Stulz ENS 18 A - Open-loop and closed loop control

© STULZ GmbH, Hamburg DE / 06-2016 / 1000687
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STULZ UltraSonic -System for duct humidication ENS 14 A - 18 A- Open-loop and closed loop control
Selecting the required actuation system
Required control Type of control Possible components
Humidity measurement with
actual value/setpoint comparison
Proportional control
With proportional control, the
actual value is compared with
the setpoint, and the humidifying
output is adapted in line with the
resulting difference.
USM/USS controller
External control with
control signal 0-10V DC / 0-1V
DC
Proportional control
USM/USS controller or
proportional control accessory set
External control with
remote ON/OFF contact
ON/OFF control
The most simple form of control
is achieved by a hygrostat, which
compares the room humidity (ac-
tual value) with the setpoint. The
control keeps values around the
setpoint with a preset switching
hysteresis.
USM/USS controller or
ON/OFF control accessory set
or ON/OFF control module
6. Open-loop and closed loop control
An external switch gear cabinet is required to operate the UltraSonic humidier. In addition to the trans-
former required for operation, the switch gear cabinet must also house contactor relays, the master
switch, terminal strips and, if applicable, the proportional adapter, controller or conductivity measuring
equipment.
Closed-loop control of the ultrasonic humidier can take the form of either two-point (ON/OFF) or propor-
tional control. The control must be adapted as necessary for the project in question.
CAUTION
Danger of death. Electric shock risk.
Faulty wiring of the switch gear cabinet can cause the humidier to become defective.
The STULZ UltraSonic ENS ultrasonic humidier may only be installed, connected and started up by
specialist electricians.
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Switch gear cabinets must be wired as shown in the wiring diagrams provided.
WARNINGDANGER
CAUTION
Control and unit sizes.
Possible combinations of individual controllers with unit sizes are presented in section "4.5. Technical
data" on page 16.
Note
CAUTION
Technical documentation to download.
Technical documentation is available for you to download. Visit our web site at www.stulz.com.
Note
CAUTION
Danger of death. Fire risk.
Operating the humidier without the external airow carries a risk of re.
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Always operate the humidier with the external airow.
WARNINGDANGER