Project planning guide
cyber
®
reaction wheel 2
en-22
Doc. no.: 5022-D060586
Revision: 02
To activate the circuit module, the chopper control field must be set to "On". Afterwards, carry out
the voltage settings required for the application. Do you want to save the setting permanently?
In this case, click the button Save to EEPROM to maintain the settings even after a power failure.
The settings presented above causes switch T2 to be switched on by the Chopper_Enable signal
from the reaction wheel when the voltage threshold of 6.5 V is exceeded and be switched off
when the voltage falls below that threshold.
As soon as T2 is switched on, the energy feedback is converted into heat via resistors R27, R28,
R35 and R36.
For the target application, we recommend adopting the circuit module as long as no consumers
are connected to the supply system of the reaction wheels that can absorb the energy feedback.
•
Notice: The pin Chopper_Ena is activated in the example as of 6.5 V. For this reason, it must
be ensured that the supply voltage is always below the set threshold voltage while this
module is being used. Otherwise, the module or T2 is permanently activated,
which generates power loss and heating.
2.2.8 Environmental conditions
Environmental conditions
Unit
Value
Operating ambient temperature range
°C
0 … 40
Operating air humidity
%
< 95, non-condensing
Table 19: Ambient conditions of the cyber
®
reaction wheel starter kit
