10. AC line power fail
Crate without Option UPS (Uninterruptible Power Supply)
If a power fail is detected by the crate controller, which is connected to a crate without option UPS, the controller shuts down all
high voltages with a very fast ramp (1,000 percent = tenfold of nominal voltage per second), to avoid uncontrolled floating high
voltages.
If the AC line goes bad, the crate status bit Power Fail and it's corresponding Crate Event Status bit is set and the crate controllers
STATUS LED lights red.
Crate with Option UPS (Uninterruptible Power Supply)
The function UPS offers protection against AC line power fails. This protection is provided by a power supply with integrated
batteries. The battery backup time is long enough to safely ramp down all high voltages before power loss.
CAUTION!
CAUTION!
Please make sure that the extra fuse for UPS use is applied to the crates power supply.
Open the fuse when transporting the crate.
The high voltage modules and the crate controller are supplied from the internal battery while the AC line is bad.
After ten seconds of line power fail, all modules begin to ramp down the high voltage with a ramp speed of two percent of
nominal voltage per second, which takes approx. 50 seconds when starting at maximum voltage.
Additional status and measurement values with UPS:
•
The Crate Status bits Low +24 Battery and High +24 Battery are set when the measured battery voltage exceeds the
limits.
•
The measured battery voltage can be read out by Crate Supply Measurement channel 8.
•
The Crate Status bit High +24 Battery is also a hint for an open battery fuse.
Crate Controller CC24/CC23 | Last change on: 14.04.2020 |
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