KEPCO BOP 1000W, Operator'S Manual

Page: 81 / 188

BOP HIPWR 080709
3-17
3.3.4.1 CHANGING MAXIMUM ACCEPTED VOLTAGE OR CURRENT (MAIN CHANNEL SOFT-
WARE LIMITS)
The software limits for the main channels (+Voltage Max, –Voltage Min, +Current Max and –
Current Min) are the maximum (positive) and minimum (Maximum negative) values allowable
for voltage and current. The default software limits are determined by the model: the nominal
(rated) values for voltage and current (e.g., 36V and 28A for the BOP 36-28MG). These four
values can be adjusted independently. For example, a BOP 36-28MG, capable of delivering
±36V in voltage mode can be configured to allow voltage to be adjusted only from –1V to
+15V by setting –Voltage Min to –1 and +Voltage Max to +15. Similarly, a BOP 36-28MG,
capable of delivering ±28A in current mode can be configured to allow current to be adjusted
from –0.5A to +10A by setting –Current Min to –0.5 and +Voltage Max to +10. Adjustment
range is between 0 and E
Onom
for voltage and 0 and I
Onom
for current. Note that these soft-
ware limits are not the same as the Protect Limits described in PAR. 3.3.4.2.
The main channel software limit values can be lowered (closer to zero) by the user, e.g., to pre-
vent inadvertent damage to a specific circuit under test. When the maximum/minimum values
are lowered, the unit will not accept values that exceed the new software limits. If the user
attempts to enter a value that exceeds the software limit, the unit will continue to function. in
local mode the
Exceeding Maximum Allowed Value
message is displayed, and the output
will be clamped to the main channel software limit (maximum/minimum) value. In remote mode
the command is considered invalid and is disregarded: a 120 error is produced and the mes-
sage
Voltage Out of Range
or
Current Out of Range
is displayed on the front panel.
The main channel software limits are always in effect, even when the unit is controlled by an
external reference.
If main channel software limits are changed from the default, the pro-
tection limits must be changed to correspond to the new software limits (see PAR.
3.3.4.2).
As an example, chVoltage Max and –Voltage Min of a BOP 36-28MG to ±3V,
respectively, causes the unit to behave as if it was a BOP 3-28MG. In this case it is important to
change the +V Protect Max and –V Protect Min limits (e.g., to ±3.3V, respectively) so that the
load is protected when operating in Current Mode.
1. Press
%
from the power-up screen to enter the General Setup menu, then highlight
Max/Min Settings.
2. Press
!
to enter the Max/Min Settings submenu (Figure 3-7 and Table 3-5). (If a Password
is required, see PAR. 3.2.4.4 for instructions.)
+V Protect Max (value)
Eomax +1% of Eomax
Defines the maximum value that +Voltage Protect can be set to. To modify refer
to 3.3.4.1.
+V Protect Min (internal value)
Not Adjustable
Defines the minimum value that +Voltage Protect can be set to. This is a calcu-
lated value and is not adjustable from the front panel.
–V Protect Max (internal value)
Not Adjustable
Defines the maximum (minimum negative) value that –Voltage Protect can be
set to. This is a calculated value and is not adjustable from the front panel.
–V Protect Min (value)
Eomax + 1% of Eomax
Defines the minimum (maximum negative) value for –Voltage Protect. To modify
refer to 3.3.4.1.
NOTE: To restore all Max/Min settings defaults, press
%
from the power-up screen, highlight Max/Min settings, press
!
, then
press
@
to restore defaults shown above in BOLD . Press
$
to save for power-up or
%
to apply the changes (without
saving for power-up) and exit.
TABLE 3-5. MAX/MIN SETTINGS MENU (CONTINUED)
SETTING
CHOICES
( BOLD = Factory Default)
FUNCTION