4.3.4 Mains Torque
tabulates the tightening torque values for the
mains and DC bus terminals.
Enclosure
Terminal
Torque Value
Bolt size
E, F
Mains,
DC bus
19 Nm (168 in-
lbs)
M10
Table 4.2 Torque Values for Mains and DC Bus Terminals
4.3.5 Mains Connection
The mains cables must be connected at the terminals 91,
92 and 93. The ground cable is connected at the terminal
94.
Terminal No.
Function
91, 92, 93
94
Mains R/L1, S/L2, T/L3
Ground
Table 4.3 Mains Connection
Power (3x525-690 V
AC)
Max. Cable Size (mm
2
(AWG))
P400-P560
4x240 (4x500 MCM)
P630-P800
8x150 (8x300 MCM)
P900-P1M2
12x150 (12x300 MCM)
P1M4-P1M6
16x150 (16x300 MCM)
Table 4.4 Mains Cable Size
NOTICE
Check the name plate to ensure that the mains voltage
of the AFE matches the power supply of the crane.
Ensure that the power supply can supply the necessary
current to the frequency converter.
Ensure that the fuses have the correct current and voltage
rating.
4.3.6 Screened Cables
WARNING
Danfoss recommends using screened cables between the
LCL filter and the frequency converter. Unshielded cables
can be used between transformer and LCL filter input
side.
It is important that screened and armoured cables are
connected in a proper way to ensure the high EMC
immunity and low emissions.
The connection can be made using either cable glands
or clamps
•
EMC cable glands: Generally, available cable
glands can be used to ensure an optimum EMC
connection.
•
EMC cable clamp: Clamps allowing easy
connection are supplied with the frequency
converter.
4.3.7 Fuses
It is recommended to use fuses and/or circuit breakers on
the supply side as protection in case of component break-
down inside the frequency converter (first fault).
NOTICE
This is mandatory to ensure compliance with IEC 60364
for CE or NEC 2009 for UL.
WARNING
Protect personnel and property against the consequence
of component break-down internally 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
etc., must be protected against short-circuit and
overcurrent according to national/international regulations.
NOTICE
The recommendations do not cover branch circuit
protection for UL.
Short-circuit protection
Danfoss recommends using the fuses/circuit breakers
mentioned below to protect service personnel and
property in case of component break-down in the
frequency converter.
Overcurrent protection
The frequency converter provides overload protection to
limit threats to human life, property damage and to avoid
fire hazard due to overheating of the cables in the instal-
lation. The frequency converter is equipped with an
internal overcurrent protection (
) that can be used for upstream overload protection
(UL-applications excluded). 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.
The following tables list the recommended rated current.
Recommended fuses are of the type gG for small to
medium power sizes. For larger powers, aR fuses are
recommended. Circuit breakers must be used, provided
they meet the national/international regulations and they
How to Install
Operating Instructions
MG33X402
Danfoss A/S © Rev. 05/2014 All rights reserved.
33
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Содержание VLT Active Front End AFE 302
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