EM11 User’s Manual
2. Product Information
15
2.7.3 Wearing parts replacement
The wearing parts of frequency inverter include the cooling fan and filting electrolytic capacitor, its service
life is closely related to the using environment and maintenance status. The general service life is:
Part Name
Service Life
Fan
3 to 4 Years
Electrolytic capacitor
5 to 6 Years
The user can confirm the replace time according to the running time.
1.
Possible reasons for the damage of cooling fan: bearing wear and blade aging. Distinguish standard:
Any cracks in the fan blade, any abnormal vibration sound during the starting of frequency inverter.
2.
Possible reasons for the damage of filting electrolytic capacitor: poor quality of the input power supply,
the environment temperature is higher, the load change frequently and the electrolyte aging. Distinguish
standard: Any leakage of its liquid, if the safety valve is protruding, electrostatic capacitance and
insulation resistance measurement.
2.7.4 Storage of the frequency inverter
After buying the frequency inverter, users shall pay attention to the temporary and long-term storage as
following:
1.
Store the frequency inverter in the original packaging;
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.
2.8 Warranty Items
1.
Warranty only refers to frequency inverter.
2.
Under normal use, if there is any failure or damage, our company is responsible for the warranty within
12 months. (Leave factory date is subjected to the S/N on the frequency inverter nameplate or the
contract). When over 12 months, reasonable maintenance fee will be charged;
3.
During 12 months, if the following situation happens, certain maintenance fee will be charged;
a)
The users don’t follow the manual stated makes the frequency inverter damaged;
b)
The damage caused by fire, flood and abnormal voltage;
c)
The damage caused by using the frequency inverter for abnormal functions;
d)
The relevant service fee is calculated according to the manufacturer’s standard, if there is contract,
then it carries out subject to the contract.
2.9 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 the shorter deceleration time is needed and more
frequently braking, so the braking resistor needs the one with bigger power but smaller resistance value.
2. Product Information
EM11 User’s Manual
16
2.9.1 Selection of braking resistance value
When braking, almost all the renewable energy of motor is consumed on 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
Pb – Power of braking
2.9.2 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 EM11 Inverter braking components selection table
Model
Recommend
power of
braking resistor
Recommend
resistance value of
braking resistor
Braking
unit
Remarks
Single-phase 220V
EM11-G1-d75
80W
≥
150
Ω
EM11- G1-1d5
100W
≥
100
Ω
EM11- G1-2d2
100W
≥
70
Ω
Three-phase 220V
EM11-G2-d75
150W
≥
110
Ω
EM11- G2-1d5
250W
≥
100
Ω
EM11- G2-2d2
300W
≥
65
Ω
EM11- G2-004
400W
≥
45
Ω
EM11- G2-5d5
800W
≥
22
Ω
EM11- G2-7d5
1000W
≥
16
Ω
EM11- G2-011
1500W
≥
11
Ω
Built-in as
option
Add ”-B” to the
model
EM11- G2-015
2500W
≥
8
Ω
EM11- G2-018
3.7 kW
≥
8.0
Ω
EM11- G2-022
4.5 kW
≥
8
Ω
EM11- G2-030
5.5 kW
≥
4
Ω
EM11- G2-037
7.5 kW
≥
4
Ω
EM11- G2-045
4.5 kW×2
≥
4
Ω
×2 External
EM11- G2-055
5.5 kW×2
≥
4
Ω
×2 External
