Low Voltage Dc Power Supply; Ratings; Table 4-2 Supply Fault Current Used To Calculate Maximum Input Currents - Emerson unidrive sp User Manual

Safety Product Mechanical
Information Information Installation
4.6

Low voltage DC power supply

The drive can be operated from low voltage DC supplies, nominally
24Vdc (control) and 48Vdc (power). The low voltage DC power
operating mode is designed either, to allow for motor operation in an
emergency back-up situation following failure of the AC supply, for
example in elevators; or to limit the speed of a servo motor during
commissioning / start-up of equipment, for example a robot cell.
With low voltage DC operation there is a reduction in the
level of safety of the SAFE TORQUE OFF function. There
exist certain unlikely faults which might permit the drive to
produce some limited motor torque, if the DC supply has its
WARNING
negative terminal connected to ground.
See section 4.16 SAFE TORQUE OFF for methods for
preventing a loss of the safety function under these
conditions
The working voltage range of the low voltage DC power supply is as
follows:
Size 0
Minimum continuous operating voltage:
Minimum start up voltage:
Nominal continuous operating voltage:
Maximum braking IGBT turn on voltage:
Maximum over voltage trip threshold:
Size 1
Minimum continuous operating voltage:
Minimum start up voltage:
Nominal continuous operating voltage:
Maximum braking IGBT turn on voltage:
Maximum over voltage trip threshold:
Size 2 and 3
Minimum continuous operating voltage:
Minimum start up voltage:
Nominal continuous operating voltage:
Maximum braking IGBT turn on voltage:
Maximum over voltage trip threshold:
Size 4 (200V drives)
Minimum continuous operating voltage:
Nominal continuous operating voltage:
Maximum braking IGBT turn on voltage:
Maximum over voltage trip threshold:
Size 4, 5 and 6 (400V and 690V drives)
Minimum continuous operating voltage:
Nominal continuous operating voltage:
Maximum braking IGBT turn on voltage:
Maximum over voltage trip threshold:
See section 4.5 Control 24Vdc supply on page 72 for 24V back-up to
control.
NOTE
The nominal low voltage supply level is set by the user in Pr 6.46.
The default setting is 48V for all drive sizes.
The over voltage trip threshold and braking IGBT turn on voltage are
scaled from this value as follows:
Brake IGBT turn on = 1.325 x Pr 6.46 (V)
Over voltage trip = 1.45 x Pr 6.46 (V)
For application data, refer to the Unidrive SP Low Voltage DC Operation
Installation Guide.
Unidrive SP User Guide
Issue Number: 13
Electrical Getting Basic
installation Started parameters
36V
40V
48 to 72V
95.4V
104.4V
36V
40V
48V
63.6V
69.6V
36V
40V
48 to 72V
95.4V
104.4V
36V
48 to 72V
95.4V
104.4V
36V
48 to 96V
127.2V
139.2V
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Optimization
the motor operation
4.7

Ratings

The input current is affected by the supply voltage and impedance.
Typical input current
The values of typical input current are given to aid calculations for power
flow and power loss.
The values of typical input current are stated for a balanced supply.
Maximum continuous input current
The values of maximum continuous input current are given to aid the
selection of cables and fuses. These values are stated for the worst case
condition with the unusual combination of stiff supply with bad balance.
The value stated for the maximum continuous input current would only
be seen in one of the input phases. The current in the other two phases
would be significantly lower.
The values of maximum input current are stated for a supply with a 2%
negative phase-sequence imbalance and rated at the supply fault
current given in Table 4-2.

Table 4-2 Supply fault current used to calculate maximum input currents

Model
All
Onboard Advanced Technical
Diagnostics
PLC parameters Data
Symmetrical fault level (kA)
100
UL Listing
Information
73