ARTDrive V2 series - Instruction Manual Chapter 3 Installation Guide lines • 35
- Motor rated frequency
- Motor rated speed at full load
- Power factor
The other data required for vector control is calculated inside the inverter.
Motor protection
Thermistors
PTC thermistors according to DIN 44081 or 44082 fitted in the motor can be
connected directly to the frequency inverter via terminals 78 and 79. In this case
the resistor (1Kohm) mounted between the terminals 78 and 79 has to be
removed.
Temperature-dependent contacts in the motor winding
Temperature-dependent contacts, “Klixon” type, can disconnect the drive via
the external control or can be reported as an external fault on the frequency
inverter (programmable terminal).They can also be connected to the terminals
78 and 79 in order to have a specific error signal. In this case connect the
existing 1 Kohm resistor in series to the wiring. Note that one side of it must be
connected directly to terminal 79.
NOTE! The motor PTC interface circuit (or klixon) has to be considered and treated as
a signal circuit. The connections cables to the motor PTC must be made of
twisted pairs with a shield, the cable route should not be parallel to the motor
cable or at least 20 cm. away.
Current limitation of the frequency inverter
The current limitation can protect the motor from impermissible overloads. For
this the current limitation and the motor overload control function of the Drive
(B0H.00 - Motor OL control) must be set so that the current is kept within the
permissible range for the motor concerned.
NOTE! Remember that the current limitation can control an overheating of the motor
only due to overload, not due to insufficient ventilation. When the drive is operated
at low speeds the additional use of PTC resistors or temperature-dependent
contacts in the motor windings is recommended, unless separate forced
ventilation is available.
Output chokes
When using general purpose standard motors, output chokes are recommended
to protect winding isolation in some cases. See section 4.7.2, “ Output chokes”.
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