Section 2: Installation of the frequency converter
Disconnecting device
In order to comply with EU directives, according to PN-EN 60204-1:2010,
power drive, which consists of a frequency converter and electrical machine,
should be supplied with a device for disconnecting power supply voltage. This
device should be one of listed below:
•
separator (with or without fuses), category of usage AC-23B fulfilling
the requirements EN 60947-3,
•
disconnector (with or without) fuses, disconnecting a load circuit
before opening main contacts, conforming the EN 60947-3
requirements,
•
circuit breaker, in accordance with EN 60947-2.
A user is obliged to fulfil these requirements.
Emergency stop
In order to comply with the European Union Directive, according to PN - EN
60204-1:2010, for the safety of personnel and equipment, it is necessary to
use an emergency stop switch, the operation of which takes precedence over
other functions, irrespective of operating mode. The key STOP on the oper-
ator panel cannot be treated as an emergency stop switch, because it doesn't
disconnect a frequency converter from power supply voltage.
A user is obliged to fulfill this requirement.
Housing
The housing conforms to the requirements of an IP20 protection degree. The
surface, on which the operator's control panel is located, meets the require-
ments of an IP40 protection degree. The housing has been designed so that it
cannot be removed without the use of tools.
Capacitors
discharging
There is a capacitor battery with relatively high capacity in a DC link circuit of
the frequency converter. Despite switching off the power supply voltage of the
converter, dangerous voltage may remain on the terminals for a specified
period of time. It is necessary to wait 5 minutes before switching on the power
strip of the frequency converter. The information about danger of such voltage
is also placed on the terminal block cover.
TWERD Power Electronics
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