AMETEK SLM Series RevC - Manual (Page 47)

Sorensen SLM-Series DC Load Operation
M540071-01 Rev C 3-19
3.2.8 Protection Features
CAUTION: Never apply the AC line voltage or input voltage in excess of the rated
voltage, to the input terminals. It may cause damage to the electronic load module.
There are five protection functions for the SLM-Series DC electronic load: over-voltage, over-current,
over-power, over-temperature and reverse polarity. When an electronic load exceeds the normal work
area range, one of the above protection functions activates and switches the load off. The 5-digit
display flashes which condition notifies the user of the protection status.
• If the any of the protection circuits is tripped, the electronic load immediately shuts down to
protect against the abnormal condition.
• The SLM-series DC electronic load automatically resets the Over voltage, Over current,
Overpower and Over temperature protection once the input returns to below maximum
rating and the "LOAD" key is pressed to the “ON" state.
Over voltage
• The protection point of over voltage protection (OVP) is preset in the load. The activation
values are shown in Table 3-3.
• When an over-voltage condition occurs, the upper 5-digit monitor on the front panel of the
electronic load flashes “oVP”. The load automatically goes to a LOAD OFF state.
• Normal operation may be resumed once the input falls below maximum rating.
WARNING: The OVP circuit does not protect against severe over voltage
conditions. Voltages above 60V, 400V and 900V applied across the input
terminals of 60V-rated, 250V-rated and 500V-rated loads, respectively, will
permanently damage the electronic load. This damage will require factory repair.
Over Current (OCP)
• The protection point of over current protection (OCP) is preset in the load. The activation
values of the OCP circuit are shown in Table 3-3.
• When an over-current condition occurs, the lower 5-digit monitor on the front panel of the
electronic load flashes “oCP”. The load automatically goes to a LOAD OFF state.
• Normal operation may be resumed once the input falls below maximum rating.
Over Power (OPP)
• The protection point of over power protection (OPP) is preset in the load. The activation
values of the OPP circuit are shown in Table 3-3.
• When an over-power condition occurs, the upper 5-digit monitor on the front panel flashes
“oPP”. The load automatically goes to a LOAD OFF state.
• Normal operation may be resumed once the input falls below maximum rating.