Santerno Sinus Penta - Motor Thermal Protection Menu

SINUS PENTA
PROGRAMMING GUIDE
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44. MOTOR THERMAL PROTECTION MENU
44.1. Overview
The Motor Thermal Protection function protects the motor against overloads.
Some Sinus Penta models offer the possibility to set the heatsink temperature for the activation of cooling fans.
All relevant parameters are included in the Motor Thermal Protection menu.
NOTE
Each connected motor has its own thermal model.
If the drive is used to control only one motor and its control mode is selected through the
selection of the different motors
, the motor thermal protection is ensured by setting PTC
protection for all motors.
For each programmable motor, thermal protection can be configured in 4 modes, which can be selected with parameter
C265 (or C268 or C271 for motor 2 and 3 respectively), depending on the cooling system being used (configuration
modes 1, 2 and 3):
Value Descr.
IEC 34-6
Compliance
Description
0:NO
[NO]
-
The Motor Thermal Protection function is disabled;
1:YES
[No
Derated]
IC410
The Motor Thermal Protection function is active with trip current It independent of
operating speed (No derating);
2:YES
A
[Forced
Cooled]
IC411
The Motor Thermal Protection function is active with trip current It depending on
operating speed, with fan-cooled motor de-rating (Forced Cooling);
3:
YES
B
[Fan Shaft]
IC416
The Motor Thermal Protection function is active; trip current It depends on
operating speed and de-rating is suitable for motors having a fan keyed to the
shaft (Fan on Shaft) (factory setting).
When C265=1, 2 and 3, the motor thermal model is considered. The heating of a motor is proportional to the square of
the current flowing (I
o
2
). The Motor overheated alarm (A075) will trip after the time “t” computed based on the motor
thermal model is over.
The alarm can be reset only after a given time depending on the thermal constant (C267) of the motor, thus allowing for
the correct cooling of the motor.
Figure 66: Trip current drop depending on speed values