KEPCO BOP-GL 1KW Operator Manual Firmware Ver.3.05 and higher - Manual (Page 78)

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BOP-1K-GL 022814
and rises to +10V causes the output to rise from zero and reach +18V when the exter-
nal reference reaches +5V. The output stays at +18V while the reference increases
from +5V to +10V since the system voltage limits for this example are ±18V.
The command sequence that can be used is:
FUNC:MODE VOLT Sets unit to voltage mode.
VOLT:LIM 18 Sets main channel (voltage) software limits to ±18V.
CURR:PROT 20 Sets protection level to ±20A.
To restore all the above settings for power up, send *SAV3. This saves the settings to memory
location 3 (locations 1 through 15 can be used to establish initial power-up conditions). Set
power-up switch S3 to 00011 when performing a normal power-up (PAR. 3.3.2.2) to restore the
saved settings upon power up: main channel set to voltage, voltage limits set to ±18V and cur-
rent protection set to ±18A.
The voltage limit setting can also be saved by sending MEM:UPD LIM (see PAR B.12) and tag-
ging the unit with the new power-up settings. The factory default limits can be restored by per-
forming a reset power-up (PAR. 3.3.2.1) which overrides the limits previously set by MEM:UPD
LIM.
NOTE: If the system limits have been modified (PAR. 3.3.5), the output of the power supply will
never exceed the modified system limits.
3.4.1.2 VARIABLE GAIN USING EXTERNAL REFERENCE LEVEL
The BOP can function as a variable gain power amplifier similar to the fixed (inherent or nomi-
nal) gain amplifier as described in PAR. 3.4.1.1. The user can determine a new (lower) full scale
output value for the ±10V reference level (applied at pin 11, referenced to pin 10, of the Analog
I/O port) by configuring the Reference input as follows:
NOTE: Power-up switch S3 must either be set to 00000 or S3-2 and S3-5 must be set to 1
(on) prior to power-up, otherwise the analog reference signal applied to Analog
I/O Port pin 11 will have no effect.
For an external reference of ±10V, the nominal voltage gain (G
NOM-V
) of a BOP 36-28GL is
36/10 = 3.6. If the new full scale voltage for 10V is set to 29V, the voltage gain is changed from
3.6 to 29/10 = 2.9. The gain can be changed only using digital CURR:MODE (see PAR. B.27)
and VOLT:MODE (see PAR. B.94) commands, but the output is controlled by the external refer-
ence signal.
Once the feature is configured, the new full scale value is entered by changing the active setting
value of the main channel. This determines the full scale output to be produced by a 10V exter-
nal reference. The command sequence that can be used is:
FUNC:MODE VOLT Sets unit to voltage mode.
VOLT:MODE GAIN Enables gain mode of operation.
VOLT 29 For 10V at Analog I/O pin 11, output level set to 29V.
CURR:PROT 28.3 Sets protection level to maximum.
To restore the above settings for power up, send *SAV1. This saves the settings to memory
location 1 (locations 1 through 15 can be used to establish initial power-up conditions). Set
power-up switch S3 to 00001 when performing a normal power-up (PAR. 3.3.2.2) to restore the