Specifications

2 Introduction
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 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. Check that the mains supply has been discon-
nected and that the necessary time has passed
before removing motor and mains plugs.
2. Do not use [Stop/Reset] as a safety switch. It does
not disconnect the unit from mains.
3. In accordance with applicable national and local
regulations:
•
Establish correct protective earth of the
unit
•
Protect the operator against supply
voltage
•
Protect the motor against overload
4. Ensure that the earth 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 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 passed before removing motor and
mains plugs.
7. 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 are
present. Check that all voltage inputs have been
disconnected and that the necessary time has
passed before commencing repair work.
Installation at High Altitudes
WARNING
For installation in altitudes above 3 km (350–500 V), or 2
km (525–690 V), contact Danfoss regarding PELV.
Warning against unintended start
1. The motor can be stopped while connected to
mains in the following ways:
•
digital commands
•
bus commands
•
references
•
local stop
Unintended start can still occur.
2. While parameters are being changed, the motor
could start. Always activate [Stop/Reset] before
modifying data.
3. A stopped motor can restart if the following
conditions occur:
•
A fault in the electronics of the
frequency converter
•
A temporary overload
•
A fault in the supply mains
•
A disruption in the motor connection
Refer to the Operating Instructions for further safety
guidelines.
WARNING
Discharge Time
Frequency converters contain DC-link capacitors that can
remain charged even when the frequency converter is
not powered. To avoid electrical hazards, take the
following precautions:
•
Disconnect AC mains
•
Disconnect any permanent magnet motors
•
Disconnect any remote DC-link power supplies,
including battery backups, UPS, and DC-link
connections to other units
Failure to wait the specified time after power has been
removed before doing service or repair could result in
death or serious injury. See Table 2.1 for discharge times.
Introduction VLT® HVAC Drive FC 102 Design Guide
14 MG16C102 - Rev. 2013-08-20
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