Reflex iC60H, Reference Manual

Page: 31 / 44

Use
A9MA03EN 02/2012
31
Automatic Overheat Protection for the Reflex iC60 Integrated Control Circuit Breaker
Description
If the Reflex iC60 integrated control circuit breaker receives too many control orders in too short a time
period, overheat protection is automatically activated (Overheat) to limit the device’s potential
temperature rise and maintain its service life.
Remote control is then not possible and the status LED flashes rapidly orange.
This safety feature is automatically disabled when the device’s estimated temperature returns to a
satisfactory level. Control is then possible again. The status LED flashes green.
Operating Principle
The Reflex iC60 integrated control circuit breaker does not incorporate an internal temperature sensor.
Its temperature therefore cannot be measured; it can only be estimated by an algorithm that takes
account of the following criteria:
z The frequency of control orders
z
The cooling time between two control orders
The following diagram shows how overheat protection works on the Reflex iC60 integrated control circuit
breaker.
If the time between 2 commands is less than 20 seconds, the Reflex iC60 integrated control circuit
breaker is likely to switch to automatic overheat protection for a period of 5 to 25 seconds.
Activation of Overheat Protection
During normal operation of the Reflex iC60, overheat protection will hardly ever be activated, since circuit
breaker control does not require a high number of successive commands.
Overheat protection will be activated more frequently at the time the device is installed, or during the test
phase when it needs to be controlled more frequently.
Correct Use of the Reflex iC60 Integrated Control Circuit Breaker
Overheat protection is at its minimum level if the device has not received a control order within
20 minutes. It is then possible to carry out 12 successive contact open or close orders before overheat
protection is activated.
The Reflex iC60 can tolerate a rate of 1 contact opening/closing cycle every 30 seconds. If this frequency
increases, overheat protection is likely to activate automatically.
When overheat protection is activated for the first time, it lasts approximately 5 seconds. This duration
then increases to allow the device to cool between two successive control orders. The maximum duration
for overheat protection is 25 seconds.
NOTE: Cutting the power to the Reflex iC60 does not reset the overheat protection algorithm.
On
Ready
5 s ... 25 s 5 s ... 25 s
y
20 s
Reflex
iC60