11
vacon • 188
Non-regenerative front end
Local contacts: http://drives.danfoss.com/danfoss-drives/local-contacts/
11.11
DC pre-charging circuit
Each Non-regenerative Front End unit requires its own external pre-charging circuit. The purpose
of the pre-charging unit is to charge the voltage in the intermediate circuit to a level sufficient for
connecting the Non-regenerative Front End unit to the mains. The charging time depends on the
capacitance of the intermediate circuit of the total common DC-bus system and the resistance of
the charging resistors. The technical specifications of manufacturer's standard pre-charging
circuits are shown in Table 81. The pre-charging circuits are suitable for 400-500 Vac and 525-690
Vac.
The pre-charging duration and DC voltage level are monitored by the NXP control. The DC voltage
level must be over 40VDC after 1 second charging and final pre-charging voltage level must be
reached within the maximum charging time. If these conditions are not reached, a charging fault is
issued. The maximum charging time can be set by a parameter.
The pre-charging components can be ordered separately. The pre-charging circuit includes the
following components: 2 pcs charging resistors, the contactor, the diode bridge and the snubber
capacitor, see Table 82. Each pre-charging circuit has maximum charging capacity, see Table 81. If
the capacitance of the intermediate circuit in the total system exceeds the values shown, contact
your nearest distributor.
Table 81. Capacitance Min and Max value for Pre-charging circuit
Pre-charging circuit ratings
Pre charging type
Resistance
Capacitance
Min
Capacitance
Max
CHARGING-AFE-FFE-FI9
2 x 47 R
4950 μF
30000 μF
CHARGING-AFE-FFE-FI10
2 x 20 R
9900 μF
70000 μF
CHARGING-AFE-FFE-FI13
2 x 11 R
29700 μF
128000 μF
Table 82. Type designation code for the pre-charging components configuration
FI9 AFE / CHARGING-AFE-FFE-FI9
Item
Q‘ty
Description
Manufacturer
Product Code
1
1
Diode Bridge
Semikron
SKD 82
2
2
Charcing resistors
Danotherm
CAV150C47R
3
1
Snubber capacitor
Rifa
PHE448
4
1
Contactor
Telemecanique
LC1D32P7
FI10 AFE / CHARGING-AFE-FFE-FI10
Item
Q‘ty
Description
Manufacturer
Product Code
1
1
Diode Bridge
Semikron
SKD 82
2
2
Charcing resistors
Danotherm
CBV335C20R
3
1
Snubber capacitor
Rifa
PHE448
4
1
Contactor
Telemecanique
LC1D32P7
Содержание NX
Страница 1: ...vacon nx ac drives liquid cooled drives user manual ...
Страница 2: ......