Derating data

Current derating as a function of the pulse frequency

¹⁾ For these Power Modules, the factory default pulse frequency setting is 2 kHz. If switched over to 4 kHz, the RFI suppression limit values for Category C3 are complied with.

Current derating as a function of ambient temperature

Permissible output current as a function of the ambient temperature for low overload (LO) and high overload (HO)

Note:

The operating temperature ranges of the Control Units should be taken into account. The temperature ranges are specified in the section Technical specifications under Control Units.

Current derating as a function of the installation altitude

Permissible line supplies as a function of the installation altitude

• Installation altitude up to 2000 m (6562 ft) above sea level
  • Connection to every supply system permitted for the inverter
• Installation altitudes between 2000 m (6562 ft) and 4000 m (13124 ft) above sea level
  • Connection to a TN system with grounded neutral point
  • TN systems with grounded line conductor are not permitted
  • The TN line system with grounded neutral point can also be supplied using an isolation transformer
  • The phase-to-phase voltage does not have to be reduced

Permissible output current as a function of the installation altitude

Note:

The connected motors, power elements and components must be considered separately.

Current derating as a function of the installation altitude and the ambient temperature

At installation altitudes above 1000 m (3281 ft), the permissible output current can be compensated to a certain extent using the ambient temperature.

Current/power derating as a function of the line voltage

PM240P-2 Power Modules supply a constant power in the line voltage range 380 V to 480 V 3 AC. The constant power results in current derating as a function of the line voltage.

PM240P-2 Power Modules supply a constant output current in the line voltage range 500 V to 690 V 3 AC. Output power derating takes place as a function of the line voltage.

Overload capability

The Power Modules are equipped with an overload reserve e.g. to handle breakaway torques. If larger surge loads occur, this must be taken into account in the configuration. For drives with overload requirements, the appropriate base-load current must, therefore, be used as a basis for the required load.

The units can operate in two different duty cycles in the permissible continuous operating range. Depending on how the system is dimensioned, the relevant base-load current is effective as a rated quantity.

The criterion for overload is that the inverter is operated with its base-load current before and after the overload occurs on the basis of a duty cycle duration of 300 s.

The base-load current I_L for low overload is the basis for a duty cycle of 135 % for 3 s plus 110 % for 57 s.

The base-load current I_H for a high overload is based on a duty cycle of 150 % for 60 s.

Overload capability, low overload

Overload capability, high overload