12
228-1915
053119
KEPCO, INC.
131-38 SANFORD AVENUE
FLUSHING, NY. 11355 U.S.A.
TEL (718) 461-7000
FAX (718) 767-1102
http://www.kepcopower.com
email: [email protected]
DETERMINING HOW THE UNIT RESPONDS
WHEN OUTPUT IS OFF (LOAD TYPE)
The
BOP supports three Load Type selections (see Table 4)
which determine how the power supply responds when
the output is off: ACTIVE, RESISTIVE and BATTERY.
The Load Type selection does not affect the settings of
the power supply for ON state; it only affects the main
internal reference level and the protection levels during
the OFF state.
WARNING
For inductive loads, and especially
superconducting magnet type
loads, the inherent offset of the
BOP in the OFF state may generate
significant current in the circuit. A
properly rated switch in parallel
with a resistor must be connected
between the power supply and the
load. The switch must be open and
the BOP front panel LCD must read
0V, 0A before removing or installing
connections between BOP and
load.
Active.
Active mode (default setting) is necessary for
the power supply to function properly and safely with
inductive loads and constant-current-type active elec-
tronic loads. Active mode can also be used with resis-
tive loads. Table 4 indicates how the power supply
responds to a command to go from Output ON to OFF.
When the output is disabled, the unit is set to voltage
mode, voltage is set to zero and both current protect
and voltage limit are set to maximum. When the unit is
enabled, the pre-existing settings for voltage, current
protect and voltage limit are restored.
FIGURE 8. MAX/MIN SETTING MENU
TABLE 4. POWER SUPPLY BEHAVIOR WHEN OUTPUT IS SET TO OFF
LOAD TYPE
SETTING
If unit was in Voltage Mode when output OFF
command issued.
If unit was in Current Mode when output OFF
command issued.
ACTIVE
• Unit remains in voltage mode.
• Voltage set to zero.
• Both ± Current Protect set to maximum.
• Both ± Voltage Limit remain at maximum.
• Unit set to voltage mode.
• Voltage set to zero.
• Both ± Current Protect remain at maximum.
• Both ± Voltage Limit set to maximum.
RESISTIVE
• Unit remains in voltage mode.
• Voltage set to zero.
• Both ± Current Protect set to minimum box values.
• Both ± Voltage Limit. remain at maximum.
• Unit remains in current mode.
• Current set to zero.
• Both ± Current Protect set to minimum box values.
• Both ± Voltage Limit set to maximum,
BATTERY
• Unit set to current mode.
• Current set to zero.
• Both ± Voltage Protect. remain at maximum.
• Both ± Current Limit set to maximum.
• Unit remains in current mode,
• Current set to zero.
• Both ± Voltage Protect set to maximum.
• Both ± Current Limit remain at maximum.
VOLTAGE
SOURCE
VOLTAGE
CURRENT
0.0000 0.0000
