Table 4-11 Heatsink Mounted Braking Resistor Data - Emerson unidrive sp User Manual
Universal variable speed ac drive for induction and servo motors model sizes 0 to 6
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Safety
Product
Mechanical
Information
Information
Installation
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 size 0 to 2 this function is
enabled at default to protect the heatsink mounted resistor.
Below are the parameter settings.
Parameter
Full power
Pr 10.30
braking time
Full power
Pr 10.31
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 heatsink 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).
Table 4-11 Heatsink mounted braking resistor data
Parameter
Part number
1299-0001-00 1220-2756-01 1220-2758-01
DC resistance at 25°C
Peak instantaneous power
over 1ms at nominal
resistance
Average power over 60s *
Ingress Protection (IP)
rating
Maximum altitude
* To keep the temperature of the resistor below 70°C (158°F) in a 30°C
(86°F) ambient, the average power rating is 50W for size 1 and 100W for
size 2. The above parameter settings ensure this is the case.
Size 3 and larger do not have heatsink mounted braking resistors, hence
the default values of Pr 10.30 and Pr 10.31 are 0 (i.e. software braking
resistor overload protection disabled).
The internal braking resistor for size 0 can be used with a 400V size 0
drive even though its resistance is lower than the minimum resistance
values given in Table , because of the following reasons.
•
The braking resistor overload protection function in a 400V size 0
drive is set up to limit the power dissipated in the resistor
•
The braking resistor is installed with a thermistor which will trip the
drive if the resistor is too hot
•
The power rating of the resistor is only 50W
If an external resistor is used with the drive, its resistance must be equal
to or greater than the value given in Table .
4.9.2
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; this is described in Figure 4-14 on page 80.
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
Unidrive SP User Guide
Issue Number: 13
Electrical
Getting
Basic
installation
Started
parameters
Size 0
Size 1 and 2
200V
400V
200V
drive
drive
drive
0.06
0.01
0.09
2.6
1.7
3.3
Size 0
Size 1
Size 2
70Ω
75Ω
37.5Ω
8.7kW
8kW
16kW
50W
50W
100W
N/A
IP54
2000m
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Running
SMARTCARD
Optimization
the motor
operation
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 4.11.5 Compliance with
generic emission standards on page 87 for further details.
Internal connection does not require the cable to be armored or
shielded.
Minimum resistances and power ratings
Table 4-12 Minimum resistance values and peak power rating
for the braking resistor at 40°C (104°F)
400V
Model
drive
0.02
SP0201
SP0202
SP0203
SP0204
SP0205
SP1201
SP1202
SP1203
SP1204
SP2201
SP2202
SP2203
SP3201
SP3202
SP4201**
SP4202**
SP4203**
SP5201**
SP5202**
SP0401
SP0402
SP0403
SP0404
SP0405
SP1401
SP1402
SP1403
SP1404
SP1405
SP1406
SP2401
SP2402
SP2403
SP2404
SP3401
SP3402
SP3403
SP4401**
SP4402**
SP4403**
Onboard
Advanced
Technical
Diagnostics
PLC
parameters
Data
Minimum
Instantaneous
resistance*
power rating
Ω
kW
35
4.35
43
3.5
29
5.3
18
8.9
5.0
30.3
5.0
30.3
3.5
53
105
5.79
74
8.3
58
10.6
19
33.1
18
35.5
11
55.3
9
67.6
UL Listing
Information
Average power
for 60s
kW
0.74
1.1
1.5
2.2
3.0
1.5
2.2
3.0
4.4
6.0
8.0
8.9
13.1
19.3
22.5
27.8
30.3
43.5
0.74
1.1
1.5
2.2
3.0
1.5
2.2
3.0
4.4
6.0
8.0
9.6
13.1
19.3
22.5
22.5
27.8
33.0
45.0
53.0
67.5
79
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