Yaskawa Europe GmbH
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65760 Eschborn
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Tel. +49 (0)61 96/569–300
Frequently Asked Question
Topic:
Can the 1000series drives be installed 4000m above
sea level?
Author
Yaskawa
Product:
A1000, V1000, J1000, L1000, T1000
Date
21-Dec-2010
Keywords:
Altitude, derating
Pages
1 of 2
Distribution:
Internal Use only
Customer
In general the 1000series Drives are designed for an installation below 1000 m altitude above
sea level. In case the drives are installed in higher altitudes a derating has to be applied to output current, input voltage and ambient temperature. This is necessary due to the reduced air
pressure and its influence on cooling capabilities and voltage insulation.
The absolute maximum altitude is 4000 m above sea level. Following derating applies:
Altitude above
Sea Level
Voltage Derating
Below 1000 m
Between
1000m
and 4000m
Above 4000m
Output Current
Derating
Ambient Temperature
Derating
No derating required
Derating of 1% of the
max. input voltage per
100 m above the 1000m.
Derating of 1% of the
rated output current per
100 m above the 1000m
Derating of 0.5% of the
max. temperature per
100m above the 1000m
Operation is not allowed.
Notes:
1. Do not carry out a withstand voltage test at any altitude. Voltage withstand testing has
been done at factory before factory out.
2. Generally, the temperature decreases as the altitude increases. Control the temperature, and the drive ambient temperature will not be lower than -10°C. Excessively low
temperature could result in deterioration of electrolytic capacitor capacity, improper fan
operation, and electronic circuit malfunction.
3. There is correlation between voltage and current in case the load is the same. In case of
decreasing voltage, current is increased in inverse proportion. Therefore it might become necessary to increase the frame size of the motor and the drive.
4. In order to set the correct output current derating for the drive please set L8-35 = 3 and
calculate the setting of parameter L8-12 according to following formula:
L8-12 = (100% - Derating) x 66.7 + 30 [°C]
For example: if an output current derating of 80% is required (3000m altitude) L8-12 is
calculated to (100% - 80%) x 66.7 + 30 = 43.3 °C
Can the 1000series drives be installed 4000m above sea level.doc
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21.12.2010
5. In case of operation at altitudes higher than 1000m, the withstand voltage is decreased.
Performance of the withstand voltage will down to 80% at altitudes 3000m, and to 70%
at altitudes 4000m. These value is assumption, is not assured value.
6. As the withstand voltage is decreased in case of operation at altitudes higher than
1000m, Drive can not satisfy the requirement of the safety standard such as UL and CE.
Can the 1000series drives be installed 4000m above sea level.doc