KEPCO KLP Series (older -1200 models) Operator Manual - Manual (Page 54)

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KLP073008
Each location defines values for the active channel (either output voltage or output current), a
dwell time duration (between 0.010 and 655.36 seconds) for the programmed settings, and the
state of the internal relay. By programming the output to change in small increments, complex
outputs can be generated. Figure B-2 illustrates the use of the LIST commands to output a user-
generated sequence from the KLP.
NOTES: 1. When programming sequential voltage levels, it is important to set the Overvoltage
to accommodate the highest voltage of the sequence. Otherwise, when going from
higher to lower voltage levels, the overvoltage protection will trip and shut down the
unit because the overvoltage setting registers faster than the power supply can
attain the lower voltage.
2. To operate the internal relay using the LIST commands, first configure the internal
relay to LIST (see PAR. 3.2.11.3), then use the LIST:CONtrol command (see
PAR. B.10) to control the relay.
3.3.1.3 EXTERNAL TRIGGERING
If external trigger mode is selected, grounding the EXT_TRG line (J2 pin 14 to pin 9, 11, 13 or
15) creates the trigger event at which time the trigger values (preset values VOLT:TRIG and
CURR:TRIG) will become the setpoint values (Vset and Cset) for the power supply. Refer to
PARs. A.15, B.43, B.55, and B.93. The VOLT:TRIG and CURR:TRIG values are reset to the
default minimum (zero V or minimum A) when the unit is calibrated
If a virtual model setting (maximum voltage or current, see PAR. 3.2.5) is changed, and a trigger
level is outside the range established by the new virtual model, the following occurs: when the
unit is triggered, the VOLT:TRIG or CURR:TRIG value is reset to the default minimum and an
error message notes that the requested value is out of range.
3.3.1.4 INTERNAL RELAY CONFIGURATION
The internal relay contacts available at pins 6, 7 and 8 of the Analog I/O connector can be con-
figured from the front panel to operate in either Fault, Manual or List mode (see PAR. 3.2.11.3
for details). If FAULT mode (the factory default) is selected, the relay energizes automatically
upon detection of a condition: defined as either a) NORM (normal), a (fatal) system fault, b) V-
>C, when the unit transitions from Constant Voltage (CV) to Constant Current (CC) mode, or c)
C->V, when the unit transitions from CC to CV mode. If V->C (or C->V) is selected, the amount
of time the unit must be in CC (or CV) mode before the relay energizes may be programmed
using the SCPI command OUTP:PROT:DEL (see PAR. B.33).
3.4 RS232-C OPERATION
The KLP Power Supply may be operated via an RS232-C terminal, or from a PC using a termi-
nal emulation program. The KLP is considered data terminal equipment (DTE), as are most con-
trollers and computers. Communications between KLP, considered data terminal equipment
(DTE), and data communications equipment (DCE), e.g. a modem, requires a patch cable, or
one with a pin-for-pin relationship between terminating connectors. A null modem cable is nec-
essary for nearly all applications, with the exception of those in which the RXD and TXD line
transposition is accomplished via external hardware (e.g. older Apple MAC computers with D-
sub serial port).
Baud rate may be changed from the front panel (see PAR. 3.2.9). All RS 232 parameters may
be changed using SCPI commands (see Appendix B) as follows: for baud rate, refer to PAR’s
B.68 and B.69; for prompt, refer to PAR’s B.76 and B.77; refer to PAR’s B.68 and B.69; for
echo, refer to PAR’s B.70 and B.71; for XON/XOFF, refer to PAR’s B.72 and B.73. The default
settings are as follows: