Fancom 771
INSTALLER: 4. Mounting and installation
6
The dosing valves in the houses can be controlled in the following three ways:
1. Directly by an IRM.16 (max. 448 valves)
2. Using the matrix by an IRM.64m (max. 600 valves)
3. Using the K.64 controlled by an IRM.16 (max. 600 valves)
1)
Connect the power supply for the dosing valves to the P-contacts of the IRM.16. Mains voltage
valves (for example 220 Volt) should be switched using a help relay.
2)
An IRM.64m is actually an IRM.16 + Matrix connection board. A 24Vdc control is present per
valve; there is no commom zero!
3)
An IRM.16 can control several K.64s. The description in point 1 also applies to the power
supply of the connected valves.
Mains voltage functions must always be controlled using a help relay.
During an alarm situation the alarm relay (relay 1 of the IRM.16 on address 1) will be switched off
(contact will be opened). An alarm message can be given using this relay to activate, for example, a siren,
an alarm unit or telephone dialler. For connection of the alarm circuit, refer to the connection diagrams
concerned in appendix 1.
The computer must give an alarm if there is a malfunction in the dry feed unit. The external alarm input on
the 771 computer is used for this purpose. The following alarm detectors can be installed on this external
alarm:
• Compressor air pressure switch
• Cable break registration
• Overflow protection for tanks, hopper and/or weigher
• Feed bin empty report
• Thermal contact of field switches
• External Emergency stop
The importance and application of the alarms above should be considered per individual unit.
The alarm contacts are connected in series and should break when an alarm situation occurs. As long as
the 2 external alarm input contacts are connected, the computer will see this as a non-alarm situation.
4.5 Connecting the valves
4.6 Connecting the mains voltage
4.7 Connecting the alarm circuit
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