KEPCO KLP 10-150-2, Руководство пользователя

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3-34
KLP070312
FIGURE 3-14. VIRTUAL MODEL DIALOG BOX
3.4 REMOTE PROGRAMMING USING ANALOG SIGNALS
The voltage and current inputs (Vref and Cref, respectively) of the Analog I/O Port (see J2, Fig-
ure 2-2 and Table 2-2) are normally inactive. These are activated by connecting pin 12 of J2 to
one of the four GND pins: J2 pin 9, 11, 13 or 15 before turning the power supply on. Once the
power supply is turned on the status display reads
aRem
. While the power supply is in analog
remote mode, digital queries related to status and readback will be accepted and executed. The
following paragraphs provide detailed information for using analog programming signals.
Analog programming inputs are updated once every 0.5 seconds (2 Hz). Since Vref and Cref
are converted to digital form, then processed by the digital processing circuitry of KLP identical
to any other programming input, optimum (12-bit) resolution is achieved when 10V program-
ming input is equivalent to full scale. I
t is important to note that the full scale programming
input levels of Vref and Cref correspond to the present virtual model setting of the power
supply.
Thus, if KLP 75-33 is programmed as a virtual model 50V and 20A, applying the full
scale programming input to Vref and Cref will program the output for 50V and 20A, respectively.
One benefit of this feature is the preservation of full 12-bit programming resolution for virtual
model settings that are less than the model maximum ratings (Vmax and Imax) as long as 10V
analog input is equivalent to full scale. Decreasing the analog voltage equivalent to full scale to
something less than 10V (see PAR. 4.3.3) will cause a corresponding decrease in programming
resolution.
NOTE: The full scale programming voltage has a 1:1 correspondence with the external read-
back; i.e., 10V full scale programming voltage results in a 10V full scale readback. If
the full scale programming voltage is changed to a value other than 10V, the full scale
readback voltage is changed accordingly.
With the exception of Vref and Cref, all the other Analog I/O Port functions are active regardless
of the status of the analog control signal applied to J2 pin 12. These include internal relay:
RELAY_NO (pin 2), RELAY_COM (pin 4), RELAY_NC (pin 10); voltage and current readbacks:
VOLT_RBACK (pin 6) and CURR_RBACK (pin 7); external trigger: EXT_TRG (pin 14) and
remote inhibit: REM_INH (pin 8).
3.4.1 ENABLING/DISABLING THE OUTPUT USING ANALOG CONTROL
If the output has previously been enabled, the Remote Inhibit (
rINH
) signal applied to analog
I/O port pin 8 (see PAR. 2.7.9) allows the output to be enabled/disabled remotely. If the output is
already off, this signal has no effect; however if it is active, and an attempt is made to turn the
output on, the output will stay off and
rINH
will appear in the status display.
This signal is a TTL signal that can be programmed to be active (turn the output off) for either a
TTL high (logic 1) or TTL low (logic 0) (see PAR. 3.2.16.3.1).