Vacon NX User Manual

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

Vacon NX Specifications

General

Product Type	AC Drive
Control Method	Scalar Control
Enclosure	IP00, IP21
Communication	Ethernet
Safety	STO (Safe Torque Off)
Protection Features	Overcurrent, Overvoltage, Undervoltage, Overtemperature, Short Circuit
Ambient Temperature Range	-10°C to +50°C (with derating above +40°C)
Cooling Method	Air-cooled, Liquid-cooled