AMETEK SLH Series RevC - Manual (Page 51)

Sorensen SLH-Series DC High Power Electronic Load Operation
3.9
I-MONITOR
The I-monitor BNC is designed to monitor the Electronic load's input current or short current.
An isolated amplifier output 0V to 10V full-scale signal indicates the zero to full-scale current for
each Electronic load module.
The isolated voltage is 250V between load module and I-monitor BNC output, and it has the
same ground potential with mainframe (i.e., GPIB ground potential).
The isolated I-monitor feature provides an ideal solution for power supply testing, it is designed
to eliminate the ground problem while connecting I-monitor BNC and measure power supply
output voltage to oscilloscope simultaneously, because the two or more input BNC terminals in
the oscilloscope are not isolated.
This feature is also very useful while testing a dual or more outputs power supply which has
positive and negative polarity output simultaneously, because the I-monitor output is isolated
from each load module or each power supply output. It is convenient and free of ground
problem while monitoring the current signal from the I-monitor BNC connector.
3.10 PROTECTION FEATURES
CAUTION: Never apply the AC line voltage or input voltage exceeding the rated voltage
to the input terminals. It may cause damage of the electronic load module.
There are five protection functions for the SLH-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 4 functions will come to effect. When any one
protection comes to effect, the load will be automatically be switch OFF to protect electronic
load. Also, protection status is indicated by flickering to allow the user understand present
condition.
• If the any of the five protection circuits is tripped, the electronic load input turns OFF
immediately to protect the abnormal condition.
• The SLH-series DC electronic load will reset the Over voltage, Over current, Overpower
and Over temperature protection if the protection condition is removed and the "LOAD"
key is pressed to the “ON" state.
3.10.1 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 OVP circuit is activated, and the upper 5-
character monitor on the front panel of the electronic load flashes “oVP”. The load will
automatically go to a LOAD OFF state.
• Once the over voltage condition is reset, the upper 5-character monitor will resume
normal operation.
CAUTION:
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.
M540074-01 Rev C 3-21