FCU 500, FCU 505 · Edition 02.17 18
Function
Terminal Type Designation Function
45
Safety circuit input
Valve proving system
Connection for the sensor of the valve proving system (tightness control pressure switch or
POC switch for checking the closed position).
46 Controller enable/emergency stop
Connection for higher-level safety devices and interlocks (e.g. emergency stop, safety
temperature monitor), see Parameter 10
47 Minimum air pressure
Connection for pressure switch to monitor the minimum air pressure, see
Parameter 15
48 Minimum air flow
Connection for a sensor to monitor the minimum air flow during pre-purge or post-purge,
see Parameters 35, 38
49 Minimum gas pressure Connection for pressure switch to monitor the minimum gas pressure, see Parameter 13
50 Maximum gas pressure Connection for pressure switch to monitor the maximum gas pressure, see Parameter 12
51, 65,
66, 67,
68
Programmable inputs
The terminals can be assigned a function using parameters. To do so, logical AND gatings
with terminals 46, 47, 48, 49 or 50 are possible.
52
Feedback from actuator/frequency
converter
Connection for the position feedback signal from the actuator/frequency converter
53, 54,
55, 56
V AC output
Capacity control
Connection for capacity control using an actuator or frequency converter,
see Parameter 40 to 47
58 Fan
Connection for fan control. Alternatively, this output can be used to activate a valve to check
the function of the air pressure switch.
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