Galvanic Isolation (Pelv) - Danfoss VLT DriveMotor FCP 106 Design Manual

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2.8 Galvanic Isolation (PELV)

PELV offers protection by way of extra low voltage.
2 2
Protection against electric shock is ensured when the
electrical supply is of the PELV type and the installation is
made as described in local/national regulations on PELV
supplies.
All control terminals and relay terminals 01-03/04-06
comply with PELV (protective extra low voltage) (does not
apply to grounded delta leg above 300 V).
Galvanic (ensured) isolation is obtained by fulfilling
requirements for higher isolation and by providing the
relevant creapage/clearance distances. These requirements
are described in the EN/IEC 61800-5-1 standard.
The components that make up the electrical isolation also
comply with the requirements for higher isolation and the
relevant test as described in EN/IEC 61800-5-1.
The PELV galvanic isolation is shown in Illustration 2.25.
To maintain PELV, all connections made to the control
terminals must meet the requirements for PELV.
2
+24 V
18
Functional
isolation
RS485
Relay
output
1 High-voltage circuit
2 I/O control card
3 Custom relays
Illustration 2.25 Galvanic Isolation
NOTICE
HIGH ALTITUDE
For installation at altitudes above 2000 m (6562 ft),
contact Danfoss hotline regarding clearance (PELV).
26
PELV isolation
1
Control
High
voltage
3
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VLT DriveMotor FCP 106
Mains
Motor
DC bus
Thermistor
input
MG03M302