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Operating Instructions – Electronic Motor DRC.-..-DAC
5
Installation instructions
Electrical Installation
5.2.10 Installation above 1000 m asl
You can install DRC drive units at altitudes from 1000 m to a maximum of 4000 m above
sea level
1)
provided the following conditions are met:
• The nominal continuous power is reduced due to the reduced cooling above 1000 m
(see chapter "Technical data and dimension sheets").
• Above 2000 m above sea level, the air and creeping distances are only sufficient for
overvoltage class 2. If the installation requires overvoltage class 3, you will have to
install additional external overvoltage protection to limit overvoltage peaks to 2.5 kV
phase-to-phase and phase-to-ground.
• If safe electrical disconnection is required, it must be implemented outside the unit
for altitudes of 2000 m above sea level and higher (safe electrical disconnection in
accordance with EN 61800-5-1).
• At installation altitudes between 2000 m and 4000 m above sea level, the permitted
rated power supply voltages are reduced as follows:
– By 6 V per 100 m
5.2.11 Protection devices
• DRC drive units are equipped with integrated protection devices against overload.
• Cable protection must be implemented using external overload devices.
• Observe the relevant standards concerning cable cross section, voltage drop and
installation type.
1) The maximum altitude is limited by the reduced electric strength due to the lower air density.
