General
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1
1.6
Charting of DC
This AFE application has its own charging control, P2.5.1.13 DC Charge (24 Vdc required for control
board) and charging protection in case the external charging cannot get DC voltage to required level
within set time P2.9.1.6 Charge Max Time (provided that the DC Voltage reaches the under voltage
fault level).
The charging function is activated when P2.5.1.13 DC Charge is A.1 or higher. When the control place
is IO, Keypad or NCDrive, charging is started from the start command.
Charging is not started if:
-
Drive is in fault state.
-
P2.4.2.26 Enable CB Close is FALSE
-
P2.4.2.8 Run Enable is FALSE
-
P2.4.2.19 Quick Stop is FALSE
Charging is also stopped if above conditions occur during charging or if the start command is
removed.
For fieldbus control, charging is started with B0 of FB Control Word on the supporting FB profiles.
Charging is also stopped if B0 goes low. Also MCB is opened if already closed.
DC Charge (F80) is given if 85 % of DC Nominal is not reached within P2.9.1.6 Charge Max Time and
charging is stopped.
DC Charging is stopped when the drive receives feedback from P2.4.2.4 MCB Feedback.
NOTE! Use suitably sized DC Charging resistor. To select the correct size, check Pulse loadability
for time duration set in for Max Charge Time parameter.
1.7
Main circuit breaker control (MCB)
The Micro Grid application controls the circuit breaker of the system with the relay output RO2.
When the DC bus is charged, the MCB will be closed. The status of the MCB is monitored via a digital
input. The digital input used for monitoring is selected with parameter P2.3.1.3. Faults can be set to
open the MCB by selecting a response to a fault to be
3=Fault, DC OFF
.
An external charging circuit is necessary to charge the DC bus but drive can control this circuit if 24
Vdc is provided for the control board.
Closing limit is 85% of the nominal DC Voltage.
Opening limit is 75% of the nominal DC Voltage.
Nominal DC Voltage = Grid Nom Voltage (P2.1.1) * 1.35.
Over Current (F1), Hardware IGBT (F31) and Software IGBT (F41) faults will open MCB immediately
to protect the drive.
NOTE! The MCB feedback is necessary for the correct operation of the Grid Converter application.
NOTE! Only the drive controls its own MCB. If additional interlocks or opening commands are
needed, these commands must go through the drive.
