Protective functions
© KEB, 2012-10 COMBIVERT F5-A, -E, -H Page 7.13 - 5
7
7.13.1.1 underpotential
"Error! Undervoltage" (E.UP) is triggered if the DC link voltage drops due to brownouts or a generally too weak
power grid. For this error, the automatic restart can be activated.
Suppression of E.UP and no PU at inactive control release
Pn.84 no PU / E.UP deceleration time
Value range: 0 (off) ... 32.00 s; Resolution: 0.01 s; Default value : 0(off)
The following function is activated with this parameter (value <> 0):
With inactive control release E.UP is no ERROR (status word), ru.00 displays nevertheless E.UP
With inactive control release no PU is no ERROR (status word), ru.00 displays nevertheless NO_PU
Other malfunctions (e.g. E.EF, E.dOH) are triggered furthermore
If the control release is activated, E.UP or no PU is triggered after the adjusted time is up, if the condition is still
met (DC link too low or LT_OK signal not active).
If no E.UP or no PU is once activated as ERROR, the status remains until reset.
Reset is only possible at activated control release if the DC link is high enough and/or the signal LT_OK is
active.
If the control release is deactivated, status ERROR is deactivated with a reset.
DC link level to activate the load-shunt
Pn.77 Load-shunt activation voltage
Value range: 0 (off)-1500 V, default value: 0 (off)
Internal lower limit: E.UP-Level (dependent on power unit)
Internal upper limit: E.UP-Reset level - hysteresis (dependent on power unit)
Function:
The function is deactivated with active modulation.
The load-shunt is activated if the modulation is already deactivated (e.g. nop) and the DC link voltage falls
below Pn.77. The status is E.LSF.
E. UP is triggered if the voltage drops below the E.UP level or after 10 s in E.LSF status, if the voltage does
not rise again.
The charging relay time for deactivation of the load-shunt starts as before, if DC bus voltage rises again above
the E.UP reset level.
To ensure a safe operation Pn.77 should be adjusted smaller max. by the hysteresis than the internal upper
limit .
Overview voltage level
Voltage class E.UP-Level standard E.UP-Reset level Hysteresis
230 V 216 V 230 V 5 V
400 V 240 V 300 V 10 V
690 V 360 450 V 15 V
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