© STULZ GmbH, Hamburg
EN / 10-2015 / 1000683
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STULZUltraSonic-SystemforDirectRoomHumidificationBNB-
Open-loopandclosedloopcontrol
6.1.
Master/slave control cabinet for ultrasonic humidifier (USM/USS controller)
The USM controller is an open-loop and closed-loop control unit with inbuilt microprocessor for monitor-
ing,operatingandcontrollinganultrasonichumidifier,andforactuatingadditionalcontrolunits(USS)in
the same humidity control circuit.
Thecontrolpanelincludesamasterswitchforthepowersupplytotheultrasonichumidifier,fuses,anda
Siemens LOGO controller with display for setting and viewing current system values.
The display presents all the relevant data and factors as plain text and/or values. Alongside current hu-
midity,hereyoucanviewthecurrenthumidifiercapacity,operatingstateandspecifiedalarmmessages.
Thereasonforthealarmisdisplayed,whichsimplifiestroubleshooting.Inaddition,themainalarmsacti-
vateafloatingcontact,whichcanbeusedforforwardingalarmstoacentralcontrolcenter.
Types of control
The varied capability of the microprocessor allows different types of control to be used, which means that
controlconceptscansubsequentlybemodifiedwithoutanymajorsoftwareorhardwarechanges.
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Control via sensors:
Themicroprocessorrecordshumidityandadjuststheultrasonichumidifiers
proportionally. By modifying the parameter range, the humidifying system can be adapted to perfectly
suit requirements and ambient conditions.
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Control via external control signal:
The microprocessor processes a signal from an external con-
trollerandusesittoadjusttheultrasonichumidifierproportionally.
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Combination of humidity control and external control signal:
The microprocessor can process the
followingsignalsfortheinputoftheroomairsensororreturnairsensor,oranexternalcontrolsignal:
- 0-10 V DC, - 0-1 V DC, - 0.2 - 1 V DC, - 2 - 10 V DC, - optionally 4-20 mA with additional converter
(optionalcontrolcabinetaccessory).
In addition to the control inputs, the microprocessor features two inputs for remote ON/OFF actuation.
What's more, the microprocessor offers the option of actuating a solenoid valve with a supply voltage of
48 V AC. Flushing cycles can be set, so that not only is the water tank drained in the summer months,
butthepipesareflushedaswell.Thisensuresmaximumhygiene.
TVS(transientvoltagesuppression)diodesareswitchedparalleltothenebulizerprintplatesasprotec-
tion against overvoltage peaks.
The control units are fully wired and function tested at the factory.
