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 24-240 V
• Accessory: Installation frame ER8 for panel mount

Overview of functions

Functions/adjustments

• run-after last slide-valve 0... 99 s
• turn-off delay ventilator 0...99 s
• minimum volume-flow 1...100 %, (if necessary automatic opening of additional slide-valves, beginning with K8)
• maximum volume-flow 5... 100 %

Individually adjustable per channel

• turn-on-delay I1... I8: 0... 20 s
• turn-off-delay relay K1...K8: 0... 99 s
• operating value I1...I8: app. 0.5... 5 A
• volume-flow of slide-valves 1...100 %

Combination of more STW84V
Master-relay considers volume-flow of other relays for

• control of suction-fan (relay K9 and analog output 0-10 V)
• opening of additional slide-valves
• adding time for filter-cleaning
• report of exceeding max. volume-flow

Control of cleaning (dedusting) of filters

The run time of the suction is added with consideration of the volume flow. The dedusting of the filters is started after the programmed time is reached (starts only with when suction off).

• time for addition: 0... 99 min.
• added time stored permanently even at loss of power (power failure or upon completion of work)
• delay before start of dedusting: 0... 990 s
• number of dedusting impulses: 0... 20
• impulse-on-time: 1... 30 s
• impulse-off-time: 1... 990 s
• time of continuous dedusting: 0... 990 s
• alternatively impulse shaking 0.1... 9.9 s (square)
• alternatively request for external dedusting (with running suction)
• input for external dedusting command (after next stop of suction)
• controlling a cellular wheel / discharge during dedusting

Displays and operation

• 7-segment-display for settings during programming, in operation display of the volume flow
• 8 LEDs for input/output selection and display of the active inputs/outputs
• 9 LEDs for function selection
• easy programming