Service and maintenance, Danger – NORD Drivesystems B2000 User Manual
Page 39
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5. Service and maintenance
www.nord.com B2000-GB-0413
-39-
General overhaul
With Category 2G and 2D gear units, a general overhaul is necessary after a specified longer
period of operation. The specification of the operating period in terms of operating hours, after
which a general overhaul must be carried out, can be seen from the rating plate data in field MI.
Alternatively, the maintenance class CM can be used to determine the operating period after
which a general overhaul must be carried out. The data in field MI of the rating plate is then e.g.:
MI CM=5.
The time for the general overhaul with the stated maintenance class CM is calculated as follows:
NA= CM
fL
kA
NA: Number of years since commissioning. With calculated values of NA which exceed 10
years, a general overhaul is due 10 years after commissioning.
CM: Maintenance class according to field MI of the rating plate
fL:
Running time factor
fL= 10
Maximum running time 2 hours per day
fL= 6
Running time 2 to 4 hours per day
fL= 3
Running time 4 to 8 hours per day
fL= 1.5 Running time 8 to 16 hours per day
fL= 1
Running time 16 to 24 hours per day
kA: Utilisation
factor
If the utilisation factor is unknown, KA=1.
If the actual power required by the application is known, longer maintenance intervals may
result. The utilisation factor may be calculated as follows:
3
tat
P
1
P
A
k
P1: Max. permissible drive power or motor power in kW according to the rating plate
Ptat: Actual drive power or motor power in kW which is required by the application at the rated
speed. This is determined e.g. by measurements.
With variable loads with differing actual drive powers with rated speeds Ptat1, Ptat2,
Ptat3, … with known percentage times q1, q2, q3, …, the following equivalent average
drive power applies:
3
3
3
3
2
3
2
1
3
1
100
100
100
...
q
P
q
P
q
P
P
tat
tat
tat
tat
Danger!
The general overhaul must be carried out by qualified personnel in a specialist
workshop with appropriate equipment in observance of national regulations and laws.
We urgently recommend that the general overhaul is carried out by NORD Service.