Chapter: H.1. Conditions of safe operations
H.1. Conditions of safe operations
Before starting any work with the MFC1000 frequency converter read carefully this User manual.
This User manual contains notices intended to ensure personal safety, as well as to protect the MFC1000
frequency converter and connected equipment against damage.
Ignorance or not knowing of the information contained in It can cause physical injury or death!
It can also cause damage to the MFC1000 frequency converter and connected equipment!
In the further part of this User manual, the MFC1000 frequency converter, to which this instruction applies,
will be also referred to as the “drive” or “converter”.
H.1.1. Warnings
Incorrect installation, usage, and maintenance of the drive can cause physical injury or death, or
damage to the drive and connected equipment!
R I S K O F E L E C T R I C
S H O C K!
The drive contains high voltage when connected to mains voltage!
Dangerous voltage present inside the device for at least 10 minutes after disconnecting the power
supply!
•
Installation, usage, and maintenance of the drive must be performed only by qualified personnel.
•
Don’t make any connections changes when the drive is connected to the power supply.
•
Before switching on the main power supply and control circuit voltage make sure the drive has been
correctly installed and all housing elements have been properly assembled.
•
It is forbidden to touch the drive's voltage terminals if it is connected to the power supply.
•
After connecting the drive to the supply voltage, its internal components (without the control terminals)
are on the power supply potential. Touching these components can cause an electric shock.
•
When the drive is connected to the supply voltage, dangerous voltage appears at its output terminals U,
V, W even when the electric motor is not running.
•
Externally supplied control circuits may carry dangerous voltage even when the input power of the drive
is switched off.
•
After disconnecting the drive from the supply voltage, dangerous voltages still remain inside the drive
due to the energy stored in the power circuit capacitors (DC-link circuit). It can cause an electric shock!
The time required for self-discharge of capacitors in an undamaged drive is usually between 5÷15
minutes (a higher power rating of the drive means the longer time).
For this reason before starting any works on the drive, the electric motor or the electric motor cable
always wait at least 10 minutes after disconnecting all power supplies sources and make sure that a
voltage on a clamps is not present.
Attention! The lack of the voltage at the connection terminals does not ensure the lack of
dangerous voltage in the internal DC-link circuit of the drive!
•
The drive is not adapted for use in flammable or explosive environment because it can cause fire or
explosion. Use suitable flameproof enclosures.
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MFC1000AcR, TWERD Power Electronics