Danfoss VLT Midi Drive FC 280 Operating Instructions

9.7 Connection Tightening Torques
Make sure to use the right torques when tightening all electrical connections. Too low or too high torque may cause
electrical connection problems. Use a torque wrench to ensure that correct torques are applied.
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) 3 (26.6) 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) 3 (26.6) 0.5 (4.4)
K3 7.5 (10) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 0.8 (7.1) 3 (26.6) 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 9.3 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 (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
The recommendations do not cover branch circuit
protection for UL.
Table 9.4 lists the recommended fuses and circuit breakers
that have been tested.
WARNING
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
Using fuses and/or circuit breakers is mandatory to
ensure compliance with IEC 60364 for CE.
Danfoss recommends using the fuses and circuit breakers
in Table 9.4 on a circuit capable of delivering 5000 A
rms
(symmetrical), 380–480 V depending on the frequency
converter voltage rating. With the proper fuses and/or
circuit breakers, the frequency converter short-circuit
current rating (SCCR) is 5000 A
rms
.
Enclosure
size
Power [kW
(hp)]
CE compliance
fuse
LVD circuit breaker
K1
0.37–2.2 (0.5–
3.0)
gG-20 PKZM0-16
K2
3.0–5.5 (4.0–
7.5)
gG-25 PKZM0-20
K3 7.5 (10) gG-25 PKZM0-25
K4 11–15 (15–
20)
gG-50 –
K5
18.5–22 (25–
30)
gG-80 –
Table 9.4 CE Fuse, 380–480 V
Specications
VLT
®
Midi Drive FC 280
52 Danfoss A/S © 11/2015 All rights reserved. MG07A102
99

Danfoss VLT Midi Drive FC 280 Specifications

General

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