KEPCO BOP-GL 1KW Quick Start Guide - Manual (Page 12)

12
228-1699 REV 2 093013
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]
WARNING
For inductive loads, and especially
superconducting magnet type
loads, the inherent offset of the
BOP-GL in the OFF state may gen-
erate significant current in the cir-
cuit. A properly rated switch in
parallel with a resistor must be
connected between the power sup-
ply and the load. The switch must
be open and voltage and current
measurements at the output 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
electronic loads. Active mode can also be used with
resistive loads. Table 6 indicates how the power sup-
ply 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 volt-
age, current protect and voltage limit are restored.
WARNING
For both inductive loads and con-
stant-current-type active electronic
loads, when the BOP-GL output is
set to OFF, a path is provided for
absorbing either the energy accu-
mulated in the reactance of the
load during the ON state, or energy
delivered by an electronic load.
This prevents damage to the load
and power supply as well as pro-
viding safety for the user. However,
in addition to the built-in safety fea-
tures, constant-current-type active
electronic loads must be adjusted
to zero and voltage and current
measurements at the output must
read 0V, minimum current, before
handling the power supply-to-load
connections.
Resistive. This mode, as the name suggests, is
useful for resistive loads. Table 6 indicates how the
power supply responds to a command to go from
Output ON to OFF.
WARNING
Accessing the BOP-GL after the
output is disabled in BATTERY
mode is hazardous because (1)
high current arcing is possible and
(2) either the external battery volt-
age, or the voltage (±Voltage Pro-
tection max) on the BOP-GL output
terminals may be dangerous.
Therefore, for battery and constant-
voltage-type active electronic loads
it is recommended that two prop-
erly rated external switches be
installed for safety: one in series
with the battery, and one across the
BOP-GL output. After the unit is set
to OFF, first open the switch in
series with the battery, then close
TABLE 6. 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.