Load Sharing Adjustment - Marconi LORAIN RHM800E50 Manual

If remote voltage sensing leads are
extended ( T Option), disconnect and insu-
late. Connect internal voltage sensing leads
( R Option) to terminals 1 (+) and 2 (-) of
TB3.
Install M option capacftor assembly A10 on
circuit card A7.
Connect the test load to the fmskfve output
terminal (+) and either terminal of fuse Fl.
Adjust potentiometer R32 fully clockwise.
Refer to Figure 5-l for location.
Start the m&flier and apply approximately
5% load.
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Connect a digital multimeter capable of
measuring 60 VDC to monitor jacks TP1 and
TP2 and note the float and equalize output
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voltage senings.
Adjust the output voltage by means of poten-
tiometer FLOAT ADJUST to the value at
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which overvoltage shutdown is desired. If
the desired output voftage cannot be
obtained with the float potentiometer alone.
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place the FLOAT/EOUALlZE
the output v&age using the EQUALIZE
ADJUST potentiometer.
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Slowly adjust potentiometer R32 counter-
clockwise until circuit breaker HVSD trips
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open.
As a check. turn the FLOAT and/or the
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Reset HVSD circuit breaker to the ON posi-
the circuit breakertrips at the propervoftage.
Repeat, ff necesssaty, until the proper shut-
down voltage value is attained.
Adjust the FLOAT and EQUALIZE ADJUST
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potentiometers for rectifier output voltage
lower than the shutdown level. Start the rec-
tifier and adjust float and equalffe output
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voltages to the values noted in Step g).
While the rectifier is operating, place the
BATTERY DISCONNECT ffmk into its recep-
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tacle. Immediately place the power switch to
the OFF position.
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Disconnect the test load and multimeter
leads. If the rectffier is normally connected
to a battery, remove the M option capacitor
assembly from circuit card A7.
If remote sensing is normally used at the
battery or load. disconnect the focal sensing
leads fmm TB3 terminals 1 and 2. Connect
these leads to the storage terminals on cir-
cuit card A9.
Connect the remote sensing leads to TB3.
is correct.
Stat-l the rectifier by placing the POWER
P)
switch to the ON position. Close the meter
and control panels, then note the status of
indicators and front panel meters for proper
operation.
5.9 This rectifier is equipped wfth a load sharing cir-
cuit which allows the rectifier to share the load pmpor-
same output voltage, and are equipped wkh negatffe-
bus load sharing circuits. For proper load sharffg. it is
essential that each rectffier be adjusted to the same out-
put voltage. using the following pmcedure:
a) Temporarily open the rectifier load sharing
leads of all paralleled rectffiers and turn off
all but one rectifier.
CAUTION
If the load demand exceeds the mting of a sin-
gle
p l i e d by t h e b a t t e r i e s . c a u s i n g battery
off, insure that the one rectffer still operating
is adjusted to the required output voltage at
100% rated load.
Check the kad sharing voltage across TB3
terminals 2 (-) and 3 (+) to determine lf it is 8
VDC. lf not, adjust potentiometer R28 on
circuit card A7 to obtain 8 VDC. Refer to
Figure 5-l for location.
d)
Start the second rectffier to be adjusted. turn
off the first rectifier. and repeat Steps b) and
Section 4387
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