INSTRUCTIONAL MANUAL
2750L-P/4500L-P/6000L-P
August, 2001
Rev. K
-56-
The following example will program the phase A output to 90 degrees relative to an external sync signal when operating
in the EXT SNC mode:
PHZA 90
The following example will program phase B to 240.5 degrees and phase C to 119.3 degrees leading phase A.
PHZB 240.5 PHZ C 119.3
The PHZA value can be used to control the point of the phase A waveform where the change will occur. The following
example will drop the phase A waveform at 90 degrees for 0.017 seconds before going to 115 volts.
PHZA 90 AMP0 DLY .017 VAL 115
The following example will increase the phase A output voltage to 135 volts for 0.017 seconds starting at the 90 degree
point of the waveform. The voltage will return to 115 volts after the transient.
PHZA 90 AMPA 135 DLY .017 VAL 115
3.7.8
TO PROGRAM CURRENT LIMIT (CRL)
The CRL header with the optional A, B or C extension is used to identify the Current Limit Command. The argument is
a numeric data field from 0.0 to the maximum rated current of the power system.
The following string will program a current limit of 10.5 amps for all three phases:
CRL 10.5
3.7.9
TO PROGRAM CALIBRATION (CAL)
The CAL header when used alone or followed by the header AMP, in addition to an A, B or C extension, is used to
calibrate the programmed output voltage. The argument is a relative starting coefficient from 0 to 255 or the ASCII #
symbol. The CAL ramp is terminated with the GPIB message Group Execute Trigger (GET). The CAL header can be
used with a Delay (DLY) command to allow the external calibration AC DVM time to settle. Refer to Section 4 for
additional information.
A CAL coefficient can be programmed without a ramp by using only the argument with the CAL header.
To program the CAL A coefficient to 55, use the following string:
CALA55
To calibrate phase A at 135 volts, start the CAL routing with a GPIB GET message with the CAL coefficient starting at
20 and with each step lasting 2 seconds, use the following string:
AMP135.0 CALA20 DLY2 STP1 VAL255 TRG
In this example the output will program to 135.0 and start to change the output by stepping the CAL value after a "GET"
message. the ramp will terminate after a second "GET" message.
The following example will calibrate the phase A output by starting the ramp with the existing CAL coefficient and
reducing the output with steps lasting one second:
AMP135.0 CALA# DLY1 STP1 VAL0
Summary of Contents for 2750L-P Series
Page 119: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 115 Figure 6 1 MODULE LOCATION...
Page 138: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 134 Figure 14 EMERGENCY VOLTAGE...
Page 148: ...INSTRUCTIONAL MANUAL 2750L P 4500L P 6000L P August 2001 Rev K 144 FIGURE 2...
