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EMC and Harmonics
9.12 Galvanic Isolation
NOTICE
INSTALLATION AT HIGH ALTITUDE
When installing 380–500 V units above 3000 m (9843 ft), contact Danfoss regarding PELV.
When installing 525–690 V units above 2000 m (6562 ft), contact Danfoss regarding PELV.
Protection against electric shock is ensured when the electrical supply is of the PELV type, and the installation complies with
local/national regulations on PELV supplies.
All control terminals and relay terminals 01-03/04-06 comply with PELV. This does not apply to grounded Delta leg above
400 V. Galvanic isolation is obtained by fulfilling requirements for higher isolation and by providing the relevant creepage/
clearance distances. These requirements are described in the EN 61800-5-1 standard.
To maintain PELV, all connections made to the control terminals must be PELV. The components that make up the electrical
isolation also comply with the requirements for higher isolation and the relevant test as described in EN 61800-5-1.
The PELV galvanic isolation is shown in Illustration 9.14.
9
9
1
Current transducers
2
Motor
3
Custom relays
4
Internal inrush, RFI, and temperature measurement circuits
5
Optocoupler, brake module
Illustration 9.14 Galvanic Isolation
104
®
VLT
3
4
5
8
9
Danfoss A/S © 6/2016 All rights reserved.
Parallel Drive Modules
6
7
10
6
Supply (SMPS) including signal isolation of U
intermediate current voltage
7
Gate drive that runs the IGBTs (trigger transformers/opto-
couplers)
8
STO supply
9
24 V back-up
10
RS485 standard bus interface
1
2
, indicating the
DC
MG37N102
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