Ac Supply Requirements; Figure 4-8 Size 4, 5 And 6 Ground Connections; Table 4-1 Behavior Of The Drive In The Event Of A Motor Circuit Ground (Earth) Fault With An It Supply - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation

Figure 4-8 Size 4, 5 and 6 ground connections

Supply
ground
Motor
ground
The ground loop impedance must conform to the
requirements of local safety regulations.
The drive must be grounded by a connection capable of
carrying the prospective fault current until the protective
WARNING
device (fuse, etc.) disconnects the AC supply.
The ground connections must be inspected and tested at
appropriate intervals.
4.2

AC supply requirements

Voltage:
SPx2xx 200V to 240V ±10%
SPx4xx 380V to 480V ±10%
SPx5xx 500V to 575V ±10%
SPx6xx 500V to 690V ±10%
Number of phases: 3*
*200V size 0 drives can also be used on a single phase supply.
Maximum supply imbalance: 2% negative phase sequence (equivalent
to 3% voltage imbalance between phases).
Frequency range: 48 to 65 Hz
For UL compliance only, the maximum supply symmetrical fault current
must be limited to 100kA
4.2.1 Supply types
All drives are suitable for use on any supply type i.e TN-S, TN-C-S, TT
and IT.
• Supplies with voltage up to 600V may have grounding at any
potential, i.e. neutral, centre or corner ("grounded delta")
• Supplies with voltage above 600V may not have corner grounding
Drives are suitable for use on supplies of installation category III and
lower, according to IEC60664-1. This means they may be connected
permanently to the supply at its origin in a building, but for outdoor
installation additional over-voltage suppression (transient voltage surge
suppression) must be provided to reduce category IV to category III.
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the motor operation
Operation with IT (ungrounded) supplies:
Special attention is required when using internal or external
EMC filters with ungrounded supplies, because in the event
of a ground (earth) fault in the motor circuit the drive may not
WARNING
trip and the filter could be over-stressed. In this case, either
the filter must not be used (removed) or additional
independent motor ground fault protection must be provided.
Refer to Table 4-1.
For instructions on removal, refer to Figure 4-22 Removal of
internal EMC filter and line to ground varistors (size 0) ,
Figure 4-23 Removal of internal EMC filter (size 1 to 3) and
Figure 4-24 Removal of internal EMC filter (sizes 4 to 6) on
page 84.
For details of ground fault protection contact the supplier of
the drive.
A ground fault in the supply has no effect in any case. If the motor must
continue to run with a ground fault in its own circuit then an input
isolating transformer must be provided and if an EMC filter is required it
must be located in the primary circuit.
Unusual hazards can occur on ungrounded supplies with more than one
source, for example on ships. Contact the supplier of the drive for more
information.
Table 4-1 Behavior of the drive in the event of a motor circuit
ground (earth) fault with an IT supply
Drive size Internal filter only
May not trip – precautions
0 (200V)
0 (400V) Drive trips on fault
1 and 2 Drive trips on fault
May not trip – precautions
3
May not trip – precautions
4 to 6
4.2.2 Supplies requiring line reactors
Input line reactors reduce the risk of damage to the drive resulting from
poor phase balance or severe disturbances on the supply network.
Where line reactors are to be used, reactance values of approximately
2% are recommended. Higher values may be used if necessary, but may
result in a loss of drive output (reduced torque at high speed) because of
the voltage drop.
For all drive ratings, 2% line reactors permit drives to be used with a
supply unbalance of up to 3.5% negative phase sequence (equivalent to
5% voltage imbalance between phases).
Severe disturbances may be caused by the following factors, for example:
• Power factor correction equipment connected close to the drive.
• Large DC drives having no or inadequate line reactors connected to
the supply.
• Across the line (DOL) started motor(s) connected to the supply such
that when any of these motors are started, the voltage dip exceeds
20%.
Such disturbances may cause excessive peak currents to flow in the
input power circuit of the drive. This may cause nuisance tripping, or in
extreme cases, failure of the drive.
Drives of low power rating may also be susceptible to disturbance when
connected to supplies with a high rated capacity.
Line reactors are particularly recommended for use with the following
drive models when one of the above factors exists, or when the supply
capacity exceeds 175kVA:
SP0201 SP0202 SP0203 SP0204 SP0205
SP0401 SP0402 SP0403 SP0404 SP0405
SP1201 SP1202 SP1203 SP1204
SP1401 SP1402 SP1403 SP1404
Onboard Advanced Technical
Diagnostics
PLC parameters Data
External filter (with internal)
Drive trips on fault
required
Drive trips on fault
Drive trips on fault
Drive trips on fault
required
May not trip – precautions
required required
UL Listing
Information
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