BOP HIPWR 031912 3-21RESISTIVE. This mode, as the name suggests, is useful for resistive loads. Table 3-6 indicateshow the power supply responds to a command to go from Output ON to OFF.Accessing the BOP after the output is disabled in BATTERY mode ishazardous because (1) high current arcing is possible and (2) either theexternal battery voltage, or the voltage (±Voltage Protection max) onthe BOP output terminals may be dangerous. Therefore, for battery andconstant-voltage-type active electronic loads it is recommended thattwo properly rated external switches be installed for safety: one inseries with the battery, and one across the BOP output. After the unit isset to OFF, first open the switch in series with the battery, then closethe switch across the BOP output to ensure safety before handlingBOP connections. When connecting the battery, the switch across theoutput should be opened after the connections are complete and thenthe switch in series with the battery should be closed. If the constant-voltage-type active electronic load is adjusted to zero before handlingthe power supply-to-load connections, only the switch across the BOPoutput is required.BATTERY. This mode is necessary for the power supply to function properly and safely witheither battery or constant-voltage-type active electronic loads. This mode prevents the batteryfrom discharging during the OFF state. When the output is disabled (set to OFF), the BOP willgo to current mode, current will be set to zero, with voltage protect and current limit set to maxi-mum. In this way the battery will not be discharged while the output is OFF. For constant-volt-age-type active electronic loads this mode stops energy flow during the OFF state. Table 3-6indicates how the power supply responds to a command to go from Output ON to OFF.To configure, press % from the power-up screen, then highlight Load Type and press ! tomodify. (If a Password is required, see PAR. 3.2.4.4 for instructions.) Highlight Active, Resistiveor Battery (see explanations and associated WARNINGS above) and press $ to save. Thenpress $ to save for power-up, # to abort, or % to apply the changes (without saving forpower-up) and exit. After configuring, the new setting will be effective when the power supplygoes from output on to output off.To restore factory default (Active), press % from the power-up screen, highlight Load Type,press !, then press @ to restore default. Press $ to save for power-up or % to exit3.3.7 CHANGING THE DEFAULT POWER UP SETTINGSWhen the BOP is shipped, the following default settings are programmed to be in effect eachtime the unit is turned on, however these defaults may be changed as indicated below;• Mode: Voltage (may be voltage or current, see PARs. 3.3.2 and 3.4.2. Table 3-7 illus-trates the relationship between Mode, Main Channel, Protection Type and Levels set-tings.• Main Channel: Internal (may be Internal, External, or External Reference Level, PARs.and 3.4.3).• Protection type: Internal (may be Internal, External, Lesser Limit) (see PARs. and 3.4.4)• Levels, Voltage and Current: maximum (see PAR. 3.4.4) Represents the power-up val-WARNING
