5
Electrical installation
Installation instructions
Operating Instructions – MOVI-C
®
FIELD CONTROLLER standard/advanced
43
5.3.9
Installation above 1000 m asl
You can install the drive units at altitudes from
1000
m to a maximum of
3800
m
above sea level provided that the following conditions are met.
1)
• The nominal current I
N
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
category
II. If the installation requires overvoltage
category
III, you
will have to install additional external overvoltage protection to limit overvoltage
peaks to 1.5 kV phase-to-phase and 2.5 kV 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
3800
m above sea level, the permit-
ted rated power supply voltages are reduced as follows:
–
By 6 V per 100 m
1) The maximum altitude is limited by the reduced dielectric strength due to the lower air density.
5.3.10
Protection devices
• The units come equipped with integrated protection devices against overload.
• Cable protection for the power cable must be implemented using external overload
devices.
• Observe the relevant standards concerning the cable cross section, voltage drop
and installation type.
26872137/EN – 12/2021