KEPCO BOP-MG 1KW, Руководство оператора

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3-42
BOP HIPWR 111315
2. To return to digital or local control, from the power-up screen, press
$
, then highlight Ref-
erence Input and press
!
. Highlight Internal and press
$
to save. Then press
%
to
apply the changes (without saving for power-up) and exit.
NOTE: Each time the Reference Input setting is changed, the unit generates an internal *RST
reset command (see PAR. A.11) which requires the BOP output and/or protection limits
to be reprogrammed.
For an external reference of ±10V, the nominal voltage gain (G
NOM-V
) of a BOP 36-28MG 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 from the front panel, but the output is controlled by
the external reference signal and can not be changed from the front panel.
New Gain = New Full scale set at front panel / External reference that produces Full scale out-
put. This means that the External reference voltage, from +10V to –10V, can control the full
scale output voltage from +29V to –29V. The gain range is between zero and the nominal gain
of each model.
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 gain in voltage mode is G
V
= V
SET
/10 where V
SET
is the desired full scale voltage (in Volts)
entered at the front panel.
The gain in current mode is G
A
= I
SET
/10 where I
SET
is the desired full scale current (in
Amperes) entered at the front panel.
NOTE: If the system limits have been modified (PAR. 3.3.4), the output of the power supply will
never exceed the modified system limits.
3.4.4 EXTERNAL PROTECTION LIMITS
When PROTECTION LIMIT on the Reference Menu is set to EXTERNAL, the protect limits are
determined by four analog signals referenced to Ground (pin 12) which are applied to the Ana-
log I/O Port (see PAR. 3.4.4).
To be functional this feature must first be configured either from the front panel, or by sending
either CURR:MODE:PROT EXT (see PAR. B.31) or VOLT:MODE:PROT EXT (see PAR. B.99).
From the front panel power-up screen press
$
, and highlight Protection Limit. Press
!
to
modify, then highlight External and press
$
to save. Then press
%
to apply the changes
(without saving for power-up) and exit.
Only two signals are active , affecting the complementary protect channel, ±current protect
limit for voltage mode and ±voltage protect limit for current mode. A voltage b1V and
+10V at the following pins (referenced to Ground, pin 12) will control the corresponding protec-
tion parameter between 10% of the nominal value (see Figure 1-3) and the corresponding posi-
tive or negative nominal full scale value.
• –I_LIM_EXT (pin 5) - This +1V to +10V analog signal sets the negative current protect
limit from 10% of the nominal value to –full scale current. +10V corresponds to rated
minimum (maximum negative) current (e.g., for BOP 36-28MG, +10V sets negative cur-
rent limit to –28A).