Control Unit - Vacon NX Active Front End User Manual

Installation
Figure 47. Terminal X3 (U-phase in FI13) in the unit
5.3.3.2 LCL filter without DC/DC power supply for fan
The LCL filter is supplied without an integrated DC/DC power supply. In this case, the customer
must procure the power supply separately. The requirements for the DC power supply are shown
in Table 2. Short-circuit protection is implemented by protecting the input of the DC power with
fuses. When required, the cooling fan can be controlled on/off by installing a contactor in the DC
power supply input and controlling that depending on whether the main switch is open or closed.
The over-temperature protection of the LCL filter must always be wired from contacts 1 and 4 of
terminal X52 to a digital input of the control unit (see Appendix 81) and from contacts 1 and 2 of
terminal X51 to a digital input of the control unit.
LCL filter with external DC/DC supply
LCL filter
Tempe-
rature
Switch
Over-tempera-
ture protection
Fan Tempe-
M
Switch
X51
24-hour support +358 (0)201 212 575 • Email: vacon@vacon.com
X51: (4-pin)
1 = Over-temperature
protection switch
2 = Over-temperature
protection switch
3 = DC- (supply)
4 = DC+ (supply)
rature
X52: (4-pin)
1 = Over-temperature
protection switch
Over-
4 = Over-temperature
temperature
protection
protection switch
Figure 48. Wiring diagram of external DC-power
The wiring of the circuit is shown in Figure 48.
AFE unit
)

Control unit

DIN2 DIN3
DC supply
(48 Vdc)
vacon • 67
11164.emf
5