KEPCO BHK-MG Series, Руководство оператора

Страница: 52 / 150

3-6
BHK-1/2-MG 030916
The BHK-MG incorporates a “keypad lockout” command which allows the LOCAL key to be dis-
abled during remote operation, preventing inadvertent setting of the power supply to Local
mode. When the keypad is locked, the LCD displays
RwL
in place of
LOC
. If the keypad is
locked, it must be unlocked either by a remote command (see Appendix B, PAR. B.82), or
cycling the power supply off then on.
3.2.5 ADJUSTING LCD CONTRAST
With the power supply in command entry status
(:_:_:)
, press MENU key until LCD displays
CONTRAST
. Press or key to increase or decrease contrast for optimum viewing. The con-
trast can also be set directly by entering a number from 0 to 9 . Press ENTER or CLEAR to exit
menu.
3.2.6 ENABLING/DISABLING AUDIBLE BEEPS
With the power supply in command entry status
(:_:_:)
, press MENU until LCD displays
SPEAKER
. The top line indicates if the speaker is on or off (the factory default setting is speaker
on). Enter 1 to enable the speaker, or 0 to disable the speaker. Press ENTER or CLEAR to exit
menu. Audible beeps associated with safety or failure messages are always enabled and can
not be disabled.
3.2.7 ENABLING/DISABLING DC OUTPUT POWER
When the power supply is turned on, the output is automatically disabled or enabled depending
on
OUT on
or
off @Pwr-Up
(see PAR. 3.2.7.4), and the bottom line of the LCD gives voltage
and current measurements at the output.
3.2.7.1 DISABLING DC OUTPUT
To disable the output, press the red OUTPUT ON/OFF key; the top line of the LCD reads:
OFF
and the bottom line displays output voltage and current (zero). When the output is disabled, volt-
age and current references are disabled; the power supply remains in Command Entry status.
Pressing the
OUTPUT ON/OFF key again enables the output: the previously programmed val-
ues of voltage and current are restored and the LCD displays the mode (CV or CC) and actual
values of output voltage and current.
NOTE: After disabling the output by pressing the OUTPUT ON/OFF key, if the analog input is
causing more than 8Vd-c to appear at the output terminals, or if current exceeds two
LSBs, the unit will beep and enter a controlled shutdown for safety purposes. The bot-
tom line will flash a message showing the time remaining before shutdown (e.g
POWER
OFF 9 SEC
). After the 10 second countdown the front panel circuit breaker will trip. (If
the unit does not shut down due to a defective protection circuit or faulty circuit breaker,
the LCD displays
**BHK** **FAILURE **
and beeps constantly.) This feature is not
available if the output is disabled via the Status and Remote On/Off Port.
3.2.7.2 DISABLING DC OUTPUT USING REMOTE ON/OFF PORT
The output can also be Enabled and Disabled by using the inputs available at the Status and
Remote On/Off port at the rear panel. Output on/off control can be obtained using either a nor-
mally-open relay contact, a normally-closed relay contact, or a TTL type signal. Controlling the
output through the Status and Remote On/Off Port is similar to using the
OUTPUT ON/OFF key
or the SCPI OUTPut ON and OUTPut OFF commands. Refer to Table 1-2 for characteristics of
Status and Remote On/Off Port signals and to Table 2-3 for pin assignments and functional
description.