Function and Features
Copyright © ITECH Electronic Co., Ltd. 42
hardware over-current protection and software over-current protection.
Hardware over-current protection: maximum load current of the electronic
load is limited within about 110% of the existing current range by hardware.
When the hardware triggers over-current protection, OC bit of the status
register will be set; when such protection is removed, the OC bit will be
reset. The existing On/Off status of load will not be changed by the
hardware over-current protection.
Software over-current protection: the user can set load software
over-current protection value following steps: press [Shift]+ 5 key >Protect>
A-limit (set as ON). A point is set as OCP current value and A delay set as
pre-alarm delay time. When software over-current protection function is on,
if the loading current value exceeds delay of such over-current 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 over-current 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 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.
3.17.3 Over-power protection (OPP)
The electronic load is provided with two kinds of overpower protections:
hardware over-power protection and software overpower protection.
Hardware over-power protection: the user can set load hardware
overpower protection. Load overpower will be limited to existing power
value. The existing 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: [Shift] + 5 >Protect>Point Set 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.
3.17.4 Over-temperature protection (OTP)
When internal power device of load is higher than about 85 °C, the load is
under temperature protection. At this time, the load will automatically be OFF
and VFD will display OTP. At the same time, OT and PS bits of the status
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