12
228-1692 REV 9
062119
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
www.kepcopower.com
email: [email protected]
in while rotating the knob to modify the least
significant digit.
•
Enter the desired value on the keypad using
the number keys. For example, to program the
BOP to 75.8V, press the following keys in
order
75.8
then press
ENTER
. For fine
adjustment use
Y
, and
U
to modify the least
significant digit. To correct the entry before
activation press the
CLEAR
key to set the
value to zero and start over. When the desired
value is displayed, press
ENTER
. This causes
the new value to appear at the output and be
applied to the load if the output is enabled.
6. To program the corresponding Protect channel,
press
Y
or
U
as necessary to highlight the Pro-
tect channel. Then set the value using either of
the two methods described above. If the Protect
Entry setting is set to Independent, separate
entries for the positive and negative protect chan-
nel are possible. Otherwise the value entered is
applied to both positive and negative protect
channels.
NOTE: The BOP can be configured to show
the protection limits as either a single
value that applies to both protection
channels or show individual settings
for positive and negative protection
limits. Only voltage protection limits
are available when in current mode;
only current limits are available in volt-
age mode. See Operator’s Manual for
details.
SOFTWARE LIMITS.
Software limits prevent pro-
gramming of the main channel or the Protect channel
beyond the software limit value. Refer to Operator’s
Manual for a full explanation of software limits.
Changing Main Channel Software limit.
This procedure allows the user to determine the maxi-
mum value of voltage or current that can be pro-
grammed.
1. Press
%
from the power-up screen to enter the
General Setup menu, then highlight Max/Min Set-
tings.
2. Press
!
to enter the Max/Min Settings submenu
(Figure 6). (If a Password is required, see Opera-
tor’s Manual for instructions.)
3. Highlight the voltage or current max/min value
and press
!
to change it. Software limits are
absolute values (do not use minus sign for nega-
tive limits). Use number keys to change the set-
ting, then
$
to save.
4. When complete, press
$
to save for power-up,
#
to abort, or
%
to apply the changes (without
saving for power-up) and exit.
5. Upon return to the power-up screen, the main
channel (voltage or current) is compared against
the main channel limits in effect. If the main chan-
nel exceeds the limit, it is set to zero.
6. Highlight the ±CPROTECT or ±VPROTECT max/
min value and press
!
to change it. Software
limits are absolute values (do not use minus sign
for negative limits). Use number keys to change
the setting. Press
$
to save, or
%
to abort.
7. When complete, press
$
to save for power-up,
or
#
to abort, or
%
to apply the changes (with-
out saving for power-up) and exit.
Upon return to the power-up screen, the new protection
limit (voltage or current) is compared against the pro-
tection limits in effect. If the new protection limit setting
is below the existing setting for the protection limit, the
protection channel (voltage or current) is set to zero.
DETERMINING HOW THE UNIT RESPONDS
WHEN OUTPUT IS OFF (LOAD TYPE)
The
BOP supports three Load Type selections (see Table 6)
which determine how the power supply responds when
the output is off: ACTIVE, RESISTIVE and BATTERY.
The Load Type selection does not affect the settings of
the power supply for ON state; it only affects the mode
of operation, main internal reference level and the pro-
tection levels during the OFF state.
WARNING
For inductive loads, and especially
superconducting magnet type
loads, the inherent offset of the
BOP in the OFF state may generate
significant current in the circuit. A
properly rated switch in parallel
with a resistor must be connected
between the power supply and the
load. The switch must be open and
the BOP front panel LCD must read
0V, 0A before removing or installing
connections between BOP and
load.
Active.
Active mode (default setting) is necessary for
the power supply to function properly and safely with
inductive loads and constant-current-type active elec-
tronic loads. Active mode can also be used with resis-
tive loads. Table 6 indicates how the power supply
responds to a command to go from Output ON to OFF.
