Operating instructions

1-16 Introducing the Products Rexroth IndraDrive
DOK-INDRV*-FU*********-IB01-EN-P
Use a three-phase choke in the motor feed wire, if the inductance of the
third-party motor is smaller than indicated in the table above. This choke
has to increase the inductance that can be measured between two motor
terminals to the minimum value.
Note: When the inductance is measured, different inductance values
can be determined at different rotor positions within one pole
pair distance of the motor. The average value is relevant for
the check of the minimum value.
Correct values can only be determined when the motor is in
standstill!
Available third-party motor Planned third-party motor
U
V
W
Motor
L
U-Vmin
3x L
Dr
L
U-V
L
Dr
= 0,5 * (L
U-Vmin
- L
U-V
)
(inductance measurement with 1 kHz)
mounting of 3x L
Dr
(three-phase choke)
Calculating the leakage inductance
(asynchronous motor) or inductance
(synchronous motor) of the third-party
motor by means of the single-phase
equivalent circuit diagram
(manufacturer's specification!).
Determine choke by means of
calculation, if necessary.
It is recommended to contact Rexroth!
Requirements on the choke:
-I
n_Dr
≥ I
n_Mot
The rated current of the choke has to be greater than or equal to
the rated motor current.
- Depending on the maximum speed, the choke is loaded with the respective
output frequency and the PWM frequency of the controller.
- The insulation class has to correspond at least to that of the motor or
has to be dimensioned for higher temperatures.
- The voltage load of the choke depends on the controller used.
Fig. 1-13: Data for possibly required choke
Temperature Evaluation of Third-Party Motor
Only operate such motors with incorporated temperature sensor at
IndraDrive controllers so that the motor can be thermally monitored by the
controller and protected against destruction by too high temperature rise
(see P-0-0512, Temperature sensor).
When, in exceptional cases, you want to operate third-party motors
without temperature sensor at IndraDrive controllers, you must determine
the thermal time constants of motor housing (P-0-4035) and motor
winding (P-0-4034, P-0-4037). The firmware-internal motor temperature
model can thereby reflect the cooling situation of the motor correctly.
Note: In case the motor housing or blower is dirty, this worsens the
cooling situation of the motor and protection against thermal
overload is therefore insufficient!