Marconi LORAIN RHM800E50, Руководство пользователя

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Section 4387
after removal of the lower panel at the front of the
4.10 This rectifier contains a circuit which permits
fier.
selective overvoltage shutdown when two or more recti-
fiers are operated in parallel. The circuit allows opera-
tion of the overvoltage shutdown circuit only in the
which causes the condiiin.
4.11 This is equipped with a ripple regulator
circuit. located on card Al which continuously
monitors the ripple current through the rectifier DC out-
put filter
In the event of a high ripple current
condition caused by the loss of an AC input phase, the
ripple regulator circuit senses the high through
the capacitors and provides a signal to the rectifier
Table Fuse Types and Sizes
which reduces rectifier output voltage and
current. This permits the to continue operating
at a capacity until such as the phase loss
is corrected. External alarms are also refer to
C.
Cards
Paragraph 3.14 for details.
Operation
4.15 Any of the circuit cards listed in Table 4-2 can
easily be replaced as individual assemblies the need
arises.
4.12 If operation off battery is required, a
capacitor assembly, Part No. 425101400, must be
installed on card A7 to rectifier output
Circuit Card Description
voltage. See Figure
Al-A6 (433401600) SCR Firing Circuit
A7 (486508700) Regulator Alarm Card
4.13 The is equipped cooling fans and
temperature sensors mounted on assemblies
at the of the cabinet. The fans circulate
air across the heatsinks to cool power semiconductors
while the temperature sensors monitor
tem-
perature.
air ceases or temperature
reaches output current of the
is reduced to approximately 88% of the full
and an external rectifier fail alarm is activated, if con-
nected. In addition. a cooling fan has failed, a
FAN
FAILURE indicator will illuminate. When the tempera-
ture decreases or fans have been repaired, the rectifier
returns to full load and the external
fail alarm is canceled.
A8 (486562200)
A9 (433852700)
Power Supply Card
Alarm Interface Assy
All (486569800) I Card I
A12. Al3 Fan Failure
A14.15 (425702200)
LED Alarm Card I
Al6 (433800209)
HVSD Circuit
Table 4-2. Replaceable Circuit Cards
5. ADJUSTMENTS
4.14 Table 4-l lists the rating and types for all the
5.1
adjustment potentiometers are
fuses used in the Fuses should be replaced accessible on the control and indicator panel at
the type and size listed, or equivalent. To gain tor and A7 and Ripple Regulator Circuit
access to all fuses except and open the meter All. These potentiometers are factory adjusted and
and control panels. Fuses and are accessible readjustment is not required.
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