Configuration Manual

Version Document
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001
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ccess V4.X Configuration manual
12 (56) 2018-07-11
transmitter (“Flow supply air”) is placed in the supply air fan cone, providing a
measurement of the supply air flow.
The supply air fan is controlled using the extract air flow as a setpoint. A scaling
factor can be added if the supply air fan does not have the same characteristics as
the extract air fan.
Configure: Configuration > Function Configuration > Fan control
Fans
 Supply+Extract
 Supply
 Extract
Flow presentation
 No
 Yes
Possibility to showing current flow on both fans even when pressure control or
slave control is used.
Alarm / Run indication
Digital input signals are used to supervise fans. They can be configured either for
indication of the motor running or for monitoring of motor alarm contacts.
An input configured for run indication should normally be closed during operation.
Open input when the motor is running, i.e. motor control output is activated, will
generate an alarm.
For supply air fans and extract air fans, there is also a conflict alarm, i. e. an alarm
if the run indication input is closed even though the motor control output is not
activated.
An input configured as motor protection should be normally open, i. e. closed
contact when the motor is running, i.e. motor control output is activated, will
generate an alarm.
When running frequency controlled fans, the pressure signal from each respective
fan’s pressure transmitter is normally used as run indication signal. If the pressure
falls below the set value during normal operation, a malfunction alarm is activated.
Alarm from frequency converter
When running frequency controlled fans, you sometimes want to use both a
pressure signal from a pressure transmitter and a digital alarm signal from a
frequency converter. An analogue input for a pressure transmitter and a digital
input for "Monitoring supply air fan" or "Monitoring extract air fan" must then be
configured. The setting Fan indication "Run indication/Alarm” on supply and
extract air fan must be set to "Alarm". A fan alarm will be activated both when
there is no pressure signal from the pressure transmitter, and when the digital
signal " Monitoring supply air fan " or " Monitoring extrct air fan " is activated.
Supply air fan indication
 None
 Alarm
 Run indication
Extract air fan indication
 None
 Alarm
 Run indication