KEPCO ABC-DM SERIES - Manual (Page 39)

ABC 040104
3-7
The proper way to program the power supply is to initially program the operating parameter to
zero and the complementary limit parameter to the desired maximum value. Subsequent com-
mands should change only the operating parameter. (The operating parameter is the parameter
that controls the output, e.g., voltage controls the output in voltage mode, current in current
mode.) The complementary limit parameter should be programmed only when there is a need to
change it.
3.3.9 SETTING OVERVOLTAGE OR OVERCURRENT PROTECTION
With the power supply in command entry status , press OV SET (overvoltage) or OC SET
(overcurrent) to put the power supply in data entry status . The lower right side of the LCD
shows the programmed setting in effect when the key is pressed. Press ENTER or CLEAR to
exit without changing setting. Enter new value and press ENTER to accept new setting (the
key erases data just entered), or CLEAR to exit without changing setting. To recover from over-
voltage or overcurrent condition, press RESET; this restores the power on defaults (see PAR.
3.3.7).
3.3.10 CHANGING PROTECTION DELAY
The overvoltage and overcurrent protection normally trips immediately upon detection of an
overvoltage/overcurrent condition. However, changing output settings (particularly with reactive
loads) large transients can cause inadvertent tripping of the protection. For this reason, tripping
of the overvoltage/overcurrent protection can be delayed approximately 8 seconds after the out-
put is changed.
With the power supply in command entry status , press MENU until LCD displays
Prot.
Delay Count nn
where nn is the active setting. A count of 0 means no delay, a count of
255 (highest value) means approximately 8 seconds delay (a count of 30 provides a delay of 1
second).
3.3.11 CHANGING MAXIMUM VOLTAGE OR CURRENT VALUE
The maximum values of voltage and current are determined by the model, e.g., 25V and 4A for
the ABC 25-4DM. These values can be lowered by the user, e.g., to prevent inadvertent dam-
age to a specific circuit under test. Changing the maximum values of the ABC 25-4DM to 10V
and 1A, effectively makes the unit a 10V 1A power supply.
With the power supply in command entry status , press MENU key until LCD reads
New MAX-
IMUM Vset
(or
Iset) nn
where nn is the maximum value setting to be changed. Press
ENTER or CLEAR to exit menu without changing setting. Press number keys to enter new
value and press ENTER. Press ENTER again to exit the menu and return to command status .
If a value is entered that is higher than the rated maximum for the power supply, the bottom line
of the LCD flashes
Vset
or
Iset MAX = nn
where nn is the rated maximum of the power sup-
ply. The unit remains in data entry status waiting for a value equal to or less than the rated
maximum. Press CLEAR to exit without changing the value.
Once the maximum value has been changed, if a value higher than the new maximum is
attempted to be programmed, the LCD flashes
Vset
(or
Iset
)
MAX = nn
where nn is the pro-
grammed maximum.
NOTE: If the programmed output value is higher than the new maximum value established
with the MENU key, the output will be limited to the new maximum value.