34
Operating Instructions – Explosion-Proof CMP Synchronous Servomotors
5
Thermal motor protection
Electrical Installation
5.10 Thermal motor protection
KTY temperature sensor
The following figure shows the resistance of the KTY sensor subject to the motor tem-
perature. The characteristic curve shows the resistance curve with a measuring current
of 2 mA and correct pole connection.
For detailed information on connecting the KTY, refer to the contact assignments of the
resolver/encoder cable. Observe the correct polarity.
NOTE ON EXPLOSION PROTECTION
Due to the low thermal time constants of the winding, a thermal motor protection is only
achieved if the motor current is limited on the basis of the following criteria:
• Measured values of the KTY temperature sensor
• In addition, a motor model for thermal protection must be activated as it is the case
with SEW inverters. This motor model must match the respective servomotor.
STOP!
Incorrect connection may cause damage to the temperature sensor and the mo-
tor winding!
Avoid currents > 4 mA in the circuit of the KTY since high self-heating of the tempera-
ture sensor can damage its insulation and the motor winding.
It is essential to observe the correct connection of the KTY to ensure correct evaluation
of the temperature sensor.
50927AXX
2000
1800
1600
1400
1200
1000
0
200
-40
-20
0
40
60
80
100
120
140
160
180
200
20
400
600
800
R [
Ω
]
ϑ
[°C]
Summary of Contents for CMP40
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