KEPCO MBT Series - Manual (Page 59)

MBTSVC111609
3-21
Table 3-10 (MR, MGR Models) summarizes the effect of the Iadj and numeric keys for different
conditions. The first three columns reflect the status of the unit before the Iadj command is
issued. The fourth column shows the message on the front panel display after the Iadj key is
pressed and the fifth column shows how the adjustment will affect the status of the power sup-
ply. 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).
Table 3-10 shows that with the power supply output disabled, the Iadj and keypad entries adjust
the programmed output current (Current mode) or current limit (Voltage mode). The Iadj and
keypad entries operate similarly to control actual output current/current limit if the power supply
output is enabled, and the value of the load permits the power supply to operate in the com-
manded mode, Current/Voltage.
If the load is enabled, and the power supply is commanded to operate in Current mode, but
R
L
≥ V
Prog
/ I
Prog
forces the power supply to operate in voltage mode, the keypad entries adjust
the actual current limit, contrary to the display indication.
If the load is enabled, and the power supply is commanded to operate in Voltage mode, but
R
L
< V
Prog
/ I
Prog
forces the power supply to operate in Current mode, the keypad entries adjust
the actual output current, contrary to the display indication.
Refer to PAR. 3.2.1.7.3 for procedure.
TABLE 3-10. USING IADJ AND KEYPAD ENTRIES TO SET
OUTPUT CURRENT/CURRENT LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE Iadj PRESSED EFFECT AFTER Iadj PRESSED
COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE ***
(DICTATED BY
LOAD)
DISPLAY
INDICATION
NUMERIC VALUE
SET BY KEYPAD
ADJUSTS:
CURRENT DISABLED CURRENT***** CONST CURR = Programmed output current
VOLTAGE DISABLED VOLTAGE***** CURR LIMIT = Programmed current limit
CURRENT ENABLED CURRENT CONST CURR = Actual output current
CURRENT ENABLED VOLTAGE **** CONST CURR = Actual current limit **
VOLTAGE ENABLED VOLTAGE CURR LIMIT = Actual current limit
VOLTAGE ENABLED CURRENT **** CURR LIMIT = 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.