7 Operation
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Hya-Duo D FL
7.3 Functions
7.3.1 Automatic switchover (duty system and back-up system)
If the duty system fails (motor protection switch or phase monitoring tripped, 24 V
supply interrupted or control transformer failed), operation automatically switches
from the duty system to the back-up system.
Table 12:
What to do in the event of a failure
Duty system fault
Back-up system fault
Response of pressure booster system
Motor protection switch tripped Motor protection switch tripped Back-up system ready for operation
24 V supply interrupted
Back-up system starts up
Control voltage interrupted
Switchover back to duty system
Duty system ready for operation
Failure phase monitoring
Switchover back to duty system
Duty system ready for operation
24 V supply interrupted
Motor protection switch tripped Back-up system ready for operation
24 V supply interrupted
Back-up system starts up
Control voltage interrupted
Switchover back to duty system
Duty system starts up
Failure phase monitoring
Switchover back to duty system
Duty system starts up
Control voltage interrupted
Motor protection switch tripped Back-up system ready for operation
24 V supply interrupted
Back-up system starts up
Control voltage interrupted
Switchover back to duty system
Pressure booster system no longer ready for
operation
Failure phase monitoring
Switchover back to duty system
Pressure booster system no longer ready for
operation
Failure phase monitoring
Motor protection switch tripped Back-up system ready for operation
24 V supply interrupted
Back-up system starts up
Control voltage interrupted
Switchover back to duty system
Pressure booster system no longer ready for
operation
Failure phase monitoring
Switchover back to duty system
Pressure booster system no longer ready for
operation
7.3.2 Dry running protection
In the following cases, dry running protection is active in manual mode and during a
test run:
▪
The discharge-side pressure is not below the start-up pressure p.
E
▪
The fire-fighting system is started up via the remote ON/OFF contact.
Both cases are interpreted as an event of fire. In the event of fire, the system's
protective features must be disabled.
A digital input is provided for connecting the dry running protection device. When
the input is open, the control unit detects dry running and stops the fire-fighting
system after approx. 10 seconds (factory setting).
7.3.3 Temperature monitoring
To protect the pump sets against overheating during operation without minimum
flow rate a temperature sensor is fitted on the pump shroud. The temperature sensor
opens the solenoid valve in the by-pass line when a specific fluid temperature
(factory-set to 65 °C) is exceeded. Temperature monitoring is enabled in automatic
mode and manual mode.
