Ground Leakage; Table 4-10 Internal Braking Resistor Data; Table 4-11 Minimum Resistance And Power Ratings; Table 4-12 Ground Leakage Current With Internal Emc Filter Installed - Emerson Digitax ST User Manual

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Table 4-10 Internal braking resistor data

Parameter
Part number
DC resistance at 25°C
Peak instantaneous power over 1ms at nominal
resistance
Average power over 60s
Braking resistor overload protection parameter settings
Failure to observe the following information may
damage the resistor.
The drive's software contains an overload protection
CAUTION
function for a braking resistor. On Digitax ST this function is
enabled at default to protect the internally mounted resistor.
Below are the parameter settings.
Parameter
Full power braking
time
Full power braking
period
For more information on the braking resistor software
overload protection, see Pr 10.30 and Pr 10.31 full
descriptions in the Advanced User Guide.
If the internally mounted braking resistor is to be used at
more than half of its average power rating then the drive's
cooling fan must be at full speed, controlled by setting
Pr 6.45 to On (1).
4.8.1 External braking resistor
Overload protection
When an external braking resistor is used, it is essential that
an overload protection device is incorporated in the braking
resistor circuit.
WARNING
When a braking resistor is to be mounted outside the enclosure, ensure
that it is mounted in a ventilated metal housing that will perform the
following functions:
• Prevent inadvertent contact with the resistor
• Allow adequate ventilation for the resistor
When compliance with EMC emission standards is required, external
connection requires the cable to be armored or shielded, since it is not
fully contained in a metal enclosure. See section 4.10 EMC
(Electromagnetic compatibility) on page 27 for further details.
Internal connection does not require the cable to be armored or
shielded.
26
Electrical Getting Basic
installation started parameters
1299-0001
70Ω
200V
2.2kW 8.7kW
50W
200V 400V
drive drive
Pr 10.30 0.06 0.01
Pr 10.31 2.6
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Running the SMARTCARD
Optimization
motor Operation

Table 4-11 Minimum resistance and power ratings

Minimum
resistance*
Model
400V
DST1201
DST1202
DST1203
DST1204
DST1401
DST1402
DST1403
DST1404
DST1405
* Resistor tolerance: ±10%
4.9

Ground leakage

The ground leakage current depends upon whether the internal EMC
filter is installed. The drive is supplied with the filter installed. Instructions
for removing the internal filter are given in Figure 4-4.
1.7
With the internal EMC filter installed the ground leakage current is as
follows:

Table 4-12 Ground leakage current with internal EMC filter installed

Model
DST120X at 220V
DST140X at 400V
NOTE
The above leakage current is just the leakage current of the drive with the
internal EMC filter connected and does not take into account any leakage
currents of the motor or motor cable.
With internal EMC filter removed the ground leakage current = <1mA.
NOTE
In both cases, there is an internal voltage surge suppression device
connected to ground. Under normal circumstances, this carries
negligible current.
When the internal EMC filter is installed, the leakage current
is high. In this case, a permanent fixed ground connection
must be provided with a cross sectional area equal to 10mm
WARNING
4.9.1 Use of residual current device (RCD)
There are three common types of ELCB / RCD:
1. AC - detects AC fault currents
2. A - detects AC and pulsating DC fault currents (provided the DC
current reaches zero at least once every half cycle)
3. B - detects AC, pulsating DC and smooth DC fault currents
• Type AC should never be used with drives
• Type A can only be used with single phase drives
• Type B must be used with three phase drives
Only type B ELCB / RCD are suitable for use with 3 phase
inverter drives.
WARNING
If an external EMC filter is used, a delay of at least 50ms should be
incorporated to ensure spurious trips are not seen. The leakage current
is likely to exceed the trip level if all of the phases are not energized
simultaneously.
Onboard Advanced Technical
PLC parameters Data
Peak
Continuous
power
power rating
rating
Ω
kW kW
0.5
23 6.6 1.2
1.6
16 9.3 2.3
0.8
111 5.5
1.4
75 8.1 2.0
3.0
28 21.7
4.1
3 phase Star 3 phase Delta
ground ground
mA
4 10
12 40
Digitax ST User Guide
UL listing
Diagnostics
information
Average
power for
0.25s
kW
1.6
3.5
4.9
7.0
2.3
4.1
6.1
9.0
12.2
1 phase
3
2
.
Issue: 3