Danfoss VLT Midi Drive FC 280, Operating Manual

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9.7 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) 0.4 (3.5) 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) 0.4 (3.5) 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) 0.4 (3.5) 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) 0.4 (3.5) 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) 0.4 (3.5) 0.5 (4.4)
Table 9.5 Tightening Torques
9.8 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 (first 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 9.6 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 9.6 and Table 9.7 to ensure compliance with UL
508C 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), 240 V/
400 V maximum. The frequency converter short-circuit
current rating (SCCR) is suitable for use on a circuit capable
of delivering not more than 100000 A
rms
, 240 V/480 V
maximum when protected by Class T fuses.
Specifications
VLT
®
Midi Drive FC 280
60 Danfoss A/S © 10/2017 All rights reserved. MG07A402
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