Function and Features
Copyright © ITECH Electronic Co., Ltd. 43
will sound if the overvoltage circuit is triggered. OV and VF bits of the status
register will be set and OVP will be displayed on the screen of the load till
resetting. In case of overvoltage protection, the VF pin of the 8-pin
connector on rear board of the load outputs TTL high level and the VF pin
can be used for controlling output status of the power to be tested.
Clear overvoltage protection status: Inspect whether voltage of object
under test is within load rated voltage or set protection voltage range. If not,
disconnect the object. Press any key on load front board (or send
command to PROTection:CLEar), the load front board (OVP) word will get
cleared and the load will exit OVP protection status.
Overcurrent protection (OCP)
The electronic load is provided with two kinds of overcurrent protections:
hardware overcurrent protection and software overcurrent protection.
Hardware overcurrent protection: maximum load current of the
electronic load is limited within about 110% of the existing current range by
hardware. When the hardware triggers overcurrent protection, OC bit of the
status register will be set; when such protection is removed, the OC bit will
be reset. The On/Off status of load will not be changed by the hardware
overcurrent protection.
Software overcurrent protection: the user can set load software
overcurrent protection value following steps: press [Shift] + 9(Config)
key >Protect> A-limit ( set as ON). I point is set as OCP current value and A
delay set as pre-alarm delay time. When software overcurrent protection
function is on, if the loading current value exceeds delay of such
overcurrent protection set value, the load will automatically be OFF and the
VFD will display OCP. At the same time, OC and PS bits of the status
register will be set and keep till reset.
Clear overcurrent protection status: Inspect whether current of object
under test is within load rated current or set protection current range. If not,
disconnect the object. Press any key on load front board (or send
command to PROTection:CLEar), the load front board (OCP) word will get
cleared and the load will exit OCP protection status.
Overpower protection (OPP)
The electronic load is provided with two kinds of overpower protections:
hardware overpower protection and software overpower protection.
Hardware overpower protection: the user can set load hardware
overpower protection. Load overpower will be limited to existing power
value. The On/Off status of load will not be changed by the hardware
overpower protection.
Software overpower protection: the user can set load software
overpower protection value following steps: press [Shift] + 9(Config)
key >Protect> Point set OPP power value. P limit is set as pre-alarm delay
time. If the loading power value exceeds delay of such overpower
protection set value, the load will automatically be OFF and the VFD will
display OPP. At the same time, OP and PS bits of the status register will be
set and keep till reset.
Clear overpower protection status: Inspect whether power of object
under test is within load rated power or set protection power range. If not,
disconnect the object. Press any key on load front board (or send
command to PROTection:CLEar), the load front board (OPP) word will get
cleared and the load will exit OPP protection status.
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