52 PRODIGIT
3-5 . Protection features
The protection features of the 3310F series Electronic load modules are as follows:
3.5.1. Overvoltage protection: The Electronic Load input will turn OFF if the overvoltage
circuit is tripped. The message OVP will be displayed on the LCD. When the OVP
fault has been removed the load can be set to sink power again. While the unit
will attempt to protect itself given an OVP state it is strongly advised to guard
against any potential OVP fault state by using external protection and the correctly
rated electronic load.
The Overvoltage protection circuit is set at a predetermined voltage and cannot be
adjusted. The OVP level is 105% of the 3310Fs nominal voltage rating.
CAUTION: Never apply an AC voltage to the input of the 3310F series Load.
Do not apply a DC voltage that is higher than 3310F Load Module’s rating. If
this advice is ignored it is likely that damage will be caused to the electronic
load module. This damage will not be covered by the warranty.
3.5.2. Over current protection (OCP): The OCP protection will engage if the current being
taken by the load reaches 105% of the load module’s maximum current. The
message OCP will be displayed on the front panel and the unit will switch to its
LOAD OFF state. Once the source of the over current has been removed the load
can be switched on again.
3.5.3. Over power protection (OPP): The 3310F series Electronic Load monitors the
power dissipation level. The input to the load is automatically switched to LOAD
OFF if the power dissipation is greater than 105% of the rated power input. If an
over power condition occurs the display will show OPP
3.5.4. Over temperature protection (OTP): The load module’s internal temperature at the
heat sink is monitored. If the temperature reaches approximately 90°C the OTP
message will be displayed and the unit will automatically switch to the LOAD OFF
state. If an OTP error occurs please check the ambient temperature is between 0
to 40°C. Also ensure that the front and rear air vents of the mainframe are not
obstructed. The air flow is taken from the front of the mainframe and exhausted
from the rear. Therefore a suitable gap needs to be left at the rear of the
mainframe. A minimum of 15cm is recommended. After a suitable cooling period
the load can be switched.
3.5.5. Reverse Polarity: The 3310F series load module will tolerate a reverse current up
to the maximum current rating of the load module. The ‘-‘ symbol will be shown on
the voltage and current displays.
Please note that damage will occur if the reverse current is higher than the load
module’s maximum rating. If a reverse current is noticed turn off and disconnect
the dc power source and turn the load off. The connections between the DC
Source and the Load Module can now be correctly made.
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