Degree of Protection (IP Code)

This refers to the amount of protection afforded by the housing against penetration of solid foreign bodies and/or water. The IP code indicates the degree of protection.

First number

Protection against pene tration of solid foreign bodies

Second number

Protection against pene tration of water with disruptive effect

0 No protection 0 No protection

1 ≥ 50.0 mm 1 Drops of water falling

vertically

2 ≥ 12.5 mm 2 Drops of water from

angles up to 15°

3 ≥ 2.5 mm 3 Spray water

4 ≥ 1.0 mm 4 Splash water

5 Dust-protected 5 Water jets

6 Dust-proof 6 Powerful water jets

7 Temporary immersion 8 Continuous immersion

Device Degree of protection (IP code)

UE 2xx, UE 1xx, UE 2xxB, UR 2xx(D) IP 20

Line filters IP 20

UP 110 IP 20

UM 1xx IP 20

QAN asynchronous motors IP 54

QSY synchronous motors IP 65 (shaft bore: IP 64)

4 – 6 HEIDENHAIN Technical Manual for Inverter Systems and Motors 4.1.7 Connection to Different Types of Networks

Distribution systems – types of networks

HEIDENHAIN power supply units (UV, UVR, UR, UE) and their accessories (line filter, KDR) can only be used in symmetrical three-phase networks with a grounded and loadable star point, unless the line voltage is adjusted

separately. These are TN networks with a voltage of 3 x 400 V; 50 to 60 Hz (± 10%). Other power supply networks (e. g. TT, IT networks) must be adjusted via an isolating transformer, and other supply voltages must be adjusted via an autotransformer (see “Adjustment to Different Types of Networks" on page4 – 32 ).

The following illustrations show some of the possible types of networks:

„1: Symmetrical three-phase network with a grounded, loadable star point (= TN network). An isolating transformer for adjusting the line voltage is not necessary.

„2: Symmetrical three-phase network without a star point (= IT network). The use of an isolating transformer is absolutely necessary. The star point must be grounded on the secondary side.

„3: Asymmetrical three-phase network with a grounded external line. The use of an isolating transformer is absolutely necessary. The star point must be grounded on the secondary side.

„4: Symmetrical three-phase network with a non-grounded star point (9 = TT network). The use of an isolating transformer is absolutely necessary. The star point must be grounded on the secondary side.

„5: Symmetrical three-phase network without a star point. The use of an isolating transformer is absolutely necessary. The star point must be grounded on the secondary side.

„6: Asymmetrical three-phase network with midpoint tap. The use of an isolating transformer is absolutely necessary. The star point must be grounded on the secondary side.

April 2007 General Information 4 – 7 TN network TN networks provide a low-impedance galvanic connection between the

reference ground potentials of the power source and the grounding conductor potential of the electric consuming device (VDE 0100 Part 300). This means that direct connection of the inverter system is possible (without fault-current circuit breaker and isolating transformer) and, in the event of an error, proper electrical separation can be ensured by means of standard measures (e.g.

fuse).

Should you want for a specific reason to use a fault-current circuit breaker, you must use an AC/DC-universal fault-current circuit breaker Type B with a fault current of 300 mA. When using a fault-current circuit breaker, you must ensure that the grounding conductor of the inverter system is properly grounded and has a large enough cross section (min. 10 mm²).

If a low-impedance reference ground potential cannot be guaranteed by the power supply company, the inverter system must be connected in the same way as in a TT or IT network. This is due to the resulting asymmetries between the external lines and the star point, and makes the use of an isolating transformer absolutely necessary.

TT and IT networks For TT and IT networks, power supply companies require the inverters to be connected via fault-current circuit breakers or isolating transformers because a ground connection at the generator is not always provided (VDE 0100 Part 300). This is necessary because the line power must be quickly disconnected and all of the system's parts must be free of hazardous voltage when an error occurs (IEC 61800-5-1). This can only be ensured if appropriate measures are taken.

Appropriate protective measures are AC/DC-universal fault-current circuit breakers (Type B, switching threshold 300 mA, with frequency evaluation, available up to a rated current of 63 A) or an isolating transformer. In addition, the machine must have its own connection to ground (central grounding point).

The network requirements allow the use of a fault-current circuit breaker for the HEIDENHAIN compact inverters and the modular inverter systems up to 30 kW (e.g. UVR 120 D, UVR 130D; VDE 0100 Part 300). When connecting the inverter system, you must ensure that the grounding conductor of the inverter system is properly grounded and has a large enough cross section (min.

10 mm²).

If, however, the inverter systems for 45 kW and higher (e.g. UVR 140 D at max. load, UVR 150D, UVR 160D(W)) are used, the rated current of 63 A of the fault-current circuit breaker is exceeded. In this case an isolating transformer must be used. For connection and dimensions, see “Isolating transformer” on page 8.

Warning

Type A and Type AC fault-current circuit breakers must not be used.

Warning

Type A and Type AC fault-current circuit breakers must not be used.

4 – 8 HEIDENHAIN Technical Manual for Inverter Systems and Motors Isolating

transformer

If an isolating transformer is required, it must be wired on the secondary side in the Y circuit. The isolating transformer's star point on the secondary side must be connected to the grounding conductor potential and must be connected to the grounding conductor of the inverter system.

The following dimensions are recommended: