KEPCO MBT Series - Manual (Page 64)

3-26
MBTSVC111609
Table 3-14 (MR, MGR Models) summarizes the effect of the CURRENT control adjustments for
different conditions. The first three columns reflect the status of the unit before the CURRENT
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 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 3-14 shows that if the output is disabled, with the power supply commanded to be in Cur-
rent mode, the CURRENT control adjusts the programmed output current; with the power sup-
ply commanded to be in Voltage mode, the CURRENT control adjusts programmed current
limit.
With the power supply commanded to be in Current mode, 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 operates in Current mode and the CURRENT control
adjusts actual output current. If the output is enabled and the value of the load is greater than or
equal to the value of programmed voltage divided by programmed current (R
L
≥ V
Prog
/ I
Prog
),
the power supply will be forced to operate in Voltage mode and the CURRENT control will
adjust 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 power supply is commanded to be in Voltage mode with the load enabled and the load
permits the power supply to operate in Voltage mode, the CURRENT control adjusts the actual
current limit (this will not be apparent from the display indication; to see the revised current limit
TABLE 3-14. USING CURRENT CONTROL TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE CURENT CONTROL ADJUSTED
CURRENT CONTROL
ADJUSTS: COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY LOAD)
CURRENT DISABLED CURRENT***** Programmed output current
VOLTAGE DISABLED VOLTAGE***** Programmed current limit
CURRENT ENABLED CURRENT Actual output current
CURRENT ENABLED VOLTAGE **** Actual Current limit **
VOLTAGE ENABLED VOLTAGE Actual Current limit
VOLTAGE ENABLED CURRENT **** Actual output current **
* 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.