As soon as an order is received, a compensation adds 2mA to
the calculated current to counteract the servo valve bias.
When there is no order, a -1.5mA current is added to the servo
valve bias effect in order to cause the spoilers to be more
pressed against the wing.
Case of spoilers performing LAF.
If the LAF is activated and if the difference between the
order and the position feedback exceeds 2.5 degrees, the servo
valve current is equal to 12mA.
2_ Monitoring of the servo valve current through comparison
between the calculated current and the measured current.
This monitoring is inhibited if the slaving is not active.
In the MON unit, there are two monitorings :
- monitoring of the orders generated in the two units.
- monitoring of the servo valve through :
monitoring of the spoiler position,
monitoring of the spoiler response to an order.
These monitorings are inhibited if the slaving is not active.
The MON unit cuts the servo valve current when the slaving is
not active.
R **ON A/C 051-051,
R (a) spoiler slaving
R (Ref. Fig. 037, 038)
R In the COM unit, there are two main functions :
R 1_ Generation of the servo valve current from the order and
R position feedback.
R As soon as an order is received, a compensation adds 2mA to
R the calculated current to counteract the servo valve bias.
R When there is no order, a -1.5mA current is added to the servo
R valve bias effect in order to cause the spoilers to be more
R pressed against the wing.
R 2_ Monitoring of the servo valve current through comparison
R between the calculated current and the measured current.
R This monitoring is inhibited if the slaving is not active.
R In the MON unit, there are two monitorings :
R - monitoring of the orders generated in the two units.
R - monitoring of the servo valve through :
R monitoring of the spoiler position,
R monitoring of the spoiler response to an order.
R These monitorings are inhibited if the slaving is not active.
R The MON unit cuts the servo valve current when the slaving is R not active.
R **ON A/C ALL
(b) Elevator slaving (Ref. Fig. 039) In the COM unit, there are two main functions :
-generation of the control current,
-
monitoring of this current through internal wraparound.
-
monitoring of the servo valve transducer (comparison between the servo valve current commanded by COM and the transducer position received by MON)
For the current generation, there is a compensation of the mechanical device which ensures the centering of the control surface. In the MON unit, the slaving monitoring function monitors the correct operation of the servo valve. This is to prevent runaways. The surface position is taken on the transducer unit elevator position.
(c) THS slaving (Ref. Fig. 040) In the COM unit, there are 3 functions :
-calculation of the deflection order depending on the Auto Trim function
-generation of the THS motor control current
-current monitoring through wraparound.
When the computer is not in charge of the THS slaving, the
slaving order is synchronized on the actual position of the THS.
In the MON unit, the monitoring of the THS position is made
through the comparison of the actual position with the
theoretical position.
The theoretical position is computed through the use of "images"
of the electric and hydraulic motors.
The monitoring functions are active only if the slaving is
engaged.
Elevator Servocontrol Slaving in the SEC R Figure 039
1EFF : ALL 1 27-94-00Page 55/56 1 1 Aug 01/04 1 1 1CES
Slaving of THS by the SECs R Figure 040
1EFF : ALL 1 27-94-00Page 57/58 1 1 Aug 01/04 1 1 1CES
(4)
ENGAGE LOGIC The ENGAGE LOGIC is processed in accordance with (Ref. Fig. 041)
(a) Purpose of the ENGAGE logic
-determination of the state of the computer : generation of SEC HEALTHY discrete. Each unit (or microprocessor) can open the output relays independently of the other
-control of all SEC relays : through relay K30 the power supply of all the other SEC relays can be cut off.
-illumination of the FAULT/ON/OFF pushbutton switch.
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