5 Electrical Installation
5.1 Safety Instructions
See
for general safety instructions.
WARNING
INDUCED VOLTAGE
Induced voltage from output motor cables from different
drives that run together can charge equipment
capacitors even with the equipment turned off and
locked out. Failure to run output motor cables separately
or use shielded cables or metal conduits could result in
death or serious injury.
•
Run output motor cables separately or use
shielded cables.
•
Simultaneously lock out all the drives.
WARNING
SHOCK HAZARD
The drive can cause a DC current in the ground
conductor and thus result in death or serious injury.
•
When a residual current-operated protective
device (RCD) is used for protection against
electrical shock, only an RCD of Type B is
allowed on the supply side.
Failure to follow the recommendation means that the
RCD cannot provide the intended protection.
NOTICE
The drive is supplied with Class 20 motor overload
protection.
Overcurrent protection
•
Additional protective equipment such as short-
circuit protection or motor thermal protection
between drive and motor is required for
applications with multiple motors.
•
Input fusing is required to provide short circuit
and overcurrent protection. If fuses are not
factory-supplied, the installer must provide them.
See maximum fuse ratings in
Wire type and ratings
•
All wiring must comply with local and national
regulations regarding cross-section and ambient
temperature requirements.
•
Power connection wire recommendation:
Minimum 75
°
C (167
°
F) rated copper wire.
See
chapter 9.5.1 Cable Specifications
for recommended
wire sizes and types.
CAUTION
PROPERTY DAMAGE
Protection against motor overload is not included in the
default setting. To add this function, set
parameter 1-90 Motor Thermal Protection
to
[ETR trip]
or
[ETR warning]
. For the North American market, the ETR
function provides class 20 motor overload protection in
accordance with NEC. Failure to set
parameter 1-90 Motor
Thermal Protection
to
[ETR trip]
or
[ETR warning]
means
that motor overload protection is not provided and, if
the motor overheats, property damage can occur.
5.2 EMC-compliant Installation
To obtain an EMC-compliant installation, follow the
instructions provided in:
•
•
Chapter 5.4 Connecting the Motor
.
•
Chapter 5.6 Connecting to Ground
•
.
NOTICE
TWISTED SHIELD ENDS (PIGTAILS)
Twisted shield ends (pigtails) increase the shield
impedance at higher frequencies, reducing the shield
effect and increasing the leakage current. Avoid twisted
shield ends by using integrated shield clamps.
•
For use with relays, control cables, a signal
interface, fieldbus, or brake, connect the shield to
the enclosure at both ends. If the ground path
has high impedance, is noisy, or is carrying
current, break the shield connection on 1 end to
avoid ground current loops.
•
Convey the currents back to the unit using a
metal mounting plate. Ensure good electrical
contact from the mounting plate through the
mounting screws to the drive chassis.
•
Use shielded cables for motor output cables. An
alternative is unshielded motor cables within
metal conduit.
Electrical Installation
VLT® Refrigeration Drive FC 103
22
Danfoss A/S © 04/2018 All rights reserved.
MG16P222
5
5
Содержание VLT FC 103
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