3.5 Delayed Trip
3.5.1 Operating principle
The function "
Delayed Trip
" provides a user-configurable, time-delayed response to an increased output current (I
out
) higher than
the set current (I
set
). The response to this kind of event can be, for example, to ramp down the channel with the programmed
ramp. A detailed description for the configuration can be found in the manual
“
CAN_EDCP_Programmers-Guide.pdf
”,
see chapter 11 Appendix.
By a programmable timeout with one millisecond resolution, the trip can be delayed up to four seconds. During this time, the
output current is limited to the value of I
set
(constant current mode).
The hardware regulation signals, constant voltage (CV) or constant current (CC), are sampled every millisecond by the
microprocessor. Once the constant current mode is active, the programmed timeout counter is decremented. If the HV channel
returns to constant voltage mode before timeout (i.e. I
out
< I
set
), the counter will be reset. So this process can be restarted if the
current rises again.
3.5.2 Limitations
For some older types of HV modules with single-channel floating GND the current set value cannot be set exactly to zero
(e.g., due to an uncompensatable offset). For these modules, the limitation of the output current to very low values (< 0.5 % I
nom
)
is not guaranteed.
For all recent EHS models the value of the set current can be continuously adjusted with the type-specific resolution down to
zero.
To guarantee a sufficient resolution for the current set values, a nominal current adequate to the application should be selected.
iseg offers HV modules with nominal currents reduced to 100 μA or 10 μA in all voltage classes. These are designated e.g. for
semiconductor detectors, which only require a few microampere operating current.
EHS High Voltage Power Supply series | Last changed on: 2022-03-14 |
www.iseg-hv.com
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