Short Circuit Current Rating (Sccr); Connection Tightening Torques - Danfoss VLT AutomationDrive FC 300 Operating Instructions Manual

Specifications
VLT© Model Bussmann PN
N55k T7 170M2616
N75k T7 170M2619
N90k T7 170M2619
N110 T7 170M2619
N132 T7 170M2619
N160 T7 170M4015
N200 T7 170M4015
N250 T7 170M4015
N315 T7 170M4015
Table 10.7 Fuse Options for 525-690 V Frequency Converters
For UL compliance, for units supplied without a contactor-
only option, the Bussmann 170M series fuses must be
used. See Table 10.9 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 Table 10.8:
415 V 480 V
D6h frame 120,000 A 100,000 A
D8h frame 100,000 A 100,000 A
Table 10.8 Frequency Converter Supplied with a Circuit Breaker
If the frequency converter is supplied with a contactor-only
option and is externally fused according to Table 10.9, the
SCCR of the frequency converter is as follows:
415 V 480 V
1)
IEC UL
D6h frame 100,000 A 100,000 A
D8h frame (not 100,000 A 100,000 A
including the
N250T5)
D8h frame 100,000 A Consult
(N250T5 only) factory
Table 10.9 Frequency Converter Supplied with a Contactor
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.
®
VLT Automation Drive D-Frame
Operating Instructions
Siba PN Ferraz-Shawmut European PN
20 610 31.160
20 610 31.315
20 610 31.315
20 610 31.315
20 610 31.315
20 620 31.550
20 620 31.550
20 620 31.550
20 620 31.550
600 V 690 V
65,000 A 70,000 A
42,000 A 30,000 A
600 V 690 V
2) 2) 1)
UL IEC
100,000 A 100,000 A
100,000 A 100,000 A
Not applicable
®
MG34U202 - VLT is a registered Danfoss trademark
6,9URD30D08A0160
6,9URD31D08A0315
6,9URD31D08A0315
6,9URD31D08A0315
6,9URD31D08A0315
6,9URD32D08A0550
6,9URD32D08A0550
6,9URD32D08A0550
6,9URD32D08A0550
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
D1h/D3h Mains
Motor
Load sharing
Regen
Earth (Ground)
Brake
D2h/D4h Mains
Motor
Regen
Load sharing
Earth (ground)
Brake
Table 10.10 Torque for Terminals
Ferraz-Shawmut North American PN
A070URD30KI0160
A070URD31KI0315
A070URD31KI0315
A070URD31KI0315
A070URD31KI0315
A070URD32KI0550
A070URD32KI0550
A070URD32KI0550
A070URD32KI0550
Torque [Nm (in-lbs)] Bolt size
19-40 (168-354) M10
8.5-20.5 (75-181) M8
19-40 (168-354) M10
8.5-20.5 (75-181) M8
10 10
79