—————— TPD32-EV ——————
58
2.6 MOTORS, ENCODER, TACHOMETER
The converters of the TPD32-EV series are provided for the regulation of DC motors with an independent exci
-
tation. As for speed feedback there is the use of a sinusoidal incremental encoder, a digital encoder or an analog
tachometer generator. In case of limited precision needs it is possible to use as feedback the armature voltage
without defluxing.
2.6.1 Motors
The electrical and mechanical data of the dc motors with an independent excitation refer to a particular function
-
ing field. The following points have to be taken into consideration in order to operate these motors:
Motor data necessary to connect it to a converter
The data on the motor nameplate:
- Armature rated voltage
- Armature rated current
- Field rated current
- Motor rated speed
Motor protection
Thermo relay of the motor
- Placed above the converter: dimensioning I
dN
• 0.82 • 1.05
- The relay contact can stop the drive through a control circuit or it can signal to the converter as an external
failure (terminal 15).
n
ote
!
Remember that with a thermo relay it is possible only to control the heating of the motor due
to an overload, but not the one due to an insufficient ventilation. For this purpose some PTC
thermistors or thermal switches should be inserted in the motor windings.
Thermistors and thermal switches
On terminals 78 and 79 it is possible to connect a thermistor or thermal switch in order to detect motor overheat
-
ing. When no temperature sensors are present an external resistor (R = 1 kohm) has to be connected to these
terminals. The connection of the sensor has to be done according the following instructions.
Thermistors (PTC)
PTC thermistors according to DIN 44081 or 44082 fitted in the motor can be connected directly to the converter vie
terminals 78 and 79. In this case the resistor (1 kohm) mounted between the terminals 78, 79 has to be removed.
Thermal switches (klixons) in the motor windings
Temperature-dependent contacts “klixon” type can disconnect the drive via the external control or can be reported
as an external error on the converter (terminal 15). They can also be connected to the terminals 78 and 79 in
order to have a specific error signal. In this case remove the 1 kohm resistor from these terminals and connect
it in series to the wiring.
Limitation of the converter current
The current limitation can protect the motor from unwanted overloads. To this purpose it is necessary to set
the current limitation and the control function of the converter overload (overload function), so that the current
remains within the values allowed for the motor.
n
ote
!
Remember that with a current limitation it is possible to control only the motor heating due
to an overload, but not the one due to an insufficient ventilation. For this purpose some PTC
thermistors or thermal switches should be inserted in the motor windings.
Содержание TPD32-EV-...-2B
Страница 1: ... Instruction manual Industrial Application DC drives TPD32 EV ...
Страница 62: ... TPD32 EV 62 10 mm 0 4 150 mm 6 150 mm 6 150 mm 6 10 mm 0 4 10 mm 0 4 50 mm 2 Figure 3 3 2 Mounting Clearance ...
Страница 372: ... TPD32 EV 372 9 BLOCK DIAGRAM 9 1 CONTROL BLOCK DIAGRAMS ...
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