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Digitax ST User Guide
27
Issue: 5
Table 4-10 Internal braking resistor data
4.8.1 External braking resistor
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
(Electromagnetic compatibility) on page 28
for further details.
Internal connection does not require the cable to be armored or
shielded.
Table 4-11 Minimum resistance and power ratings
* 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.
With the internal EMC filter installed the ground leakage current is as
follows:
Table 4-12 Ground leakage current with internal EMC filter installed
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 = <1 mA.
In both cases, there is an internal voltage surge suppression device
connected to ground. Under normal circumstances, this carries
negligible current.
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
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.
Parameter
Part number
1299-0001
DC resistance at 25
°
C
70
Ω
Peak instantaneous power over 1ms at nominal
resistance
200 V
400 V
2.2 kW 8.7 kW
Average power over 60 s
50 W
Braking resistor overload protection parameter settings
Failure to observe the following information may
damage the resistor.
The drive’s software contains an overload protection
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.
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).
Overload protection
When an external braking resistor is used, it is essential that
an overload protection device is incorporated in the braking
resistor circuit.
CAUTION
Parameter
200 V
drive
400 V
drive
Full power braking
time
Pr
10.30
0.06
0.01
Full power braking
period
Pr
10.31
2.6
1.7
WARNING
Model
Minimum
resistance*
Peak
power
rating
Continuous
power rating
Average
power for
0.25s
Ω
kW
kW
kW
DST1201
23
6.6
0.5
1.6
DST1202
1.2
3.5
DST1203
1.6
4.9
DST1204
16
9.3
2.3
7.0
DST1401
111
5.5
0.8
2.3
DST1402
1.4
4.1
DST1403
75
8.1
2.0
6.1
DST1404
28
21.7
3.0
9.0
DST1405
4.1
12.2
Model
3 phase Star
ground
3 phase Delta
ground
1 phase
mA
DST120X at 220 V
4
10
3
DST140X at 400 V
12
40
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
2
.
Only type B ELCB / RCD are suitable for use with 3 phase
inverter drives.
NOTE
NOTE
WARNING
WARNING
Содержание Digitax ST
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