Pelv And Galvanic Isolation Compliance; Storage - Danfoss VLT AQUA Drive FC 202 Design Manual

System Integration
NOTICE!
To ensure interference-free operation of the adjustable
frequency drive/motor system, always use a category C1
RFI filter.
NOTICE!
®
VLT AQUA Drive units are supplied as standard with
built-in RFI filters conforming to category C1 (EN
61800-3) for use with 400 V line power systems and
power ratings up to 90 kW (125 hp) or category C2 for
power ratings of 110 to 630 kW (150 to 850 hp). VLT®
AQUA Drive units conform to C1 with shielded motor
cables up to 50 m (164 ft) or C2 with shielded motor
cables up to 150 m (500 ft). Refer to Table 3.4 for details.
3.1.10 PELV and Galvanic Isolation
Compliance
Ensure the protection against electric shock, when the
electrical supply is of the protective extra-low voltage
(PELV) type and the installation complies with local and
national PELV regulations.
To maintain PELV at the control terminals, all connections
must be PELV, such as thermistors being reinforced/double
insulated. All Danfoss adjustable frequency drive control
and relay terminals comply with PELV (excluding grounded
Delta leg above 400 V).
Galvanic (ensured) 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.
Electrical isolation is provided as shown in Figure 3.1. The
components described comply with both PELV and the
galvanic isolation requirements.
MG20N622
Design Guide
6
1 Power supply (SMPS) including signal isolation of V DC,
indicating the intermediate current voltage
2 Gate drive for the IGBTs
3 Current transducers
4 Opto-coupler, brake module
5 Internal soft-charge, RFI and temperature measurement
circuits.
6 Custom relays
a Galvanic isolation for the 24 V backup option
b Galvanic isolation for the RS485 standard bus interface
Figure 3.1 Galvanic Isolation
Installation at high altitude
Installations exceeding high altitude limits may not comply
with PELV requirements. The isolation between
components and critical parts could be insufficient. There
is a risk for overvoltage. Reduce the risk for overvoltage
using external protective devices or galvanic isolation.
For installations at high altitude, contact Danfoss regarding
PELV compliance.
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3.1.11 Storage

Like all electronic equipment, adjustable frequency drives
must be stored in a dry location. Periodic forming
(capacitor charging) is not necessary during storage.
It is recommended to keep the equipment sealed in its
packaging until installation.
Danfoss A/S © 09/2014 All rights reserved.
5 4 1 2
a b
380–500 V (enclosure A, B and C): above 2000 m
(6500 ft)
380–500 V (enclosure D, E, and F): above 3000 m
(9800 ft)
525–690 V: above 2000 m (6500 ft)
3
M
3
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