For UL compliance, for units supplied without a contactor-
only option, the Bussmann 170M series fuses must be
used. See
for SCCR ratings and UL fuse criteria if
a contactor-only option is supplied with the frequency
converter.
10.3.3 Short Circuit Current Rating (SCCR)
If the frequency converter is not supplied with a mains
disconnect, contactor or circuit breaker, the Short Circuit
Current Rating (SCCR) of the frequency converters is
100,000 amps at all voltages (380–690 V).
If the frequency converter is supplied with a mains
disconnect, the SCCR of the frequency converter is 100,000
amps at all voltages (380–690 V).
If the frequency converter is supplied with a circuit
breaker, the SCCR depends on the voltage, see
:
415 V
480 V
600 V
690 V
D6h frame
100,000 A
100,000 A
65,000 A
70,000 A
D8h frame
100,000 A
100,000 A
42,000 A
30,000 A
Table 10.8
If the frequency converter is supplied with a contactor-only
option and is externally fused according to
, the
SCCR of the frequency converter is as follows:
415 V
IEC
1)
480 V
UL
2)
600 V
UL
2)
690 V
IEC
1)
D6h frame
100,000 A 100,000 A
100,000 A 100,000 A
D8h frame (not
including the
N315T4)
100,000 A 100,000 A
100,000 A 100,000 A
D8h frame
(N315T4 only)
100,000 A Consult
factory
Not applicable
Table 10.9
1)
With a Bussmann type LPJ-SP or Gould Shawmut type AJT fuse.
450 A max fuse size for D6h and 900 A max fuse size for D8h.
2)
Must use Class J or L branch fuses for UL approval. 450 A max fuse
size for D6h and 600 A max fuse size for D8h.
10.3.4 Connection Tightening Torques
When tightening all electrical connections it is very
important to tighten with the correct torque. Too low or
too high torque results in a bad electrical connection. Use
a torque wrench to ensure correct torque. Always use a
torque wrench to tighten the bolts.
Frame Size
Terminal
Torque
Bolt size
D1h/D3h/D5h/
D6h
Mains
Motor
Load sharing
Regen
19-40 Nm
(168-354 in-
lbs)
M10
Earth (Ground)
Brake
8.5-20.5 Nm
(75-181 in-lbs)
M8
D2h/D4h/D7h/
D8h
Mains
Motor
Regen
Load sharing
Earth (ground)
19-40 Nm
(168-354 in-
lbs)
M10
Brake
8.5-20.5 Nm
(75-181 in-lbs)
M8
Table 10.10 Torque for Terminals
Specifications
VLT
®
AQUA Drive D-Frame
Operating Instructions
MG21A202 - VLT
®
is a registered Danfoss trademark
79
10
10
