KEPCO MBT Series - Manual (Page 63)

MBTSVC111609
3-25
The CURRENT 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 CURRENT control clockwise increases output current/current limit; counterclock-
wise decreases output current/current limit.
Table 3-13 shows that with the power supply commanded to be in Voltage mode and the output
disabled, 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 CURRENT control adjusts actual current limit. This will not be apparent
from the display indication; to see the revised current limit it is necessary to view status by
pressing SHIFT then (.) on the keypad.
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
Current mode and the CURRENT control will adjust actual output current.
When conditions dictate that the CURRENT control adjusts current limit, it will not be apparent
from the display indication; to see the revised current limit it is necessary to view status by
pressing SHIFT then (.) on the keypad
3.2.1.7.7 CURRENT CONTROL — MR, MGR MODELS
As described in PAR. 3.2.1.7.1 above for the Iadj and numeric keys, the effect of the CURRENT
control is dependent upon model, commanded mode, output enabled, actual mode, and the
load.
TABLE 3-13. USING CURRENT CONTROL TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE CURENT CONTROL ADJUSTED
CURRENT CONTROL
ADJUSTS: COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
VOLTAGE DISABLED VOLTAGE***** Programmed current limit
VOLTAGE ENABLED VOLTAGE Actual current limit
VOLTAGE ENABLED CURRENT **** Actual output current **
CURRENT * DISABLED VOLTAGE***** Programmed output current
CURRENT * ENABLED CURRENT Actual output current
CURRENT * ENABLED VOLTAGE **** Programmed current limit **
* If the unit was programmed to Current mode remotely before being set to Local Mode, the unit will stay in 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 by the power supply.