NORD Drivesystems BU0200 - Manual (Page 22)

1 General information
BU 0200 GB-4411 Subject to technical alterations 21
1.7 Version with protection class IP55 / IP66
The SK 2xxE frequency inverters in sizes 1 to 3 and the additional modules are available in protection
classes IP55 (standard) or IP66 (optional). The SK 2x0E frequency inverters in size 4 are only available in
protection class IP55.
Protection class IP66 must always be stated when ordering!
There are no restrictions or differences to the scope of functions in either protection class. In order to
differentiate the protection classes, modules with protection class IP66 are given an extra “-C” (coated 
coated PCBs) in their type designation (See NOTE field!).
e.g. SK 205E-750-340-A-C
IP55 version:
The IP55 version of the SK 2xxE is the standard version. Both versions (motor-mounted, mounted on the
motor or wall-mounted on a wall bracket) are available. In addition, all adapter units, technology units and
customer units are available for this version.
IP66 version:
In contrast to the IP55 version the IP66 version is a modified option. Both versions (motor-integrated, close
to motor) are also available. The modules available for the IP66 version (adapter units, technology units and
customer units) have the same functionalities as the corresponding modules for the IP55 version.
NOTE
The modules for the IP66 design are identified by an additional "-C" and are modified
according to the following special measures listed below. Size 4 frequency inverters are
also available as "coated" versions "-C", however, due to the integrated fan they only fulfil
IP55.
Special measures:
Impregnated PCBs,
Powder coating RAL 9006 (white aluminium) for housing
Diaphragm valve for pressure compensation on temperature changes.
Low pressure test
 A free M12 screw connection is required for low pressure testing. After successful testing, a
diaphragm valve is inserted here. This screw connection is therefore no longer available for
a cable gland.
If the frequency inverter is to be retro-fitted, i.e. the drive unit (inverter mounted on the motor) is not
completely obtained from NORD, the membrane valve is supplied in the bag supplied with the frequency
inverter. The valve must be correctly fitted on site by the plant constructor (Note: the valve must be mounted
as high as possible, in order to avoid contact with standing moisture (e.g.: standing moisture due to
condensation).
NOTE
For all versions, care must be taken that the cable and the cable gland are carefully
matched. Wherever possible, the cables should be inserted so that water is deflected away
from the device (if necessary use loops). This is the only way to ensure permanent
compliance with the required protection class.