54 / 74
MKE Synchronous Servomotors
Operation on foreign converters
Bosch Rexroth AG
R911402016, Edition 02
the systems is not object of these Operating
Instructions; instead, it is carried out within the
framework of the commissioning of the machine
as a whole. Comply with the information and
instructions of the machine manufacturer.
9.4
Operation
During operation, keep the ambient and opera-
tion conditions and technical data specified in
the operating instruction and project planning
manual.
Checks during operation:
•
Pay attention to exceptional noise.
•
Pay attention to increased vibrations.
•
Check the motor for cleanliness.
•
Check the monitoring devices and diag-
nostic / error messages of the controllers.
Decommission the drive when deviations from
normal operation exist. For further procedure
refer to
Chapter 13 “Eliminate malfunction ”
9.5
Operation on foreign con-
verters
Principally, operating MKE motors on foreign con-
verters is possible, but the following require-
ments and limitations on foreign converters must
be observed.
WARNING
Danger of explosion or material damage due to
overload!
Observe the following requirements for safe
motor operation on foreign converters. Connec-
tion of all necessary sensors and additional
devices for a safe operation and their evaluation
lies in the sole responsibility of the plant manu-
facturer or operator.
Requirements on the power output stage
•
Converter with pulse width modulation
•
Pulse frequency 4 kHz …16 kHz
Voltage load of the motor
During converter operation, the motor underlies
a higher voltage load (insulation system, bearing)
than on a sinusoidal source voltage only.
Standard values for peak voltage and rate of rise
of voltage:
•
Peak voltage U
pk
on motor clamps ≤ 1.56 kV
•
Rate of rise of voltage du/dt ≤ 5 kV/μs
Maximum allowed limit load:
In the case of critical rate of rise of off-state
voltage du/dt ≥
5
kV/µs, the limit values (peak
voltage, voltage rise time) according to limit
curves A according to DIN
VDE
0530-25
(VDE
0530-25):2009-08 (Figure 14 Limit curve A)
must be kept. Therefore, observe the limit values
for voltage rise time and critical rate of rise of off-
state voltage.
Limit values for voltage rise time and critical rate
of rise of off-state voltage:
•
Voltage rise time >
0.17
µs
•
Critical rate of rise of off-state voltage du/dt
<
8 kV/µs
Monitoring functions
•
Speed monitoring of maximum permissible
speed
•
The motor load must not exceed the allowed
continuous operation characteristic curve.
The converter setting data for controlling and
monitoring must comply with the type code
data.
•
Connect and evaluate the temperature
sensor of the motor winding (ensure moni-
toring function, limit switch-off tempera-
ture).
Depending on the converter used, function-
tested triggering devices with the II 2 G or
II 2 D designation may be required to
evaluate the temperature sensors. For sup-
plementary information on temperature mon-
itoring, see EN60079-14:2014.
