Power Wiring
ANCA Motion
DS619-0-00-0019 - Rev 0
37
6
6.3.11
Supply Voltage Ranges
The supply voltage range must be within the limits specified in
Section 12.4 Electrical Specifications
Mains supply voltage an frequency limits
Drive input single phase voltage range
U
L1-L2
90-265V AC
Drive input three phase voltage range
U
L1-L2-L2
90-265V AC
Maximum input voltage to Protective Earth
U
L1,L2,L3,-PE
265V AC
Nominal Input frequency
ƒ
LN
50/60Hz
Operation at reduced supply voltage will require power de-rating as discussed in
12.9 Effect of AC Input Voltage
on DC Bus Ripple
Operation at single phase (and two phases) supplies instead of three phase supplies may also require the
addition of more DC bus capacitors or power de-rating as discussed in
Section 12.9 Effect of AC Input Voltage
on DC Bus Ripple.
The addition of external DC bus capacitors also reduces the drive susceptibility to tripping
from voltage supply dips.
6.3.12
Connection of drives to grounded systems (TN or TT)
The AMD2000 series drive is designed to operate with grounded TN & TT systems where the three phase supply
is from a transformer with a grounded star point. With TN & TT systems any drive, motor or wiring ground fault
generates substantial currents which must be quickly interrupted with circuit breakers or fuses in the mains
supply as specified in
6.7 Power Disconnect and Protection Devices.
Fast semiconductor type fuses are
preferable as they provide protection to the diodes in the rectifiers of the drive, while circuit breakers are too slow
to protect semiconductor devices.
No separate connection for a neutral is provided, but in single phase supplies the neutral can be connected as a
phase input to L2/LC2. See
Figure 6-3
Mains Supply System for Single Phase Supply
6.3.13
Connection of drives to non-grounded systems (IT)
The AMD2000 series drive can also operate to non-grounded IT systems where the mains voltage to protective
earth does not exceed 265V. The advantage of IT systems is that any drive or motor or wiring ground fault does
not allow substantial current to flow and operation can be maintained in critical installations. The ground fault
must be promptly detected and eliminated before a second ground fault occurs, and because higher operating
voltages to earth will occur on motor cables and motor windings which may reduce the motor winding lifetime.
Ground fault detection is achieved with additional insulation type monitors.
Optional EMC line filters cannot be used on IT systems as excessive ground currents may occur in the filter, and
may damage the filter.
Surge arrestors connected between each supply and ground, located near the supply transformer are strongly
recommended for IT supply systems.
6.3.14
Harmonics and reactive power compensated supplies
The drive input diode bridge is a non-linear load to the mains supply and generates low frequency harmonic
effects in the frequency range up to 9 kHz. The harmonics can be reduced to acceptable levels with the addition
of a DC bus inductor as discussed in
section 6.6.11 Harmonic Suppression.
The non-linear currents cause non-
sinusoidal voltage drops across the internal resistance of the mains supply transformer and therefore distort the
voltage at the point of common coupling (PCC). This may affect other equipment connected at the PCC,
especially if multiple drives are connected from same supply. Calculation of the harmonics and voltage distortion
is site specific.
In multiple drive installations the harmonic currents may affect power supplies equipped with reactive power
compensation capacitors as resonances excited by the harmonics will occur at relatively low frequencies.
Therefore, it is strongly recommended that power compensation capacitors be fitted with reactor protection to
prevent harmonic resonances.