Rockwell Automation 20Y PowerFlex Active Front End - Manual (Page 85)

Rockwell Automation Publication 20Y-UM001E-EN-P - July 2014 85
Startup Chapter 3
The precharging of the units automatically starts when input power is
present. When the DC Bus Voltage reaches its nominal value, the
contactor closes.
To stop the AFE, turn the OFF-ON-START switch to OFF.
NOTE: Pressing the (Stop) key on the HIM only stops the AFE
output—it does not open the input contactor to stop the AFE.
When a voltage drop or a blackout occurs in the supplying network, the
unit precharges automatically and closes the input contactor when the
main supply voltage returns.
2. MAN —Manual operation by the OFF-ON-START switch on the
enclosure door.
a. Set the REM-AUTO-MAN switch to MAN.
b. Turn the OFF-ON-START switch to START and let it automatically
return to ON.
The precharging takes about 5-10 seconds depending on the connected
DC bus capacitance. When the DC bus voltage has reached its nominal
value, the AFE control automatically closes the contactor.
The precharging can be aborted by turning the switch to OFF.
To stop the AFE, turn the OFF-ON-START switch to OFF.
NOTE: Pressing the (Stop) key on the HIM only stops the AFE
output—it does not open the input contactor to stop the AFE.
When a voltage drop or a blackout occurs in the supplying network, the
input contactor opens. To turn on the AFE, turn the OFF-ON-START
switch to START and let it automatically return to ON.
3. REM —Remote operation with signals to the control terminals.
a. Set the REM-AUTO-MAN switch to REM.
b. Connect a normally closed (NC) contact to terminals X3:58 and
X3:61.
This contact has to be in the NC-state for the AFE to precharge and
run. A remote pulse of 0.4…1.0 second duration connected to terminals
X3:57 and X3:60 starts the precharging of the AFE. When the DC
voltage has reached its nominal value, the AFE unit automatically closes
the input contactor.
To stop the AFE, turn the OFF-ON-START switch to OFF.
NOTE: Pressing the (Stop) key on the HIM only stops the AFE
output—it does not open the input contactor to stop the AFE.
When a voltage drop or a blackout occurs in the supplying network, the
input contactor opens. When the supply is restored, the precharging
must be re-initiated. To turn the AFE on, turn the OFF-ON-START
switch to START and let it automatically return to ON.