Resistor Choice - Baldor MotiFlex e100 Installation Manual

3.9.4 Resistor choice

P is the value to use when assessing which regeneration resistor to use. However, a safety
av
margin of 1.25 times is recommended to ensure the resistor operates well within its limits*, so:
Required resistor power rating = 1.25 × P
The range of suitable regeneration resistors for each MotiFlex e100 model is shown in Table 6.
Choose the resistor that has a power rating equal to or greater than the value calculated above.
The resistance must be not be less than the minimum resistance stated for the particular
MotiFlex e100 model.
MotiFlex e100 MotiFlex e100
catalog
number
MFE460A001
MFE460A003
MFE460A006
MFE460A010
MFE460A016
MFE460A021
MFE460A026
MFE460A033
MFE460A048
MFE460A065
* The regeneration resistors listed in Table 6 can withstand a brief overload of 10 times the rated
power for 5 seconds.
Note that a greater minimum resistance is specified when sharing the DC bus or using
regeneration duty cycles greater than 0.2. This is because the drive to which the resistor is
connected will be required to switch the regeneration energy from all of the shared drives. The
shared drives could regenerate at different times, causing a greatly increased effective duty cycle
(see section 3.9.7). Alternatively, several drives could regenerate at the same time, causing large
peaks in regeneration energy. The greater minimum resistance allows for this extra loading and
provides protection for the host drive's regeneration output circuitry.
Optionally, additional regeneration resistors may be connected to other drives in the group. Since
all MotiFlex e100 drives have approximately the same regeneration threshold voltage,
regeneration energy in the system will be shared proportionally (according to resistance) between
all drives fitted with a regeneration resistor. Each resistor must still meet the Sharing DC bus or
duty > 0.2 requirement, listed in Table 6, for the drive to which it is fitted.
3-40 Basic Installation
= ________________ W (watts)
Minimum resistance
Single stand-alone
drive
60 Ω
33 Ω 33 Ω
15 Ω
7.5 Ω 7 5 Ω
Table 6 - Regeneration resistors
av
Sharing DC bus,
or duty > 0.2
150 Ω
68 Ω 68 Ω
60 Ω
33 Ω 33 Ω
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Suitable resistors Suitable resistors
(spec = Baldor part)
60 Ω, 100 W = RGJ160
60 Ω, 200 W = RGJ260 60 Ω, 200 W = RGJ260
60 Ω, 300 W = RGJ360
150 Ω, 100 W 150 Ω, 100 W = RGJ1150 RGJ1150
150 Ω, 200 W = RGJ2150 Ω G
150 Ω, 300 W = RGJ3150
33 Ω, 500 W = RGJ533 33 Ω, 500 W = RGJ533
68 Ω, 300 W = RGJ368
15 Ω, 500 W = RGJ515
60 Ω, 300 W = RGJ360 60 Ω, 300 W = RGJ360
10 Ω, 1.2 kW = RGA1210
10 Ω 2 4 kW = RGA2410 10 Ω, 2.4 kW = RGA2410
10 Ω, 4.8 kW = RGA4810
MN1943