Discharge Resistor And Protection - Control Techniques Unidrive Installation Manual

5.2

Discharge resistor and protection

The discharge resistor is required to discharge the DC bus of the drive whilst changing
from one supply to the other.
Table 5-3 Discharge resistor and protection values
SP1201 to SP1202
SP1203 to SP1204
SP2201 to SP2203
SP3201 to SP3202
SP4201 to SP4203
SP1401 to SP1406
SP2401 to SP2404
SP3401 to SP3403
SP4401
SP4402 to SP4403
SP5401 to SP5402
SP6401
SP6402
SPMA1401
SPMA1402
SPMD1401
SPMD1402
SPMD1403 to SPMD1404
SP3501 to SP3507
SP5601 to SP5602
SP6601 to SP6602
SPMA1601
SPMA1602
SPMD1601
SPMD1602
SPMD1603
SPMD1604
*The chosen thermal overload relay must have a class 10 trip characteristic.
High temperatures
The discharge resistor can reach high temperatures. Locate the resistors so that
damage cannot result. Use cable having insulation capable of withstanding high
temperatures.
WARNING
32
Rdis
Drive
(Ω)
220
100
100
100
100
680
220
220
220
100
100
100
100
100
100
100
100
100
220
100
100
100
100
100
100
100
100
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Total Power Short term (1s)
rating energy rating
(W) (J)
6 3950
4 2580
6 4030
12 8670
9 6470
17 12180
6 3940
11 7720
9 6660
18 13050
25 18330
33 24510
49 36250
33 24510
49 36250
33 24510
49 36250
62 46560
12 8870
23 17210
35 25850
35 25850
35 25850
35 25850
35 25850
37 27230
37 27230
Unidrive SP Low Voltage DC Installation Guide
Thermal overload
relay trip setting
(A)*
0.13
0.25
0.34
0.48
0.48
0.1
0.25
0.32
0.3
0.6
0.79
1.0
1.1
1.0
1.1
1.0
1.1
1.1
0.35
0.8
0.9
0.9
0.9
0.9
0.9
1.0
1.1
Issue Number: 1