Protection Features - Prodigit 33501 Series Operation Manual

3-6. Protection features

The 33501 Series Electronic load modules include the following protection features:
3-6-1 Over voltage
3-6-2 Over current
3-6-3 Over power
3-6-4 Over temperature
3-6-5 Reverse Polarity
The Over voltage protection circuit is set at a predetermined voltage (63V for 33501) which
can not be changed. If the Over voltage circuit has tripped, it Electronic load input turns OFF
immediately to protect the abnormal condition.
When the Over voltage condition is occurred, the Digital Current Meter's LCD display will
indicate " OVP ".
CAUTION : Never apply the AC line voltage or input voltage excised than 60V, or it
may cause damage of the electronic load module.
The 33501 Series Electronic load can monitor the power dissipation of the load module,
when the power dissipation is greater than 105% of rate power input, the load module will
turn load to OFF state internally.
When the Over power condition is occurred, the Digital Current Meter's LCD display will
indicate " OPP ".
As soon as the temperature of 33501 Series heat sink greater than 85 degree, the Over
temperature protection is occurred, the Digital Current Meter's LCD display will indicate " OtP
" at same time, the 33501 Series Electronic Load will turn load to OFF state internally.
Please check the environment condition such as the ambient temperature and distance
between the rear panel of Electronic load mainframe and wall is greater than 15cm.
The 33501 Series Electronic load can reset the Over voltage, Over correct, Overpower and
over temperature protection if the protection condition is removed and press the " LOAD " key
to " ON " state.
The 33501 electronic load conducts reverse current when the polarity of the DC source
connection is incorrect. The maximum reverse current is 240A for 33501. If the reverse
current excesses the maximum reverse current, it may cause damage of the 33501
Electronic Load.
When the reverse condition ，the reverse current is displayed on the 4 1/2 digit Current
Meter on the front panel, and the 4 1/2 digit DCM indicates negative current reading,
whenever the reverse current is displayed on the current meter, turn OFF power to the DC
source and make the correct connections.
33501 Series Operation Manual 3-23