9.8
Motor temperature monitoring
Failure in the machine or damage by improp‐
er use of the sensors!
CAUTION
●
The PTC sensors are no safety devices and are not intended for inte‐
gration into safety systems to protect persons or machines.
●
The PTC sensors are neither designed nor intended for measuring the
temperatures of the housing, rotor or motor bearing. Additional tempera‐
ture control requirements have to be realized by the machine manufac‐
turer.
●
To ensure safe motor protection against thermal overload, the tempera‐
ture sensor SNM.150.DK has to be connected to the drive controller.
●
The used temperature sensors are equipped with double or reinforced
insulation according to DIN EN 50178, so separation exists according to
DIN EN 61800-5-1.
Stators of synchronous torque motors type MBT are provided with integrated
temperature sensors for motor protection by default. Each motor phase con‐
tains one of three ceramic PTCs connected in series to enable reliable ther‐
mal monitoring of the motor in every phase of operation. These temperature
sensors (referred to as motor protection temperature sensor below) have a
switching characteristic (
chapter 9.7.6 "Dimensioning the cooling circuit" on
) and are evaluated at all Rexroth drive controllers.
Furthermore all stators feature an additional temperature sensor for tempera‐
ture measurement. This sensor (referred to as Temperature measurement
sensor below) has an approximately linear characteristic curve (see
"Characteristic temperature sensor KTY84-130" on page 278
).
Motor protection temperature sen‐
sor
Type
PTC SNM.150.DK.***
Rated response temperature
ϑ
NAT
150 °C
Resistance at 25 °C
≈ 100 ... 250 Ohm
Tab. 9-8:
Motor protection temperature sensor
MBT High Synchronous Torque Motors
277/409
Application notes
R911298798_Edition 08 Bosch Rexroth AG
Содержание rexroth MBT
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