Thermal Motor Protection; Cooling Mode - Bosch Rexroth MS2E Manual

32 / 70
Features and functions
Table 11: Tightening torque of mounting screws
Screw
Mounting holes ⌀ [mm]
Tightening torque M [Nm] at μ
A
Washer DIN EN ISO 28738
1. Use specified screws and washers for fas-
tening the motors.
2. Tighten the screws with the specified
torque.
6.2.3

Thermal motor protection

The motor temperature is monitored by two sys-
tems that are operated independently of each
other. The mounted temperature sensor and the
drive-internal temperature model ensure the best
protection of motors against thermal overload.
The threshold values for motor temperature mon-
itoring are contained in the encoder data memory
and are read in and monitored automatically
during the operation with Rexroth controllers.
Threshold values for MS2E motors are:
•
Motor-warning temperature (125°C)
•
Motor-disconnection temperature (130°C)
Table 12: MS2E temperature sensor
Motor Temperature sensor
MS2EXX-XXXXX- PT1000
XXXXX-XXNXX-XX
PT1000
1700
1600
1500
1400
1300
1200
1100
1000
900
0 10 20 30 40 50 60 70
Fig. 3: Characteristic curve PT1000
Bosch Rexroth AG
M4
4.5
= 0.12 3.0
K
-
R
80 90 100 110 120 130 140 150 160 170
°C
MS2E Synchronous Servomotors
M6 M8 M10
6.6 9 11
10.1 24.6 48
- yes yes
In case of motors with digital encoder (E/F), the
resistance values are transmitted digitally via the
encoder interface (cyclic communication).
6.2.4

Cooling mode

Self-cooling (IC410)
In case of self-cooling motors, the heat dissipa-
tion is realized via natural convection and radia-
tion to the ambient air as well as by heat conduc-
tion to the machine construction.
The specified nominal data is reached at ambient
temperatures of up to 40 °C. Unhindered vertical
convection has to be ensured by a sufficient dis-
tance of 100 mm to adjacent components. Any
usage at increased ambient temperature (0 ...
60°C) is possible. Please note the details in
⮫ Chapter 9.5 "Derating in case of deviating
ambient conditions." on page
Pollution of the surface of the motor reduces heat
dissipation and can result in thermal overload.
The availability of the system can be increased by
regular checks and cleaning of the motors. Please
ensure access to the motors for maintenance pur-
poses.
M12 M14
14 18
84 206
yes yes
55.
R911387136, Edition 03