Danfoss VLT Midi Drive FC 280 Design Guide

7.7 Connection Tightening Torques
Make sure to use the right torques when tightening all electrical connections. Too low or too high torque sometimes causes
electrical connection problems. To ensure that correct torques are applied, use a torque wrench. Recommended slot
screwdriver type is SZS 0.6x3.5 mm.
Torque [Nm (in-lb)]
Enclosure
type
Power [kW (hp)]
Mains Motor DC connection Brake Ground Control/relay
K1 0.37–2.2 (0.5–3.0) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 1.6 (14.2) 0.5 (4.4)
K2 3.0–5.5 (4.0–7.5) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 1.6 (14.2) 0.5 (4.4)
K3 7.5 (10) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 1.6 (14.2) 0.5 (4.4)
K4 11–15 (15–20) 1.2 (10.6) 1.2 (10.6) 1.2 (10.6) 1.2 (10.6) 1.6 (14.2) 0.5 (4.4)
K5 18.5–22 (25–30) 1.2 (10.6) 1.2 (10.6) 1.2 (10.6) 1.2 (10.6) 1.6 (14.2) 0.5 (4.4)
Table 7.3 Tightening Torques
7.8 Fuses and Circuit Breakers
Use fuses and/or circuit breakers on the supply side to
protect service personnel and equipment from injuries and
damage if there is component breakdown inside the
frequency converter (rst fault).
Branch circuit protection
Protect all branch circuits in an installation (including
switch gear and machines) against short circuit and
overcurrent according to national/international regulations.
NOTICE
Integral solid-state short-circuit protection does not
provide branch circuit protection. Provide branch circuit
protection in accordance with the national and local
rules and regulations.
Table 7.4 lists the recommended fuses and circuit breakers
that have been tested.
CAUTION
PERSONAL INJURY AND EQUIPMENT DAMAGE RISK
Malfunction or failing to follow the recommendations
may result in personal risk, and damage to the frequency
converter and other equipment.
•
Select fuses according to recommendations.
Possible damage can be limited to be inside the
frequency converter.
NOTICE
EQUIPMENT DAMAGE
Using fuses and/or circuit breakers is mandatory to
ensure compliance with IEC 60364 for CE. Failure to
follow the protection recommendations can result in
damage to the frequency converter.
Danfoss recommends using the fuses and circuit breakers
in Table 7.4 to ensure compliance with UL or IEC 61800-5-1.
For non-UL applications, design circuit breakers for
protection in a circuit capable of delivering a maximum of
50000 A
rms
(symmetrical), 400 V. The frequency converter
short-circuit current rating (SCCR) is suitable for use on a
circuit capable of delivering not more than 100000 A
rms
,
480 V maximum when protected by T-Class fuses.
Specications Design Guide
MG07B102 Danfoss A/S © 03/2016 All rights reserved. 81
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Danfoss VLT Midi Drive FC 280 Specifications

General

Brand	Danfoss
Model	VLT Midi Drive FC 280
Category	DC Drives
Language	English