HygroMatik HPS250, Руководство по эксплуатации

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Page 41
Active humidity sensors require an external
supply voltage. Terminal 3 pr20 VDC
for that purpose.
11.6.3.2 Terminal wiring for a com-
bined unit (ordering option)
A combined unit allows for the alternative
operation of supply air humidification and
exhaust air cooling. The supply air humidifca-
tion mode supports all available control vari-
ants while the exhaust air cooling is always
run in 1-step mode. Switch-over between the
two alternative operational modes is accom-
plished by switch S3 on the terminal strip on
ST05 of the expansion board. For the
exhaust air cooling to become effective,
switch S2 must additionally be closed.
Switch S1 is not functional in exhaust air
cooling mode. It is used for activating 1-step
operation (S1 closed) in supply air humidifi-
cation mode.
Supply air humidification/exhaust air cooling
switch-over
The parameter „Digital_input_function“
(17:cylinder extension/1) must be set to „50“.
Switch-on of exhaust air cooling
Please note
3
45
6
7
GND
0...10V
Terminal strip on ST08
8
External controller
Terminal 4/5 wiring on the mainboard (terminal
strip on ST08) for connection of a 0...10V external
control signal
3
45
6
7
GND
8
Terminal 4/6 wiring on mainboard (terminal strip on
ST08) for connection of an external control signal
0...20mA
0...20mA
Terminalstrip on ST08
External controller
20 VDC
S3: NO contacts
Terminal strip on ST05
Terminal 3/8 wiring on the expansion board for
switching-over between supply air humidifica-
tion (S3 open) and exhaust air cooling (S3
closed), making use of digital input
3
45
6
7
8
S3
Switch-over
20 VDC
S2: NOcontacts
Terminal strip on ST08
Terminal 3/8 wiring on the mainboard (terminal
strip on ST08) für for switch-on of exhaust air
cooling (S2 closed). In order for S2 to become
effective, S3 on ST05 must be closed.
3
45
6
7
8
S2