Disconnectors And Contactors; Load Sharing; Brake Resistor - Danfoss VLT AutomationDrive FC 301 Design Manual

Electrical Installation

9.6.2 Disconnectors and Contactors

Assembling of IP55/NEMA Type 12 (enclosure type A5)
with mains disconnector.
Mains switch is placed on left side on enclosure types B1,
B2, C1 and C2. Mains switch on A5 enclosures is placed on
right side.
9 9
Illustration 9.45 Location of Mains Switch
L1
T1
Enclosure type
A4/A5
B1
B2
Illustration 9.46 Terminal Connections for A4, A5, B1, B2
138
L2 L3 31
T2 T3 32
Type
Kraus&Naimer KG20A T303
Kraus&Naimer KG64 T303
Kraus&Naimer KG64 T303
®
VLT AutomationDrive FC 301/FC 302 Design Guide, 0.25-75 kW
L1
T1
Enclosure type
C1
C1
C2
Illustration 9.47 Terminal Connections for C1, C2

9.6.3 Load Sharing

The DC bus terminal is used for DC back-up, with the
intermediate circuit being supplied from an external
source. It uses terminals 88 and 89.
The connection cable must be screened and the max.
length from the frequency converter to the DC bar is
limited to 25 m (82 ft).
Load sharing enables linking of the DC intermediate
circuits of several frequency converters.
CAUTION
Note that voltages up to 1099 V DC may occur on the
terminals.
43
Load Sharing calls for extra equipment and safety
considerations.
CAUTION
Note that mains disconnect may not isolate the
frequency converter due to DC-link connection.
44

9.6.4 Brake Resistor

The connection cable to the brake resistor must be
screened and the max. length from the frequency
converter to the DC bar is limited to 25 m (82 ft).
1.
2.
MG33BF02 - Rev. 2013-12-20
L2 L3
T2 T3
Type
Kraus&Naimer KG100 T303
Kraus&Naimer KG105 T303
Kraus&Naimer KG160 T303
Connect the screen by means of cable clamps to
the conductive back plate on the frequency
converter and to the metal cabinet of the brake
resistor.
Size the brake cable cross-section to match the
brake torque.
13
14