Safety Instructions And General Warning; Safety Regulations Afe 302; Disposal Instruction; High Voltage Warning - Danfoss VLT Active Front End AFE 302 Operating Instructions Manual

Safety Instructions and Gen...

2 Safety Instructions and General Warning

2 2

2.1 Safety Regulations AFE 302

2.1.1 Disposal Instruction

2.1.2 High Voltage Warning

WARNING
The voltage of the AFE 302 is dangerous whenever the
frequency converter is connected to mains. Incorrect
installation or operation of the frequency converter may
cause damage to the equipment, serious personal injury
or death. The instructions in this manual must
consequently be observed, as well as applicable local
and national rules and safety regulations.
WARNING
Installation in high altitudes
At altitudes above 2,000 m, contact Danfoss regarding
PELV.

2.1.3 Safety Instructions

•
Make sure that the AFE 302 is properly connected
to earth.
•
Protect users against supply voltage.
•
Remember that the [Off] key on LCP is not a
safety switch. Pressing the [Off] key does not
disconnect the AFE 302 from the mains.

2.1.4 General Warnings

WARNING
Touching the electrical parts may be fatal even after the
equipment is disconnected from the mains.
Before carrying out the maintenance, the frequency
converter must be disconnected from the mains. It will
avoid the electrical shock hazard.
Check the discharge time on the nameplate for the exact
waiting period. Otherwise wait at least 40 min.
6
Operating Instructions
Equipment containing electrical components
may not be disposed with domestic waste.
It must be separately collected with Electrical
and Electronic waste according to local and
currently valid legislation.
Danfoss A/S © Rev. 05/2014 All rights reserved.
WARNING
When the AFE is on, the earth current from the AFE 302
frequency converter will exceed 3.5 mA. The earth cable
must have a good contact to the earth terminal 95. The
earth connection is done with the two separate cables.
The size of each cable needs to be a half of the mains
cable size in minimum.

2.1.5 Before Commencing Repair Work

1. Switch off the entire system.
2. Wait until the DC-link capacitor is discharged
fully. See period of time on the warning label.
3. Disconnect DC bus terminals 88 and 89.
4. Disconnect the soft charge supply connector from
the soft charge board.
CAUTION
The source of the MDCIC connector (MK105) is the AC
voltage from the front end of the LCL filter. Make sure to
switch off the mains switch.
CAUTION
The source of the fan voltage is from an external 400 V.
Make sure to switch off the external fan voltage source
switch.

2.1.6 System Description

NOTICE
The grounded Delta mains are not used.
An Active Front End (AFE) is sometimes called an active
rectifier, in comparison with a passive rectifier such as the
diode bridge. The AFE consists of LCL filter and the
inverter unit.
The AFE main features are as follows:
•
sinusoidal input current and low harmonic
distortion in the mains
•
unity power factor
•
both rectifying and regenerating operation
•
constant regulated DC voltage
Illustration 2.1 shows the AFE system example.
At start-up, the AFE must detect the mains frequency and
phase to synchronize the operation.
MG33X402