Low Pressure Alarm; Leak Switch Alarm Specifications - Danfoss VACON NX Commissioning And Maintenance Manual

COMMISSIONING
The low temperature alarm
•
Activates a function that will activate the yellow indicator light on the HX-unit electrical box.
The parameter is set to 3
setting of the high-temperature shutoff is 22
•
When this alarm is activated the HX-
Exampl e, l ow temper atur e al ar m
The primary circuit temperature set point is set to 35 degrees, and then the low temperature alarm
should be set to 32 degrees.
Exampl e, al l temper atur e val ues
A primary circuit temperature set point of 35
temperature parameters should be adjusted the following way:
•
The primary circuit temperature set point (parameter P3.5) is set to 35
•
New over-temperature alarm value (parameter 2.10.9)
•
New low-temperature alarm value (parameter 2.10.8)
•
New over-temperature fault value (parameter 2.10.10)
The parameters are modified by using the HX Control box interface (VACON
Instructions on how to access and modify the parameters can be found in the VACON
Manual that is supplied with the HX-unit.
5.3.8 Low pr essur e alar m
The function of the pressure sensor placed on the pump suctions side is to give the user a warning of
low pressure before the FTSA11 flow switch generates a sudden unwanted shutdown. If there is a
leak in the primary circuit, outside of the HX-unit, the pressure starts to reduce in the system. The
set point for the pressure sensor is 0.5 bar, so if the pressure on the primary circuit suction side
goes under 0.5 bar the yellow indicator light on the electrical box will activate. The correct system
pre-pressure is found in the
If the suction pressure in the primary circuit is reduced due to a leak, the flow in
the circuit will within a short period of time be insufficient and therefore activate
a FTSA11 flow switch shutdown.
WARNING
The low-pressure parameter number is P2.10.4. Follow the instructions in the VACON
Manual on how to access and modify the parameters.
5.3.9 Leak switch alar m specifications
The leak sensor is a free standing sensor on to the leakage plate in the floor of the HX-unit. The
function of the switch is only to alert the user, by switching on the yellow alarm indicator placed on
the control box. The leak sensor generates an alarm if there is liquid on the floor plate inside the
HX-unit due to a leak in the unit. If there is condensation inside the HX-unit, the leak switch can
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C lower than the primary circuit temperature set point. The default

C has been calculated for a specific installation. The
chapter 5.1.7, Adding liquid and

C.
 
38 C
 
32 C
 
45 C
de-airing.
VACON 3 9

C
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NXP AC drive panel).
®
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