far away from the other equipment as
possible.
5. For connection of load, firmly tighten each connec-
tor. The load leads should be wired as short as
possible. Poor connection and high wiring resistance
result in unstable output voltages.
6. Do not put any matter close to the ventilation
openings on both sides and rear panel as the con-
trolled transistors are forcibly cooled
by fan.
7. Replacing the fuse
a. Open the fuse holder using a Phillips screw driver.
b. Replace the fuse.
C A U T I O N : Be sure to select the fuse of rated capaci-
t y . For a 100 and 120 V AC lines, use a
5 A fuse; a 220 and 240 V AC lines, a
3 A fuse.
E
0
= E
1
+ e
2
Figure 7
CAUTIONS
1. The protective diodes used should have higher than
7.5 A average forward current and higher than 50 V
inverse peak voltage.
2. In needing the positive ploarity at the load, connect
short bar at the position (a). For negative polarity,
place it at the position (b).
11
PR-657
PR-657
P R O T E C T I V E D I O D E S '
L O A D