3.6.12 External Fan Supply
If the adjustable frequency drive is supplied by DC or if the fan must run independently of the power supply, an external power supply can be applied.
The connection is made on the power card.
Terminal No.
Function
100, 101
102, 103
Auxiliary supply S, T
Internal supply S, T
The connector located on the power card provides the AC line voltage connection for the cooling fans. The fans are factory-equipped to be supplied from
a common AC line (jumpers between 100-102 and 101-103). If an external supply is needed, the jumpers are removed and the supply is connected to
terminals 100 and 101. A 5 Amp fuse should be used for protection. In UL applications, this should be a LittleFuse KLK-5 or equivalent.
3.6.13 Fuses
Branch circuit protection:
In order to protect the installation against electrical and fire hazard, all branch circuits in an installation, switch gear, machines, etc., must be short-
circuited and overcurrent protected according to national/international regulations.
Short-circuit protection:
The adjustable frequency drive must be protected against short circuit in order to prevent electrical or fire hazard. Danfoss recommends using the fuses
mentioned below to protect service personnel and equipment in case of an internal failure in the drive. The adjustable frequency drive provides full short-
circuit protection in case of a short-circuit on the motor output.
Overcurrent protection
Provide overload protection to avoid fire hazard due to overheating of the cables in the installation. The adjustable frequency drive is equipped with
internal overcurrent protection that can be used for upstream overload protection (UL applications excluded). See par. 4-18. Moreover, fuses or circuit
breakers can be used to provide the overcurrent protection in the installation. Overcurrent protection must always be carried out according to national
regulations.
Fuses must be designed for protection in a circuit capable of supplying a maximum of 100,000 A
rms
(symmetrical).
Fuse Tables - High Power
Size/
Type
Bussmann
E1958
JFHR2**
Bussmann
E4273
T/JDDZ**
SIBA
E180276
RKI/JDDZ
LittelFuse
E71611
JFHR2**
Ferraz-
Shawmut
E60314
JFHR2**
Bussmann
E4274
H/JDDZ**
Bussmann
E125085
JFHR2*
Internal
Option
Bussmann
P90K
FWH-
300
JJS-
300
2028220-
315
L50S-300
A50-P300
NOS-
300
170M3017
170M3018
P110
FWH-
350
JJS-
350
2028220-
315
L50S-350
A50-P350
NOS-
350
170M3018
170M3018
P132
FWH-
400
JJS-
400
206xx32-
400
L50S-400
A50-P400
NOS-
400
170M4012
170M4016
P160
FWH-
500
JJS-
500
206xx32-
500
L50S-500
A50-P500
NOS-
500
170M4014
170M4016
P200
FWH-
600
JJS-
600
206xx32-
600
L50S-600
A50-P600
NOS-
600
170M4016
170M4016
Table 3.4: D enclosures, 380-500 V
*170M fuses from Bussmann shown use the -/80 visual indicator, -TN/80 Type T, -/110 or TN/110 Type T indicator fuses of the same size and amperage
may be substituted for external use
**Any minimum 500 V UL listed fuse with associated current rating may be used to meet UL requirements.
VLT
®
Automation Drive FC 300
Instruction Manual High Power
3 How to Install
MG.33.U2.22 - VLT
®
is a registered Danfoss trademark
3-51
3
