KEPCO BOP 1KW-MG Operator Manual, Firmware Ver.2.38 to 2.47 - Manual (Page 82)

3-18
BOP HIPWR 080709
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 negative limits). Use number keys to change
the setting, 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 channel exceeds the limit, it is set to
zero.
3.3.4.2 CHANGING MAXIMUM/MINIMUM PROTECTION SOFTWARE-CONTROLLED LIMITS
The ± protection limits are software limits that establish the maximum and minimum (maximum
negative) allowable levels of output voltage in current mode and current in voltage mode. The
default protection limits are 1% above E
Omax
or 1% above I
Omax
.
The protect channel limits are +V (voltage) Protect max, –V Protect min, +C (current) Protect
Max and –C Protect min (see Table 3-4); these prevent the unit from delivering voltage or cur-
rent that exceed these settings. In voltage mode the current protect channel is clamped to the
limit value; in current mode the voltage protect channel is clamped to the limit value. Adjustment
range is between a minimum (box) value (see Figure 1-3) and 1% above the nominal (rated)
value.
CAUTION: WHEN WORKING WITH ACTIVE LOADS, ALWAYS ADJUST THE BOP PRO-
TECTION LIMITS TO BE ABOVE THE MAXIMUM VALUES OF VOLTAGE OR
CURRENT EXPECTED FROM THE LOAD. FOR EXAMPLE, WHEN THE BOP IS
OPERATING IN VOLTAGE MODE SINKING ENERGY FROM A CONSTANT
CURRENT TYPE LOAD, SET THE CURRENT PROTECTION LIMITS OF THE
BOP ABOVE THE MAXIMUM CURRENT EXPECTED FROM THE LOAD.
1. Press
%
from the power-up screen to enter the General Setup menu, then highlight
Max/Min Settings and press ! to view. (If a Password is required, see PAR. 3.2.4.4 for
instructions.)
2. Highlight the ±CPROTECT or ±VPROTECT max/min value and press
!
to change it. Soft-
ware 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.
3. When complete, press
$
to save for power-up, or
#
to abort, or
%
to apply the changes
(without saving for power-up) and exit.
4. Upon return to the power-up screen, the new protection limit (voltage or current) is com-
pared against the protection 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.
3.3.4.3 EXTERNAL LIMITS
These limits are external analog signals which are converted within the BOP to digital signals
that program the protection channels only: current protect in voltage mode and voltage protect
in current mode. The range of each analog input signal is +1V to +10V, corresponding to a
range for clamping the output between minimum, 10% of nominal (positive and negative), to
+max/–min of nominal rating. Refer to PAR. 3.4.4 for details on implementing external limits.
Table 3-4 explains the effect that these limits have in both voltage and current mode, and refer-
ences the corresponding paragraph for changing the parameter in either local or remote mode.