EM15 User’s Manual
2. Product Information
13
2.
Long-term storage can lead to the degradation of electrolytic capacitors, and must ensure to power on for once
within 2 years. And the power-on time is at least 5 hours. The input voltage must slowly rise to the rating by
using the voltage regulator.
2.6 Selection Guide of braking component
Table 2-5 is the recommended value of braking resistor, users can select the different resistance value and power
according to the actual situation,(but the resistance value must not be less than the recommended value in the table,
and the power can be bigger.) The selection of braking resistance need to be confirmed according to the power
that the motor generated in the practical application systems, and is relevant to the system inertia, deceleration
time, the energy of the potential energy load, needs customers to choose according to actual situation. The greater
the inertia and the shorter deceleration time is needed more frequently braking, so the braking resistor needs the
one with bigger power but smaller resistance value.
2.6.1 Selection of braking resistance value
When braking, almost all the regenerated energy of motor is consumed by the braking resistor.
According to the formula: U * U/R = Pb
In the formula:
U --- The braking voltage when the system brake stably (different system is different, for the 380VAC system
generally take 700V)
R - Braking resistor value
Pb – Power of braking(W)
2.6.2 Selection power of braking resistor
In theory the power of braking resistor is consistent with the braking power, but it need to be taken into
consideration that the braking resistor power will derate to 70%.
According to the formula: 0.7*Pr=Pb*D
In this formula:
Pr----Power of resistor
D---- Braking proportion (the proportion that the regeneration process accounts for the whole process)
Elevator---- 20%~30%
Uncoiling and coiling machine---- 20%~30%
Centrifugal machine---- 50%~60%
Occasionally braking load---- 5%
Other machine generally-----10%
Table 2-5 EM15 Inverter braking components selection table
Inverter Power
Recommend
power of braking
resistor
Recommend
resistance value of
braking resistor
Braking
unit
Remarks
Single phase 220V
EM15-G1-d75
80W
≥ 150Ω
Built-in as
standard
No special
instructions
EM15-G1-1d5
100W
≥ 100Ω
EM15-G1-2d2
100W
≥ 70Ω
Three phase 220V
EM15-G2-d75
150W
≥ 110Ω
Built-in as
standard
No special
instructions
EM15-G2-1d5
250W
≥ 100Ω
