AMETEK SLD Series - Manual (Page 45)

Sorensen SLD-Series DC Load Operation
M540075-01 Rev C 3-17
3.5
Protection Features
The SLD-series Electronic Load modules have four protection states to prevent unit damage
due to abnormal operating conditions: Over voltage, Over current, Over power and Over
temperature. Reset the protection by removing the triggering condition first, and then press the
"LOAD" key to "ON" state. The following subsections describe the protection features.
3.5.1 Over Voltage Protection (OVP)
The Over voltage protection circuit is set at a predetermined voltage 63V for all SLD-series
modules. If the Over Voltage condition is triggered, the electronic load input turns OFF
internally.
When the Over Voltage condition is triggered, the upper 5-character display indicates "Prot",
and the lower 5-character display indicates "oVP".

CAUTION:
Never apply the AC line voltage or input voltage in excess of 60V, or it may
cause damage to the Electronic load. The OVP circuit does not protect against
severe over voltage conditions. Voltages above 100V will permanently
damage the electronic load. This damage will require factory repair.
3.5.2 Over Current Protection (OCP)
The SLD-series Electronic load monitors the Load current, and when the load current is
higher than 102% of rate current input, the load module will go to Load OFF state.
When the Over Current condition is triggered, the upper 5-character display indicates "Prot"
and the lower 5-character display indicates "oCP".
3.5.3 Over Power Protection (OPP)
The SLD-series Electronic load can monitor the power dissipation of the load module, when
the power dissipation is greater than 102% of rate power input, the load module turns the
Load to OFF state internally.
When the Over Power condition is triggered, the upper 5-character display indicates "Prot"
and the lower 5-character display indicates "oPP".
3.5.4 Over Temperature Protection (OTP)
The SLD-series electronic Loads are designed with temperature sensors. If the temperature
of the module's heat sink rises to greater than 90°C, the Over Temperature protection is
triggered, at which point the upper 5-character display indicates "Prot," the lower 5-
character display indicates "otP," and the SLD-series Electronic Load turns the Load to OFF
state internally until the heat sink temperature drops to 70°C or below.