KEPCO KLP SERIES, Operator'S Manual

Page: 43 / 110

KLP073008
3-3
NOTE: During both LOCAL and DIGITAL REMOTE operation, the analog readback signals
(voltage and current) remain available, as does the remote inhibit signal; only program-
ming signals are disregarded.
ANALOG REMOTE: With power supply turned off, ground Analog I/O port pin 12. Refer to PAR.
2.7.9 to configure the Analog I/O Port; refer to Table 2-2 to configure the Analog I/O switch.
When the power supply is turned on, the status display shows
aRem
(Analog Remote program-
ming selected). The unit will accept Analog Remote commands (see PAR. 3.7) and front panel
controls are disabled except that the
POWER ON/OFF circuit breaker is operational. Local
mode can be restored by pressing the VOLTAGE and CURRENT controls at the same time.
Once local mode has been restored, analog remote programming is disabled until the unit is
powered off, then on again. Digital queries are accepted while Analog Remote programming is
active; digital commands are not accepted except for the front panel unlock command (see
PAR. 3.2.2.1).
3.2.2.1 REMOTE WITH LOCAL (FRONT PANEL) LOCKOUT
To prevent unauthorized setting of the power supply to Local mode, a local lockout mode can be
enabled which prevents the power supply from being restored to local mode via the front panel.
With the power supply turned off, set the ANALOG I/O DIP switch, position 5 (see Table 2-2) to
ON. Now when the power supply is turned on the status display will read
aRwl
.(Remote with
Local Lockout).
Once the front panel is locked, it can only be unlocked by either of the following:
• turn the power supply off, set ANALOG I/O DIP switch position 5 to OFF, and then
power up again.
• send the following SCPI command via GPIB or RS232 port:
SYST:KLOC OFF
NOTE: If the front panel is unlocked by SCPI command, the unit will be set to Remote
with Local Lockout when it is turned on again. Set ANALOG I/O DIP switch posi-
tion 5 to OFF to disable Remote with Local Lockout.
3.2.3 ENABLING/DISABLING OUTPUT POWER
When the power supply is turned on, the output is automatically disabled ( DC OUTPUT LED is
off) and the DC VOLTS and DC AMPERES displays show the programmed output voltage and
current set points. If remote analog mode is selected (PAR. 3.7), output is enabled on power up
unless Remote Inhibit, pin 8 of the Analog I/O Connected (see Figure 2-2 and Table 2-6) is
grounded.
To enable the output, first exit SET mode by tapping either the VOLTAGE or CURRENT control,
then press and release the DC OUTPUT switch. The associated green LED lights to indicate
output power is applied to the load. Each time you exit SET mode, the setpoint values are
stored for possible recall if the power supply is turned off (see PAR. 3.2.6.3) or the output is dis-
abled.
To disable the output, press and release the DC OUTPUT switch again. The DC OUTPUT indi-
cator goes off.
While in the setpoint mode (Status display reads
SET
) the output cannot be turned on (pressing
DC OUTPUT has no effect). If output was on while setpoint mode was entered, pressing DC
OUTPUT will disable the output.