Control for suction plants Type STW84V

The basic function of the device is to detect whether a current is flowing in the supply line of one of several woodworking machines. If a current flow is detected, the device opens a valve on the machine's suction channel. At the same time, the extraction system is switched on. When a machine is switched off, the device closes the associated valve with a delay. If the last machine is switched off, the extraction system also stops after a delay.

The current relay STW84V monitors up to 8 alternating current sets on current flow yes/no. The inputs can analyse signals of current transformers type STWA1(H) or of potential-free contacts.
For controlling of great dedusting plants several relays can be combined.

Applications
Controlling of dedusting plants in the timber and plastic processing industry according to the technical rules for dangerous materials TRGS 553. The central suction is switched on, as soon as any machine is put into operation. According slide-valves in the suction ducts of the individual machines are opened. In addition, cleaning of a filter (vibration) and a cellular wheel/discharge can be controlled, an external cleaning (with pressurized air) can be started or exceeding of max. volume flow can be reported. The analog output 0...10 V can control a frequency-converter at the motor of the ventilator and thus optimize performance and save energy.

• Monitoring of 8 machines (STWA1(H) or contact)
• input for "open all slide-valves"
• 8 relays (with change-over contacts) for slide-valves
• 1 relay for control ventilator
• 1 relay for filter-cleaning
• 1 relay for control of cellular wheel/discharge or report exceeding max. volume-flow
• analog output for control of frequency-converter and combination of more STW84V
• terminals pluggable
• universal supply voltage AC/DC 24-270 V