Over Power Protection (Opp); Over Temperature Protection (Otp); Reverse Voltage Alarm (Lrv); Sense Protection - ITech IT8700P+ Series User Manual

time before alarm. When the software OCP function is active, if the load
current value is over the over current protection set value, load will
automatically off, VFD displays OCP. At the same time, the OC and PS bits
in the status register will be set and they will remain until they are reset.
Operations to clear the OCP state:
Check whether the input current is within the load's rated current or the
programmed protecting current ranges, if it is outside the range, please
disconnect the instrument under test. Press any key on the front panel (or send
commandPROTection:CLEar), the (OVP) displayed on the front panel will
disappear, load exits OCP protection state.

4.11.3 Over power protection (OPP)

The electronic load includes both hardware and software OPP features.

Hardware OPP: the electronic load allows user to set a power protection
limit in hardware which will limit the power in the range you set when the
OPP condition occur. Hardware OPP will not change the load ON/OFF
state.

Software OPP: users can set load's software OPP value, steps:
Shift+5>Protect>Point set OPP power value, Plimit set alarm delay. If the
load power value is OPP delay time, load will automatically turned off, VFD
will display OPP. At the same time, the OP and PS bits in the status register
will be set and they will remain until they are reset.
Operations to clear the OPP state:
Check whether the input power is in the rated power range or the programmed
protecting ranges. If it is outside the range, please disconnect the instrument
under
commandPROTection:CLEar), the (OPP) displayed on the front panel will
disappear, load exits OPP protection state.

4.11.4 Over temperature protection (OTP)

When load's internal circuit temperature is over 85℃, load will enable OTP.
Input will automatically turned off, VFD display OTP. At the same time the OT
and PS bits in the status register will be set, they will remain until they are reset.
Operations to clear the OTP state:
when load temperature dropped to the protecting point, press any key on the
front panel(or send command PROTection:CLEar), the (OTP) displayed on the
front panel will disappear, load exits OTP protection state.

4.11.5 Reverse voltage alarm (LRV)

Once in reverse connection condition, main frame screen displays LRV, and
they will remain until the reverse connection is eliminated.
Operations to clear the reverse voltage state:
Check whether the connection is reversed. If so, disconnect the object to be
measured.

4.11.6 Sense protection

The instrument defaults to provide sense protection. The premise is that the
Sense switch is turned on. When the input state is ON and the difference
between input terminal voltage and sense remote voltage exceeds the
specified voltage, sense protection will be enabled. The instrument input will be
5 5
>Protect>Alimit set ON, Apoint set OCP current value, Adelay set delay
test. Press any
Copyright © Itech Electronic Co., Ltd.
key on the front
Operations introduction
panel (or send
58