Connection Of Mains; External Fan Supply; Fuses - Danfoss vlt series Operating Instructions Manual

How to Install

3.4.11 Connection of Mains

Mains and ground must be connected as detailed in
Table 3.14.
3 3
Terminal number
91-1, 92-1, 93-1
91-2, 92-2, 93-2
94
Table 3.14 Mains and Ground Connection Terminals
NOTICE
To ensure that the mains voltage of the frequency
converter matches the supply of the plant, check the
nameplate.
Ensure that the power supply can supply the necessary
current to the frequency converter.
If the frequency converter is without built-in fuses, ensure
that the external fuses have the correct current rating. See
chapter 3.4.13 Fuses.

3.4.12 External Fan Supply

In case the frequency converter is supplied by DC, or if the
fan must run independently of the power supply, an
external power supply can be applied. The connection is
made on the power card.
Terminal
number
100, 101
102, 103
Table 3.15 External Fan Supply Terminals
The connector on the power card provides the connection
of mains voltage for the cooling fans. The fans are
connected from factory to be supplied from a common AC
line (jumpers between 100–102 and 101–103). If an
external supply is needed, remove the jumpers and
connect the supply to terminals 100 and 101. Use a 5 A
fuse for protection. UL applications require a LittleFuse
KLK-5 or equivalent.
48
VLT
Function
Mains R1/L1-1, S1/L2-1, T1/L3-1
Mains R2/L1-2, S2/L2-2, T2/L3-2
Ground
Function
Auxiliary supply S, T
Internal supply S, T
Danfoss A/S © 04/2016 All rights reserved.
®
AutomationDrive FC 302

3.4.13 Fuses

WARNING
SHORT-CIRCUIT AND OVERCURRENT
All frequency converters must have the mains fuses for
the short circuit and overcurrent protection. If they are
not included in the frequency converter, they must be
installed during frequency converter installation.
Operating frequency converters without having mains
fuses can result in death or serious injury.
•
Install the mains fuses for the short circuit and
overcurrent protection during the installation, if
they are not included in the frequency
converter.
Branch circuit protection
To protect the installation against electrical and fire hazard,
all branch circuits in an installation, switch gear, machines
and so on, must be short-circuited and overcurrent
protected according to national/international regulations.
Short-circuit protection
To avoid electrical or fire hazard, protect the frequency
converter against short circuit. Danfoss recommends using
the fuses mentioned in Table 3.16 to Table 3.27 to protect
service personnel and equipment if there is an internal
failure in the frequency converter. The frequency converter
provides full short-circuit protection if there is a short
circuit on the motor output.
Overcurrent protection
To avoid fire hazard due to overheating of the cables in
the installation, provide overload protection. The frequency
converter is equipped with an internal overcurrent
protection, which can be used for upstream overload
protection (UL applications excluded). See
parameter 4-18 Current Limit. Moreover, fuses or circuit
breakers can be used to provide the overcurrent protection
in the installation. Overcurrent protection must always be
carried out according to national regulations.
UL Compliance
The fuses listed in Table 3.16 to Table 3.27 are suitable for
use on a circuit capable of delivering 100000 A
(symmetrical), 240 V (if applicable), 480 V, 500 V, or 600 V
depending on the frequency converter voltage rating. With
the proper fusing, the frequency converter short circuit
current rating (SCCR) is 100000 A
When the circuit breaker is provided with the frequency
converter, the circuit breaker's ampere interrupting current
rating (AIC), which is usually lower than 100000 A
determines the frequency converter SCCR.
rms
.
rms
,
rms
MG34Q402