Note:
The following functions are not an option with all actuators – see Fig: 5.2.
Partial Stroke The actuator will move the valve to an intermediate position and back
to the start position provided it is at the correct end of travel position
when the command is issued. The end to start from and the amount of
travel are selected by parameters in the transducer block.
Relay Output 1 to 4
These 4 commands are used to energise and de-energise the internal
relays on the additional relay board (if fitted). (These outputs are
referred to as S5-S8 in the standard actuator documentation when
there is no FF CP card in the actuator). The resulting outputs can be
used for operating other equipment such as a pump or indication light.
The actuator itself is not able to control these relays directly from the
main board when the FF CP card is fitted; they may only be controlled
by the DO blocks. They will maintain their last state if power is
removed from the actuator. On restoration of power, the relays will be
reset to their de-energised condition.
Hard-Wired Open and Close
These commands operate the actuator in the same way as the open
and close commands sent over the Foundation highway, assuming
the auxiliary input mask has been set correctly.
Hard-Wired Stop The hard-wired stop input acts as a change of state input. If the
actuator is moving, opening the Stop input will stop the actuator. If the
Stop input is already open and a Foundation DO command is sent to
the actuator, the Foundation command will be initiated. To stop the
actuator the hard-wired input must be closed and opened again.
Hard-wired ESD (Network Disable)
The hard-wired ESD may be set to causes the actuator to drive to its
Emergency position. Alternatively, the input can be used to disable
Foundation network control. The function of the input is determined by
a parameter in the transducer block.
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