KEPCO MBT Series - Manual (Page 56)

3-18
MBTSVC111609
Current mode and the VOLTAGE control will adjust actual voltage limit. This will not be apparent
from the display indication; to see the revised voltage limit it is necessary to view status by
pressing SHIFT then (.) on the keypad.
3.2.1.6.7 VOLTAGE CONTROL — MR, MGR MODELS
As described in PAR. 3.2.1.6.2 (MR, MGR Models) for the Vadj and numeric keys, the effect of
the VOLTAGE control is dependent upon model, commanded mode, output enabled/disabled,
actual mode, and the load.
Table 3-8 (MR, MGR Models) summarizes the effect of the VOLTAGE control adjustments for
different conditions. The first three columns reflect the status of the unit before the VOLTAGE
control is adjusted. The fourth column shows how the adjustment will affect the status of the
power supply. Refer to PAR.s 3.1.1 and 3.1.2 for more details regarding commanded and actual
mode of operation (either voltage or current).
The VOLTAGE control is not operational when the power supply is in Remote mode or when
you enter the MENU (PAR. 3.2.2), PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a
program is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Rotating the VOLTAGE control clockwise increases output voltage/voltage limit; counterclock-
wise decreases output voltage/voltage limit.
Table 3-8 shows that if the output is disabled, with the power supply commanded to be in Volt-
age mode the VOLTAGE control adjusts the programmed output voltage, with the power supply
commanded to be in Current mode the VOLTAGE control adjusts programmed voltage limit.
If the output is enabled and the value of the load is greater than or equal to the value of pro-
grammed voltage divided by programmed current (R
L
≥ V
Prog
/ I
Prog
), the power supply operates
in Voltage mode and the VOLTAGE control adjusts actual output voltage.
TABLE 3-8. USING VOLTAGE CONTROL TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE VOLTAGE CONTROL ADJUSTED
VOLTAGE CONTROL
ADJUSTS: COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
VOLTAGE DISABLED VOLTAGE**** Programmed output voltage
CURRENT DISABLED CURRENT**** Programmed voltage limit
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT *** Actual Voltage limit *
CURRENT ENABLED CURRENT Actual Voltage limit
CURRENT ENABLED VOLTAGE Actual output voltage
* Overload” error message placed in error buffer (for use when operating in Remote mode).
** Actual mode is indicated by the VOLTAGE MODE and CURRENT MODE status LED’s.
*** Condition where load forces power supply mode.
**** Forced internally by the power supply