B&K Precision 1762 - Manual - Manual (Page 26)

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OPERATING INSTRUCTIONS
9. Observe proper polarity. If the circuit being powered is not equipped with
reverse polarity protection, damage to the circuit can result from reverse
polarity. Use color coded hook-up leads, for convenience in identifying
polarity, red for (+) and black for (-).
10. Make sure that the hook-up leads offer sufficient current capability and
low resistance between the power supply and the circuits being powered.
PARALLEL TRACKING OPERATION
In the parallel tracking mode of operation, both supplies are strapped
together (in parallel). This allows for a 0-30 V supply with a 4 amp current
capability. Only the “A” output terminals are used for parallel tracking
operation. In the parallel tracking mode, the “B” supply output voltage and
current track the “A” supply output voltage and current.
6. Set the power supplies to the TRACKING PARALLEL mode by
engaging both TRACKING switches (INDEP/TRACK and SER/PAR
switches).
7. Set the 0-30V/4-6.5V switch to the 0-30V position, the “A” V/A switch to
the V (voltage metering) position, and the “B” V/A switch to the A
(current metering) position. Output voltage will now be read from the “A”
LED Display. Output current is exactly double the value read from the
“B” LED Display (because each supply is providing the same amount of
current).
8. Because both voltage and current of the “B” supply track the “A” supply,
the maximum current and voltage are set using the “A” controls. Using
the “A” supply output jacks, follow the instructions for “Setting Current
Limit” (INDEPENDENT USE OF “A” OR “B” SUPPLY paragraph of this
section). Remember that the actual current output at the “A” supply
output jacks is double the reading on the “B” LED Display.
1. Adjust the output voltage to the desired level
using the “A” VOLTAGE controls.
2. Turn off the power supply and the equipment to
be powered during hook-up.
3. Connect the positive polarity of the device
being powered to the red (+) terminal of the
“A” power supply.
4. Connect the negative polarity of the device
being powered to the black (-) terminal of the
“A” power supply.
5. Fig. 9 illustrates the grounding possibilities
when used in the TRACKing PARallel mode.
a. If the negative polarity of the equipment or
circuit being powered is also the chassis or
common, it may be grounded to earth by
strapping the black (-) terminal to the green
(
) terminal as shown in Fig. 9A.
b. Similarly, the positive polarity can be
grounded by strapping the red (+) terminal to
the green (
) terminal as shown in Fig. 9B.
c. If an earth ground reference is not required,
the configuration of Fig. 9C may be used.
The scheme in Fig. 9C should also be used
where it is not known whether the chassis is
common with either the positive or negative
polarity.
d. If the chassis or common of the equipment
being powered is separate from both the
positive and negative polarity power inputs,
use the connection shown in Fig. 9D.