BOP HIPWR 111315 3-19CAUTION: When working with active loads, always adjust the BOP protection limits tobe above the maximum values of voltage or current expected from the load.For example, when the BOP is operating in voltage mode sinking energyfrom a constant current type load, set the current protection limits of theBOP above the maximum current expected from the load.1. Press % from the power-up screen to enter the General Setup menu, then highlightMax/Min Settings and press ! to view. (If a Password is required, see PAR. 3.2.4.3 forinstructions.)2. Highlight the ±CPROTECT or ±VPROTECT max/min value and press ! to change it. Soft-ware limits are absolute values (do not use minus sign for negative limits). Use number keysto change the setting. Press $ to save, or % to abort.3. When complete, press $ to save for power-up, or # to abort, or % to apply the changes(without saving for power-up) and exit.4. Upon return to the power-up screen, the new protection limit (voltage or current) is com-pared against the protection limits in effect. If the new protection limit setting is below theexisting setting for the protection limit, the protection channel (voltage or current) is set tozero.3.3.4.3 EXTERNAL LIMITSThese limits are external analog signals which are converted within the BOP to digital signalsthat program the protection channels only: current protect in voltage mode and voltage protectin current mode. The range of each analog input signal is +1V to +10V, corresponding to arange for clamping the output between minimum, 10% of nominal (positive and negative), to+max/–min of nominal rating. Refer to PAR. 3.4.4 for details on implementing external limits.Table 3-4 explains the effect that these limits have in both voltage and current mode, and refer-ences the corresponding paragraph for changing the parameter in either local or remote mode.3.3.5 ENABLING/DISABLING DC OUTPUT POWERThe BOP output can be disabled (OFF) or enabled (ON) by toggling the STANDBY key in localmode or sending the SCPI OUTPut ON or OUTPut OFF command (see PAR. B.13) via theselected digital remote control bus (see PAR. 3.5). The behavior of the unit when disableddepends on the Load Type setting (see PAR. 3.3.6 and Table 3-6 for details).3.3.6 DETERMINING HOW THE UNIT RESPONDS WHEN OUTPUT IS OFF (LOAD TYPE)The BOP supports three Load Type selections (see Table 3-6) which determine how the powersupply responds when the output is off: ACTIVE, RESISTIVE and BATTERY. (Load type CUS-TOM (not normally active) permits customized settings to be implemented; for details contactconsult factory.) These selections are designed to provide proper operation with different loadtypes. It is important to note that the Load Type selection does not affect the settings of thepower supply for ON state; it only affects the main internal reference level and the protection lev-els during the OFF state.
