Stulz ENS 18 A - Master;slave control cabinet for ultrasonic humidifier (USM;USS controller)

DE / 06-2016 / 1000687 © STULZ GmbH, Hamburg
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Open-loop and closed loop control STULZ UltraSonic -System for duct humidication ENS 14 A - 18 A-
6.1. Master/slave control cabinet for ultrasonic humidier (USM/USS controller)
The USM controller is an open-loop and closed-loop control unit with inbuilt microprocessor for monitor-
ing, operating and controlling an ultrasonic humidier, and for actuating additional control units (USS) in
the same humidity control circuit.
The control panel includes a master switch for the power supply to the ultrasonic humidier, fuses, and a
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, here you can view the current humidier capacity, operating state and specied alarm messages.
The reason for the alarm is displayed, which simplies troubleshooting. In addition, the main alarms acti-
vate a oating contact, which can be used for forwarding alarms to a central control center.
Types of control
The varied capability of the microprocessor allows different types of control to be used, which means that
control concepts can subsequently be modied without any major software or hardware changes.
● Control via sensors: The microprocessor records humidity and adjusts the ultrasonic humidiers
proportionally. By modifying the parameter range, the humidifying system can be adapted to perfectly
suit requirements and ambient conditions.
● Control via external control signal: The microprocessor processes a signal from an external con-
troller and uses it to adjust the ultrasonic humidier proportionally.
● Combination of humidity control and external control signal: The microprocessor can process
the following signals for the input of the room air sensor or return air sensor, or an external control
signal:
• 0-10 V DC
• 0-1 V DC
• optionally 4-20 mA with additional converter (optional control cabinet accessory)
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,
but the pipes are ushed as well. This ensures maximum hygiene.
TVS (transient voltage suppression) diodes are switched parallel to the nebulizer print plates as protec-
tion against overvoltage peaks.
The control units are fully wired and function tested at the factory.