KEPCO MBT Series - Manual (Page 61)

MBTSVC111609
3-23
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 3-11 shows that with the power supply commanded to operate in voltage mode, the slew
keys have no effect on current.
If the power supply was operating in a remote configuration, it is possible to use the slew keys to
locally adjust current/current limit only if the power supply was commanded to operate in Cur-
rent mode before being set into Local mode. If the output is disabled, the slew keys adjust pro-
grammed output current. If the output is enabled and the load permits the power supply to
operate in Current mode, the slew keys adjust actual output current; If the load forces the power
supply to operate in Voltage mode, the slew keys adjust actual current limit.
Pressing the key increases the output current/current limit (see Table 3-11) by the slew key
I range value which was previously set using the MENU (see PAR. 3.2.2). For example, if the
current limit is 1.0A (Current mode, output enabled), and the slew key I range value is 0.10A,
pressing the key twice changes the output current to 1.2A. The key operates similarly to
decrease current limit by the slew key I range value.
3.2.1.7.5 SLEW ( AND ) KEYS — MR, MGR MODELS
As described in PAR. 3.2.1.7.2 (MR, MGR Models) for the Iadj and numeric keys, the effect of
the slew keys is dependent upon model, commanded mode, output enabled/disabled, actual
mode, and the load.
Table 3-12 (MR, MGR Models) summarizes the effect of the slew keys for different conditions.
The first three columns reflect the status of the unit before the slew key is pressed. The fourth
column shows how the adjustment will affect the status of the power supply. Refer to PAR.s
TABLE 3-11. USING SLEW KEYS ( AND ) TO SET OUTPUT
CURRENT/CURRENT LIMIT — MODELS M, MG
POWER SUPPLY STATUS BEFORE SLEW KEY ADJUSTED
SLEW KEYS
ADJUST: COMMANDED
MODE
OUTPUT
ENABLED/
DISABLED
ACTUAL MODE **
(DICTATED BY LOAD)
CURRENT * DISABLED VOLTAGE***** Programmed output current
CURRENT * ENABLED CURRENT Actual output current
CURRENT * ENABLED VOLTAGE **** Actual current limit **
VOLTAGE Either DISABLED
or ENABLED Either VOLTAGE
or CURRENT No effect on 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