Woodward ProAct P Series FL, Инструкция по установке, программированию и устранению неисправностей, Страница: 40 / 110

ProAct P-Series FL Position Controller Manual 26659
30 Woodward
Temperature Sensing
The ProAct P-Series FL has an on-board temperature sensor to monitor board
temperatures and protect the unit from over temperature as well as detect under
temperature. This temperature is monitored and a fault is annunciated if
temperature increases above 140 °C or falls below –45 °C. Internal monitoring
also provides temperature level indications for temperatures exceeding 100 °C
and 120 °C.
Current Limiting based on Temperature
The actuator provides actuator current limiting based on the electronics
temperature. Depending on board temperature and actuator thermal models, the
software reduces current as necessary to avoid conditions that would damage
the device due to extreme temperatures.
Current limiting based on temperature begins when the combined current and
temperature environment causes board temperatures greater than 100 °C. The
steady-state limit curve is a linear derate from full current at 100 °C down to zero
current at 140 °C. Depending on the current needed (actuator torque) and
ambient operating temperatures, the unit may never reach a reduced current
limiting condition. See Figure 3-4.
Figure 3-4. Example Temperature vs. Current Limit Curve
Alarms and Shutdowns
Power-up Diagnostics
The ProAct P-Series FL provides power up self-test diagnostics. The power-up
diagnostics takes less than one second to complete. This means that the
actuator is active within one second of power-up. A diagnostics error found
during power-up will shut down the actuator. There are a limited number of
power-up diagnostics, as most of the diagnostics are done during run time.
0
2
4
6
8
10
12
14
-50 0 50 100 150
Current (A
mps
)
Temperature (deg C)
Model II Current Limits
Transient Current Limit
Steady State Current
0
5
10
15
20
25
-50 0 50 100 150
Current (A
mps
)
Temperature (deg C)
Models III and IV Current Limits
Transient Current Limit
Steady State Current