KEPCO MBT Series - Manual (Page 55)

MBTSVC111609
3-17
3.2.1.6.6 VOLTAGE CONTROL — M, MG MODELS
As described in PAR. 3.2.1.6.1 (M, MG 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 3-7 (M, MG Models) summarizes the effect of the VOLTAGE control adjustments for dif-
ferent conditions. The first three columns reflect the status of the unit before the VOLTAGE con-
trol 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 3-7 shows that with the power supply commanded to be in Voltage mode and the load dis-
abled, the VOLTAGE control adjusts the programmed output voltage.
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.
If the output is enabled and the value of the load is less than the value of programmed voltage
divided by programmed current (R
L
< V
Prog
/ I
Prog
), the power supply will be forced to operate in
TABLE 3-7. USING VOLTAGE CONTROL TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS M, MG
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
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT**** Actual voltage limit **
CURRENT * DISABLED Either VOLTAGE
or CURRENT Programmed voltage limit
CURRENT * ENABLED CURRENT Actual voltage limit
CURRENT * ENABLED VOLTAGE Actual output voltage
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in com-
manded current mode until a Voltage Mode command is received.
** 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.