B&C Technologies DI-325 Industrial - Manual (Page 37)

OPERATING AND PROGRAMMING INSTRUCTIONS
8-6
the start button is pushed directly after that, message 14 can be displayed because the air flow
switch hasn’t reached the ‘off’ position yet.
Input 4: Input overload
This input should be used to connect all available motor overload protectors. The protectors
should be connected in series so that the input is ‘on’ when no overload protection is active. The
controller continuously checks this input and if the input is ‘off’, message 2 is displayed.
Input 5: Reserved
Not implemented yet. This input is reserved for future purposes.
Input 6: Reserved
Not implemented yet. This input is reserved for future purposes.
Input 7: Rotation sensor
This input is used to connect a drum rotation sensor. If the presence of a rotation sensor is
configured (see chapter ‘Configuration parameters’, parameter number 17), the controller checks
this input when the drum is running. This means that, if the drum is running, the rotation sensor
input should go from the ‘off’ to the ‘on’ state on a regular basis. The maximum time it may take
for the rotation sensor to be detected is adjustable with machine parameter 26 (see chapter ‘Machine
parameters’). If the drum speed is controlled by inverter and the analogue output of the controller,
the time-out duration is automatically compensated by the software. If the drum is running, and the
rotation sensor hasn’t been detected properly for too long, message 10 is displayed.
Please note that the rotation sensor can only be a sensor of the 24VDC type. If a 24VAC
type is used, this will not work and rotation alarms will be displayed continuously.
Input 8: Air pressure switch
This input is used to connect an air pressure switch to detect if enough air pressure is
available for the machine to be able to operate. The controller will continuously check input 8. If
enough air pressure is present, the input should be ‘on’. If the input is in the ‘off’ state, this means
not enough air pressure is present and the machine is not allowed to run. In this case, message 11 is
displayed. If no air pressure switch is connected, this input should be connected to 24V, so it is
always in the ‘on’ state.
Input 9: Overheating input
This input is used to connect an overheating switch. Usually, the overheating switch is wired
into the output circuit which goes to the heater. This is done for safety, so the heater can never be on
in case the overheating switch is active. If the overheating switch is connected to input 9 as well, the
heater output is fed back to the overheating input through the overheating switch, which can be seen
in the wiring example below.
Overheat
Input
Heater
Output
Overheating
Switch
Heater
Valve