DriSteem Vapor-Logic Guía de instalación descargar pdf (Pagina 26)

For a large humidification load, when the application

dictates a single humidifier with multiple outputs and/or

multiple humidifiers electrically tied together in a very

large common system, the time proportioning action is

still the same as the humidifying single output, except

that the additional electrical humidifying outputs are

sequenced on or off as demand signal dictates. The

additional outputs are turned on (100%) and off (0%) at

a rate equal to the delay time. The delay time has a

range of 4 to 99 seconds. The VAPOR-LOGIC default

is 20 seconds. See figure 26-1.

Example of Operation

Cycle Rate: 30 seconds

Delay Rate: 20 seconds

Control Span: 6-9 VDC

Input Signal: 1-15 VDC controller or humidistat

Time proportioning of the humidifier load takes place

only when the humidistat output signal is within 6 to 9

VDC range. As the signal drops below 6 VDC, the time

proportioning heater turns off and stages any additional

heaters off, one heater for every 20 second delay

period the signal remains below 6 VDC. As the

humidifier signal increases to 9 VDC, the time

proportioning heater will increase to 100% output; on

multiple heater applications at the point where the

demand exceeds 9 VDC, the time proportioned heater

will reset to zero output and turn on the first staged

output to 100%. For every 20 second delay period that

the signal is above 9 VDC, an additional staged output

will be energized, with the time proportioned output re-

energized as the last stage when a full output demand

is requested. As the humidistat signal stabilizes within

the throttling range (6-9 VDC), the modulated output

will continue to humidify on single output humidifiers

and will also continue to modulate with any combination

of additional staged outputs on multiple heater

systems.

Standard Control Input Signals

• 4-20 mA (throttling range or control span 5-19 mA)

• 1-15 VDC (throttling range or control span 6-9 VDC)

• 0-135 ohms (throttling range or control span 17-117

Ohms)

VAPOR-LOGIC

CONTROL SCHEMES

Area where additional outputs are

turned on based on the delay time in

seconds

Area where additional outputs are

turned off based on the delay time

in seconds

Time

Multiple Output Control

Desired

Set-point

Humidity % RH

Control

Signal (by

others)

Low Demand

5-4 mA

17-0 Ohms

6-1 VDC

High Demand

Throttling Range (symmetrical around

Set-point)

20-19 mA

135-117

Ohms

Control Span

Figure 26-1: Time Proportioned On-Off (control signal by others)

OM-589

15-9 VDC

1 2 ... 21 22 23 24 25 26 27 28 29 30 31 ... 51 52

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DriSteem Vapor-Logic Guía de instalación Pagina 26

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