Automated Logic ZN551 Technische instructies - Pagina 12
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Using flow sensors
To connect the duct
tubes to the flow sensors
To wire the flow sensor
to the control module
To set up the Airflow
Control microblock
ZN551 Control Module • Rev. 3/17/2005
Offset/Polarity
Notes
Digital (Binary) Input
Polarity determines the microblock's present value when no
(BBI)
signal is received from the equipment.
When no signal is received from the equipment, if Polarity is
set to:
normal—present value is off
reversed—present value is on
Digital (Binary) Output
Polarity determines the ZN551's output based on the control
(BBO)
program's signal to the microblock.
When the control program's signal to the microblock is on, if
Polarity is set to:
normal—output is on
reversed—output is off
NOTE Regardless of Polarity, the output will be off if the
ZN551 loses power.
In a single duct system, the ZN551 controls airflow in the zone using a USF
flow sensor and an actuator connected to two digital outputs.
In a dual duct system, the ZN551 controls airflow in the zone using a UDF
flow sensor and two actuators, with each actuator connected to two digital
outputs.
USF
Connect the duct's total pressure tube to the USF's High connector.
1
2
Connect the duct's static pressure tube to the USF's Low connector.
UDF
Follow the procedure for a USF, but connect one duct's tubes to the UDF's
Flow #1 connectors and the other duct's tubes to the UDF's Flow #2
connectors.
Use the cable included with the flow sensor (ALC part #235012) or a 20 AWG,
4-conductor cable, maximum length 4 feet (1.22 meters).
Turn off the control module's power.
1
2
Connect the ends of the cable to the 4-pin connector on the flow sensor
and to the 4-pin connector on the control module.
The ZN551's control program must include one Airflow Control microblock
for a single duct system or two of the microblocks for a dual duct system.
You must set up the Airflow Control microblock for each flow sensor.
12
© 2005 Automated Logic Corporation