58
Digitax HD M75X Series Installation and Technical Guide
Issue Number: 5
Table 4-10 Compact braking resistor data
4.8.2 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
EMC (Electromagnetic compatibility) on page 61
for further details.
Internal connection does not require the cable to be armored or shielded.
Table 4-11 Minimum resistance values and peak power rating for the braking resistor at 40 °C (104 °F)
* Resistor tolerance: ±10 %. The minimum resistance specified are for stand-alone drive systems only. If the drive is to be used as part of a common
DC bus system different values may be required. See
Braking resistor software overload protection
Braking resistor overload protection parameter settings.
Failure to observe the following information may damage the resistor.
The drive software contains an overload protection function for a braking resistor, this function is enabled at default to protect the compact
resistor.
Below are the parameter settings.
For more information on the braking resistor software overload protection, see Pr
10.030
, Pr
10.031
and Pr
10.061
full descriptions in the
relevant
Control User Guide
.
CAUTION
Parameter
All frames
200 V drive
400 V drive
Braking resistor rated power
Pr
10.030
50 W
Braking resistor thermal time constant
Pr
10.031
2 s
Braking resistor resistance
Pr
10.061
70
Parameter
All frames
Part number
3470-0152
DC resistance at 25 °C
70
Peak instantaneous power over 1 ms at nominal resistance
200 V
400 V
2.2 kW
8.7 kW
Average power over 60 s
50 W
Thermal protection
When an external braking resistor is used, it is essential that a thermal protection device is incorporated in the braking resistor circuit
.
Model
Minimum resistance*
(Pr 10.061)
Peak power rating
Continuous power rating
(Maximum Pr 10.030 setting)
Maximum braking resistor
thermal time constant
(Pr 10.031)
Ω
kW
kW
s
200 V
01200022
25
6
2
2
01200040
25
6
2
2
01200065
25
6
2
2
02200090
13
11.1
3.7
2
02200120
13
11.1
3.7
2
03200160
10
15
5
2
400 V
01400015
106
5.7
1.9
2
01400030
106
5.7
1.9
2
01400042
106
5.7
1.9
2
02400060
36
16.8
5.6
2
02400080
36
16.8
5.6
2
02400105
36
16.8
5.6
2
03400135
26
22.8
7.6
2
03400160
26
22.8
7.6
2
WARNING
Summary of Contents for Digitax HD M75 Series
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