Total Harmonic Distortion (Thd) - Honeywell SmartDrive HVAC Installation Manual

Variable frequency drive for heating, ventilation and air conditioning applications

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Table of Contents

Honeywell

• 5

AFETY

characteristics and it includes converters the rated voltage of which is less than 1000V and

which are intended for use in the 1st environment. This EMC class is meant for highly sensitive

areas and can be sometimes required in installations in e.g. hospitals or airport control towers.

NOTE: The requirements of class C1 are fulfilled only as far as the conducted emissions are

concerned with an external EMC-filter.

Category C2 (Honeywell EMC class H): All Honeywell SmartDrive HVAC inverters comply

with the requirements of category C2 of the product standard EN 61800-3 (2004). Category C2

includes converters in fixed installations and the rated voltage of which is less than 1000V. The

category C2 inverters can be used both in the 1st and the 2nd environment. This category ful-

fills the requirements with normal installations in buildings.

IT networks (Honeywell EMC class T): Inverters of this class fulfil the product standard EN

61800-3 (2004) if intended to be used in IT systems. In IT systems, the networks are isolated

from earth, or connected to earth through high impedance to achieve a low leakage current.

NOTE: if inverters configured to IT network are used with other supplies, no EMC requirements

are complied with. SmartDrive HVAC inverters can be easily modified to the requirements of

the T-class. This class is very typical requirement also in installations in ships. Also the 230V

SmartDrive HVAC products can be ordered as ready configured to this class by adding a T to

the end of standard product code (HVAC230-xxx-xxT).

Environments in product standard EN 61800-3 (2004):

First environment: Environment that includes domestic premises. It also includes establish-

ments directly connected without intermediate transformers to a low-voltage power supply net-

work which supplies buildings used for domestic purposes.

NOTE: houses, apartments, commercial premises or offices in a residential building are exam-

ples of first environment locations.

Second environment: Environment that includes all establishments other than those directly

connected to a low-voltage power supply network which supplies buildings used for domestic

purposes.

NOTE: industrial areas, technical areas of any building fed from a dedicated transformer are

examples of second environment locations.

1.4.1