Danfoss VLT AutomationDrive FC 300 Design Manual page 42

3. Introduction to FC 300
FC 301/FC 302; 200-240 V, 380-500 V
Basic standard
Acceptance criterion
Line
Motor
Brake
Load sharing
3
Control wires
Standard bus
Relay wires
Application and Fieldbus op-
tions
LCP cable
External 24 V DC
Enclosure
AD: Air Discharge
CD: Contact Discharge
CM: Common mode
DM: Differential mode
1. Injection on cable shield.
Table 3.2: Immunity continued
PELV offers protection by way of extra low voltage. 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 525-600 V units and at grounded Delta leg above 300 V).
Galvanic (ensured) isolation is obtained by fulfilling requirements for higher isolation and by pro-
viding the relevant creapage/clearance distances. These requirements are described in the EN
61800-5-1 standard.
The components that make up the electrical isolation, as described below, also comply with the
requirements for higher isolation and the relevant test as described in EN 61800-5-1.
The PELV galvanic isolation can be shown in six locations (see illustration):
In order to maintain PELV all connections made to the control terminals must be PELV, e.g. ther-
mistor must be reinforced/double insulated.
1.
2.
3.
4.
5.
6.
The functional galvanic isolation (a and b on drawing) is for the 24 V back-up option and for the
RS 485 standard bus interface.
42
Burst
IEC 61000-4-4
B
4 kV CM
4 kV CM
4 kV CM
4 kV CM
2 kV CM
2 kV CM
2 kV CM
2 kV CM
2 kV CM
2 kV CM
—
Power supply (SMPS) incl. signal iso-
lation of U , indicating the inter-
DC
mediate current voltage.
Gate drive that runs the IGBTs (trig-
ger transformers/opto-couplers).
Current transducers.
Opto-coupler, brake module.
Internal inrush, RFI, and tempera-
ture measurement circuits.
Custom relays.
MG.33.B9.02 - VLT
Surge ESD Radiated electromagnetic
IEC 61000-4-5 IEC
61000-4-2 IEC 61000-4-3
B B
2 kV/2 Ω DM
—
4 kV/12 Ω CM
4 kV/2 Ω 1) —
4 kV/2 Ω 1) —
4 kV/2 Ω 1) —
2 kV/2 Ω 1) —
1) —
2 kV/2 Ω
1) —
2 kV/2 Ω
2 kV/2 Ω 1) —
1) —
2 kV/2 Ω
0.5 kV/2 Ω DM
—
1 kV/12 Ω CM
8 kV AD
—
6 kV CD
Illustration 3.3: Galvanic isolation
® is a registered Danfoss trademark
FC 300 Design Guide
RF common
field mode voltage
IEC 61000-4-6
A A
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
— 10 V
RMS
10 V/m —