49 – Pvd3675_Gb_Ey_Septembre_2017
3.7. Thermal Protection
Different protections against thermal overloading of the motor are proposed:
Thermoswitches (as an option), PTC thermistors (as standard) or KTY temperature (as
an option) built into the stator winding. The thermal sensors, due to their thermal inertia,
are unable to follow very fast winding temperature variations. They acheive their thermal
steady state after a few minutes.
Warning: To protect correctly the motor against very fast overload,
please refer to §3.1.6. Peak current limitations
3.7.1. Alarm tripping with PTC thermistors
Once thermal probe (PTC thermistors) fitted in the EY servomotor winding, trips the
electronic system at
150°
±
5° C
for class F version. When the rated tripping temperature
is reached, the PTC thermistor undergoes a step change in resistance. This means that
a limit can be easily and reliably detected by the drive.
The graph and tab below show PTC sensor resistance as a function of temperature (T
N
is nominal temperature)
Temperature
Resistance value for
EY6 andEY8
Resistance value for
EY3 andEY4
from -20°C to T
N
-20°C
R1≤500 Ω
R1≤750 Ω
from T
N
-20°C to T
N
-5°C
R2≤1100 Ω
R2≤1650 Ω
from T
N
+5°C to T
N
+15°C
R3≥2660 Ω
R3≥3990 Ω
greater than T
N
+15°C
R4≥8000 Ω
R4≥12000 Ω
R4
Re
sistance (Ω)
R3
R2
R1
T
N
-
20°
C
T
N
-
5
°C
T
N
+5
°C
T
N
+
15°
C
Temperature (°C)
-20°
C
Summary of Contents for EY Series
Page 1: ...1 Pvd3675_Gb_Ey_Septembre_2017 Servomotors EY Series Technical Manual PVD 3675 EY Series...
Page 37: ...37 Pvd3675_Gb_Ey_Septembre_2017 3 3 Outline drawings 3 3 1 EY310E...
Page 38: ...38 Pvd3675_Gb_Ey_Septembre_2017 3 3 2 EY420E EY430E...
Page 39: ...39 Pvd3675_Gb_Ey_Septembre_2017 3 3 3 EY620E EY630E...
Page 40: ...40 Pvd3675_Gb_Ey_Septembre_2017 3 3 4 EY820E EY840E EY860E...
Page 44: ...44 Pvd3675_Gb_Ey_Septembre_2017 3 5 2 2 EY420 3 5 2 3 EY430...
Page 45: ...45 Pvd3675_Gb_Ey_Septembre_2017 3 5 2 4 EY620 3 5 2 5 EY630...
Page 46: ...46 Pvd3675_Gb_Ey_Septembre_2017 3 5 2 6 EY820 3 5 2 7 EY840...
Page 47: ...47 Pvd3675_Gb_Ey_Septembre_2017 3 5 2 8 EY860...
