KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
081415
228-1678 REV 1
3
10.Turn the Current Control clockwise through its range,
while observing the front panel Ammeter. The BOP out-
put current should respond smoothly, from the maxi-
mum positive output current, through zero, to the
maximum negative output current of the BOP.
11. For BOP 5-20DL only: disconnect voltage applied to
rear panel ON-OFF PORT. Verify that front panel VOLT-
AGE and CURRENT meters show 0V and 0A, respec-
tively, and REMOTE OUTPUT ON-OFF indicator goes
off.
12.Set A-C POWER circuit breaker/switch OFF. Remove
the short circuit from the output terminals. This con-
cludes the preliminary check-out of the BOP.
3.3. INSTALLING THE POWER SUPPLY.
3/4 RACK MODELS.
These models are shipped with four
plastic feet installed for benchtop operation. The feet must
be removed for rack mounting. Kepco’s RA 24 or RA 37
can be used to install these models in a standard 19-inch
rack (installation instructions supplied with rack adapter).
Four plastic mounting inserts on the bottom of the chassis
can be used to mount the unit on any flat surface.
FULL RACK MODELS.
These models are shipped with
fixed angle brackets and chassis slide support bars
installed and are ready for mounting in a 19-inch rack.
3.4. CONNECTIONS.
Connections to the load can be
made using either the front or rear panel terminations, but
not both.
LOAD CONNECTIONS.
Connect the load between OUT-
PUT and COMMON terminals. Connections may be made
at either the front or rear panel.
Sense connections are
required; either local or remote must be used. Other-
wise the unit will not operate.
LOCAL SENSE CONNECTIONS.
For local sensing the
OUTPUT and COMMON terminals are connected to the
adjacent SENSE terminals. The unit is shipped with local
sensing links in place at the rear panel. If load connections
are made at the front panel, remove the installed links from
the rear panel. At the front panel install jumpers between
COMMON and the adjacent SENSE terminal and between
OUTPUT and the adjacent SENSE terminal.
GROUNDING NETWORK.
The unit is shipped with a link
installed between terminals 5 and 6 at the rear panel to
enable the Grounding Network. This network reduces
noise/ripple that may be present at the output.
REMOTE SENSE CONNECTIONS.
Remote sensing (con-
necting the corresponding SENSE terminals to the OUT-
PUT and COMMON terminations at the load instead of at
the BOP) can compensate for load wire losses up to 0.5V
per wire (0.25V per wire on models with rated output less
than 20V). Remote sensing is recommended for minimum
load effect for a remote load. Use twisted pairs: #22 AWG
for output sense lines and wires rated for the nominal out-
put current of the power supply for power leads. See full
Operator Manual (see PAR. 1.1) for remote sensing
requirements.
INPUT A-C CONNECTIONS.
Install the line cord (sup-
plied) at the rear panel and connect to 115V a-c, 60Hz
(105V to 125V a-c, 47 to 63Hz) mains. Refer to the full
Operator Manual (see PAR. 1.1). For operation at 104V a-
c, 208V a-c or 230V a-c refer to the full Operator Manual
(PAR 1.1).
A-C GROUND.
The 3-wire line cord with 3-prong safety
plug (supplied), in combination with a properly grounded a-
c power outlet, automatically grounds the BOP case. If an
adapter for a non-grounded outlet is used, the case must
be grounded separately using a separate GROUND termi-
nal at either the front or rear panel. The ground wire must
be rated for at least the BOP input current (as noted on
nameplate at rear of unit).
D-C SIGNAL GROUND.
Specified ripple and noise figures
for BOP power supplies are valid only with the COMMON
side of the output load circuit returned to a ground point.
The BOP circuits, including output and programming termi-
nals, have no d-c connection to the chassis.
The COMMON terminal of the BOP can be “floated” up to
500 volts (d-c or peak) off chassis ground. The common
mode current (leakage from output to ground) Is less than
50
A (rms) or 5 mA (p-p) at 115V a-c power input, 60 Hz.
To avoid common mode current from affecting the BOP
output, the system (including the programming device, if
used, load, and BOP) must have a single connection to
ground (earth ground). The d-c ground wire must be rated
for the nominal output current of the BOP (e.g, for BOP 20-
10M, use rating of 10A).
Multiple signal grounds in the system may cause “ground-
loop” and instability problems, since noise signals develop
across the impedances between the multiple ground
points. The exact physical location of the “best” single
ground point must be carefully selected for minimum ripple/
noise output and to avoid the possibility of output current
flowing through the return path of an external programming
signal.
