KEPCO MBT Series - Manual (Page 54)

3-16
MBTSVC111609
The slew keys are not operational when the power supply is in Remote mode, when you enter
the MENU (PAR. 3.2.2), or PROGRAM REV/CHG (PAR. 3.2.1.11.1) functions, or when a pro-
gram is running (PAR.s 3.2.1.11.3 and 3.2.1.11.5).
Table 3-6 shows that with the power supply commanded to operate in Voltage mode, with the
output disabled, the slew keys adjust 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 slew keys adjust 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
Current mode and the slew keys 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.
If the power supply was operating in a remote configuration, and the slew keys will be used to
locally adjust voltage/voltage limit, it is advisable to press SHIFT and Vadj to ensure that the
power supply has been commanded to operate in Voltage mode. If the power supply was com-
manded to operate in current mode before being set into Local mode, the slew keys will have no
effect on output voltage or voltage limit.
Pressing the key increases the output voltage/voltage limit (see Table 3-6) by the slew key V
range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the out-
put voltage is 25.6V (Voltage mode, output enabled), and the slew key V range value is 0.10V,
pressing the key twice changes the output voltage to 25.8V. The key operates similarly to
decrease output voltage by the slew key V range value.
TABLE 3-6. USING SLEW KEYS ( AND ) TO SET OUTPUT
VOLTAGE/VOLTAGE LIMIT — MODELS MR, MGR
POWER SUPPLY STATUS BEFORE SLEW KEY PRESSED
SLEW KEYS
ADJUST: COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
VOLTAGE DISABLED VOLTAGE**** Programmed output voltage
CURRENT Either DISABLED
or ENABLED Either CURRENT or VOLT-
AGE No effect on voltage. (Refer to table
3-11 for effect on current/current
limit.)
VOLTAGE ENABLED VOLTAGE Actual output voltage
VOLTAGE ENABLED CURRENT*** Actual voltage limit *
* “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 power supply.