Error Underpotential (Up / Puready) - KEB COMBIVERT F6 Programming Manual

Protection functions

Error underpotential (UP / PUready)

Index Id-Text Name
0x2020 de32 inverter minimum DC voltage
0x3512 is18 UP error level
0x3513 is19 UP reset level
0x2A4C pn76 UP2 delay time
0x2A4D pn77 E.UP2 stopping mode
0x2A53 pn83 auto-retry activation
0x2A54 pn84[1] auto-retry UP time
0x2A54 pn84[2] fault suppression mode
0x2A54 pn84[3] auto retry UP acceleration
4.4.14.1 Precharging of the DC link
If the DC link voltage falls below the UP threshold, the circuit for the current-limited
precharging of the DC link is activated.
Below the UP threshold, the switching power supplies connected to the high volt-
age also become inactive. This triggers error 123: ERROR PUready. Since the UP
level is fallen below when the voltage is switched off before the switching power
supplies become inactive, error "ERROR PUready" is normally never visible to the
outside.
"5: phase failure" is displayed in parameter
Precharging occurs via precharging resistors, which are bridged after completion of
precharging either via a relay (case size 2) or input thyristors.
The difference between the DC link voltage and the mains input voltage is moni-
tored from housing size 4.
The power unit ready signal is only set when the high-voltage supplied power units
are in operation and the voltage difference monitoring also sends the "ready" sig-
nal.
When the power unit ready signal is applied and the UP reset threshold is ex-
ceeded, the precharge time implemented in the software also elapses. After this
time, the precharging circuit is deactivated again and the state of parameter
supply unit state
The time until the UP reset threshold is reached or the power unit ready signal is
set is only defined by the hardware (temperature-dependent precharging resistors).
If the error was triggered by a short power failure, the restart time can be optimized
by reducing the software waiting time. For this, bit 2 "reduced charging" must be
activated in pn84[2] fault supression mode.
pn84[2] fault suppression mode
Bit Plaintext
4: reduced charg-
1
ing
This reduced charging time is only selectable for Auto-Retry UP / LTready.
78
changes to "4: run".
Note
The reduced charging time is activated with Auto Retry UP.
(For a description of the function, see chapter 4.3.2.2 Automatic fault
reset UP)
Function
Default value to trigger the undervoltage error
Tripping level for the UP error
Reset level fo the UP error
Delay time of error triggering of UP2
Response to the UP2 error
Activation of an automatic error reset
Time limit of the automatic error reset
Activation of a reducted precharge time
Activation of an alternative ramp after Auto-Retry
UP/PUready
ru04 supply unit state.
0x2A54 [2]
ru04
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