Introduction; Safety; Safety Note - Danfoss VLT HVAC Drive FC 102 Design Manual

Introduction

2 Introduction
2 2

2.1 Safety

2.1.1 Safety Note

WARNING
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 could damage the units or
cause serious personal injury or death. The instructions
in this manual, as well as national and local rules and
safety regulations, must be complied with.
Safety Regulations
1. Make sure that the line power supply has been
disconnected and that the necessary time has
passed before removing motor and line power
plugs.
2. Do not use [Stop/Reset] as a safety switch. It does
not disconnect the unit from line power.
3. In accordance with applicable national and local
regulations:
4. Ensure that the ground leakage currents are
higher than 3.5 mA.
5. Protection against motor overload comes from
1-90 Motor Thermal Protection. If this function is
desired, set 1-90 Motor Thermal Protection to data
value [4] ETR trip (default value) or data value [3]
ETR warning.
NOTICE!
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.
14
•
Establish correct protective ground of
the unit
•
Protect the operator against supply
voltage
•
Protect the motor against overload
Danfoss A/S © Rev. 2014-01-13 All rights reserved.
Design Guide
6.
7.
Installation at High Altitudes
WARNING
For installation in altitudes above 10,000 ft [3 km] (350–
500 V), or 6,600 feet [2 km] (525–690 V), contact Danfoss
regarding PELV.
Warning against unintended start
1.
2.
3.
Refer to the instruction manual for further safety
guidelines.
Do not remove the plugs for the motor and line
power supply while the adjustable frequency
drive is connected to line power. Make sure that
the line power supply has been disconnected and
that the necessary time has passed before
removing motor and line power plugs.
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 are present. Make sure that all voltage
inputs have been disconnected and that the
necessary time has passed before commencing
repair work.
The motor can be stopped while connected to
line power in the following ways:
•
digital commands
•
bus commands
•
references
•
local stop
Unintended start can still occur.
While parameters are being changed, the motor
could start. Always activate [Stop/Reset] before
modifying data.
A stopped motor can restart if the following
conditions occur:
•
A fault in the electronics of the
adjustable frequency drive
•
A temporary overload
•
A fault in the supply line power
•
A disruption in the motor connection
MG16C122