Protection Features
5. Protection Features
The load includes the protection features: Over power, Over current, Over temperature, Fan
fail, Abnormal Alarms for Over Voltage and Load Fail.
Fan speed detection and OTP are built in the hardware circuit. The rest protective features
are from estimation of the DSP. The Load’s buzzer will beep sound to inform you till protection
or alarm status is reset. When any of the protection or alarm occurs, the loading current will
turn off.
5.1 Over Voltage Protection (OVP)
The over voltage alarm point is set at 360V
rms
/ 510V
DC
which is calculated by DSP. It is
specified in the Load specification.
When the over voltage alarm happens, please turn off the power supply of the UUT, or the
load will cause a un-recovery damage in this situation because abnormal voltage wears of
power devices of the load.
5.2 Over Current Protection (OCP)
The protection method is set the protected current at 3 A
rms
/ 3 A
DC
over the full scale current.
The value is specified in the Load specification.
5.3 Over Power Protection (OPP)
The over power protection is caused by the unconditional driving of the load. Protection level
is set at a level above 4600W @ AC / 4600W @ DC of the indicated power. The over power
status register bit is set when the OP condition occurs, and will remain set till it is reset.
5.4 Over Temperature Protection (OTP)
The Load has an over temperature protection circuit, which will turn off the load if internal
temperature exceeds the safe limits. The over temperature status register bit is set when the
OT condition occurs, and will remain set till it is reset.
5.5 Fan Fail
The Load has a fan fail protection circuit, which will turn off the load if any of the fans is out of
order. The fan fail status register bit is set when the condition occurs, and will remain set till it
is reset.
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