Ac Line Input Connections - Danfoss vlt fc 300 Instruction Manual

®
VLT Automation Drive FC 300 12-Pulse
How to Install
Instruction Manual High Power
attached to each inverter module terminal. The wires are
required to be equal length within 10% between the
inverter module terminals and the first common point of a
phase. The recommended common point is the motor
terminals.
F14 requirements: Motor phase cable quantities must be
multiples of 4, resulting in 4, 8, 12, or 16 (1, 2, or 3 cables
are not allowed) to obtain an equal amount of wires
attached to each inverter module terminal. The wires are
required to be equal length within 10% between the
inverter module terminals and the first common point of a
phase. The recommended common point is the motor
terminals.
Output junction box requirements: The length, a minimum
of 8 ft [2.5 m], and quantity of cables must be equal from
each inverter module to the common terminal in the
junction box.
NOTE!
If a retrofit application requires unequal amounts of wires
per phase, consult the factory for requirements and
documentation or use the top/bottom entry side cabinet
option.
3.3.9 Brake Cable Drives with Factory
Installed Brake Chopper Option
(Only standard with letter B in position 18 of typecode).
The connection cable to the brake resistor must be
shielded and the max. length from adjustable frequency
drive to the DC bar is limited to 82 ft [25 m].
Terminal No. Function
81, 82 Brake resistor terminals
Table 3.21
The connection cable to the brake resistor must be
shielded. Connect the shield by means of cable clamps to
the conductive backplate at the adjustable frequency drive
and to the metal cabinet of the brake resistor.
Size the brake cable cross-section to match the brake
torque. See also Brake Instructions, MI.90.Fx.yy and MI.
50.Sx.yy for further information regarding safe installation.
WARNING
Note that voltages up to 1,099 V DC, depending on the
supply voltage, may occur on the terminals.
F Frame Requirements
The brake resistor(s) must be connected to the brake
terminals in each inverter module.
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3.3.10 Shielding against Electrical Noise
Before mounting the line power cable, mount the EMC
metal cover to ensure best EMC performance.
NOTE!
The EMC metal cover is only included in units with an RFI
filter.
Figure 3.34 Mount the EMC shield.

3.3.11 AC line input connections

Line power must be connected to terminals 91-1, 92-1,
93-1, 91-2, 92-2 and 93-2 (see Table 3.22). Ground is
connected to the terminal to the right of terminal 93.
Terminal No. Function
91-1, 92-1, 93-1 Line power R1/L1-1, S1/L2-1, T1/
L3-1
91-2, 92-2, 93-2 Line power R2/L1-2, S2/L2-2, T2/
L3-2
94 Ground
Table 3.22
NOTE!
Check the nameplate to ensure that the AC line voltage of
the adjustable frequency drive matches the power supply
of your plant.
Ensure that the power supply can supply the necessary
current to the adjustable frequency drive.
If the unit is without built-in fuses, ensure that the
appropriate fuses have the correct current rating.
3-33
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