KEPCO ATE-DMG SERIES - Manual (Page 46)

3-12 ATE-DMG 042314
3.4.8 SETTING OUTPUT VOLTAGE OR CURRENT
V SET and I SET set output voltage and current limit, respectively, when the unit is in constant
voltage (CV) mode and set voltage limit and output current, respectively, when the unit is in con-
stant current (CC) mode. The mode (CV or CC) is determined by the load together with the pro-
grammed settings. As long as the voltage across the load produces a current that is less than or
equal to the I SET value, the unit operates in CV mode (voltage programmed to V SET value,
current limited by I SET value). If the load changes to the point that current through the load
reaches the I SET value, the unit automatically enters CC mode (current programmed to I SET
value, voltage limited by V SET value).
With the power supply in command entry status , press V SET (voltage) or I SET (current) key
to put the power supply in data entry status . The lower right side of the LCD shows the pro-
grammed setting in effect when the key is pressed. Press ENTER or CLEAR to exit without
changing setting. Enter new value (the

key erases data just entered) and press ENTER to
accept new setting or CLEAR to exit without changing setting.
With the power supply in command entry status , an alternative is to use

(increase) or

key (decrease) to change the output by the minimum increment ( 
. 0.025% of E
O
max for volt-
age,

. 0.025% of I
O
max for current). In CC mode, these keys control output current; in CV mode
they control output voltage. The

key has no effect after the maximum (or programmed limit)
has been reached. The

key has no effect when the value is 0.
If the value entered exceeds the maximum setting, the LCD bottom line flashes VsetMAX=nn V
or IsetMAX=n.n A where n.n is the maximum setting (see PAR.3.4.11). The unit returns to
waiting for a value that does not exceed the maximum.
3.4.9 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.
3.4.7).
Table 1-4 lists the maximum settings for overvoltage and overcurrent protection. Overvoltage
and overcurrent settings are recommended to be left set to the factory default values or should
be at least 1% higher than the expected output voltage or output current.
An additional 5% in overvoltage and overcurrent protection above the digitally controlled setting
is provided to allow the user when using external references to utilize the headroom of the basic
ATE power supply. The ATE power supply can provide at least 1% additional voltage or current
as long as the total unit power is not exceeded. Total power varies from 600 watts to 1080 watts
depending on model. (total power = nominal voltage * nominal current)
3.4.10 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