Term. no. 96 97 98 99
U V W
PE
1)
Motor voltage 0–100% of AC line voltage.
3 wires out of motor
U1 V1 W1
PE
1)
Delta-connected
W2 U2 V2 6 wires out of motor
U1 V1 W1
PE
1)
Star-connected U2, V2, W2
U2, V2 and W2 to be interconnected separately.
1)Protected Ground Connection
NOTE!
In motors without phase insulation paper or other in-
sulation reinforcement suitable for operation with volt-
age supply (such as a adjustable frequency drive), fit
a sine-wave filter on the output of the adjustable fre-
quency drive.
3.3.5 Fuses
Branch circuit protection:
In order to protect the installation against electrical and fire hazards, 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 an
internal overcurrent protection that can be used for upstream overload protection (UL applications excluded). See par. 4-18
Current Limit
. 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), 500 V maximum.
Non-UL compliance
If UL/cUL is not to be complied with, we recommend using the following fuses, which will ensure compliance with EN50178:
In case of malfunction, not following the recommendation may result in unnecessary damage to the adjustable frequency drive.
3 How to Install
VLT
®
AutomationDrive FC 300 Instruction
Manual
3-16
MG.33.AG.22 - VLT
®
is a registered Danfoss trademark
3
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