Introduction To The Vlt Aqua Drive - Danfoss VLT AQUA Drive Design Manual

VLT ® AQUA Drive Design Guide

2. Introduction to the VLT AQUA Drive

2.1. Safety
2.1.1. Safety note
Safety Regulations
1. The adjustable frequency drive must be disconnected from line power if repair work is to be
carried out. Make sure that the line supply has been disconnected and that the necessary time
has passed before removing motor and line plugs.
2. The [STOP/RESET] key on the control panel of the adjustable frequency drive does not dis-
connect the equipment from line power and is thus not to be used as a safety switch.
3. Correct protective grounding of the equipment must be established, the user must be protected
against supply voltage, and the motor must be protected against overload in accordance with
applicable national and local regulations.
4. The ground leakage currents are higher than 3.5 mA.
5. Protection against motor overload is set by par. 1-90
is desired, set par. 1-90 to data value [ETR trip] (default value) or data value [ETR warning]. Note:
The function is initialized at 1.16 x rated motor current and rated motor frequency. For the North
American market: The ETR functions provide class 20 motor overload protection in accordance
with NEC.
6. Do not remove the plugs for the motor and line supply while the adjustable frequency drive is
connected to line power. Make sure that the line supply has been disconnected and that the
necessary time has passed before removing motor and line plugs.
7. Please note that the adjustable frequency drive has more voltage inputs than L1, L2 and L3
when load sharing (linking of DC intermediate circuit) and external 24 V DC have been installed.
Make sure that all voltage inputs have been disconnected and that the necessary time has passed
before commencing repair work.
Installation at High Altitudes
Warning against Unintended Start
1. The motor can be brought to a stop by means of digital commands, bus commands, references
or a local stop while the adjustable frequency drive is connected to line power. If personal safety
considerations make it necessary to ensure that no unintended start occurs, these stop functions
are not sufficient. 2. While parameters are being changed, the motor may start. Consequently,
the stop key [STOP/RESET] must always be activated, following which data can be modified. 3.
A motor that has been stopped may start if faults occur in the electronics of the adjustable fre-
The voltage of the adjustable frequency drive is dangerous whenever connected to
line power. Incorrect installation of the motor, adjustable frequency drive or serial
communication bus may cause damage to the equipment, serious personal injury or
death. Consequently, the instructions in this manual, as well as national and local
rules and safety regulations, must be followed.
At altitudes higher than 6,600 feet [2 km], please contact Danfoss Drives regarding
PELV.
MG.20.N2.22 - VLT ® is a registered Danfoss trademark.
2. Introduction to the VLT AQUA Drive
Motor Thermal Protection . If this function
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