Specifications

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Introduction to VLT

HVAC Drive

2.1 Safety

2.1.1 Safety Note

WARNING

The voltage of the frequency converter is dangerous

whenever connected to mains. Incorrect installation of

the motor, frequency converter or fieldbus may cause

death, serious personal injury or damage to the

equipment. Consequently, the instructions in this

manual, as well as national and local rules and safety

regulations, must be complied with.

Safety Regulations

1. Disconnect the frequency converter from mains, if

repair work is to be carried out. Check that the

mains supply has been disconnected and that the

necessary time has elapsed before removing

motor and mains plugs.

2. The [Stop/Reset] key on the LCP of the frequency

converter does not disconnect the equipment

from mains and is thus not to be used as a safety

switch.

3. Established correct protective earthing of the

equipment, protect the user against supply

voltage, and protect the motor against overload

in accordance with applicable national and local

regulations.

4. The earth leakage currents are higher than 3.5

mA.

5. Protection against motor overload is set by

1-90 Motor Thermal Protection. If this function is

desired, set 1-90 Motor Thermal Protection to data

value [ETR trip] (default value) or data value [ETR

warning]. Note: The function is initialised 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

mains supply while the frequency converter is

connected to mains. Check that the mains supply

has been disconnected and that the necessary

time has elapsed before removing motor and

mains plugs.

7. Note that the frequency converter 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. Check that

all voltage inputs have been disconnected and

that the necessary time has passed before

commencing repair work.

Installation at high altitudes

CAUTION

380-500 V, enclosure types A, B and C: At altitudes

above 2 km, contact Danfoss regarding PELV.

525-690 V: At altitudes above 2 km, contact Danfoss

regarding PELV.

WARNING

Warning against unintended start

1. The motor can be stopped with digital

commands, bus commands, references or a

local stop, while the frequency converter is

connected to mains. If personal safety consider-

ations 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 [Reset] key 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 frequency

converter, or if a temporary overload or a fault

in the supply mains or the motor connection

ceases.

WARNING

Touching the electrical parts may be fatal - even after

the equipment has been disconnected from mains.

Also make sure that other voltage inputs have been

disconnected, such as external 24 V DC, load sharing

(linkage of DC intermediate circuit), as well as the motor

connection for kinetic back-up. Refer to the Operating

Instructions for further safety guidelines.

2.1.2

Caution

WARNING

The DC link capacitors remain charged after power has

been disconnected. To avoid an electrical shock hazard,

disconnect the from the mains before carrying out

maintenance. Wait at least as follows before doing

service on the frequency converter:

Introduction to VLT® HVAC D... Design Guide

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