Temperature Alarms And Shutoffs - Danfoss VACON NX Commissioning And Maintenance Manual

5 2 VACON
7.1.2 Temper atur e alar ms and shutoffs
If the high temper atur e al ar m is active (acc. to panel below) the HX-unit is still online and the
electrical box door are also active. Check the following issues to solve why the alarm has been
activated:
RUN
F1.
I/ O ter m
83 OverTempA
A T1 T16
Mal function
The flow in
secondary circuit is
too low.
The temperature of
the secondary circuit
liquid is too high.
The regulating valve
V130 is
malfunctioning
Table 7.1-2 High temperature fault detection
7
READY ALARM

Figure 7.1-2, High temperature alarm on the NXP panel
Reasons for mal function
•
the The customer
outside the HX-unit, MF21
(refer to the P&ID) is
clogged.
•
The plate heat exchanger
HX11 (refer to the P&ID) is
clogged on the secondary
side.
•
The customer pump in the
secondary circuit is
malfunctioning and
therefore not able to
produce enough flow.
Maintaining the HX-unit cannot
solve the reason for this
malfunction.
•
The 3-way valve V130 is
malfunctioning
therefore
enough flow through the
plate heat exchanger to
ensure a satisfactory heat
transfer between
primary and
circuit.
•
The FTSA11 setup values
have been wrongly
adjusted during
commissioning.
Local contacts: http:/ / dr ives.danfoss.com/ danfoss- dr ives/ local - contacts/
Cor r ection measur es
filter, Clean the filter.
Clean the heat exchanger. Refer to the
cleaning instructions found in the
HX-unit folder that is supplied with
the unit. Instructions on how to
remove the plate heat exchanger
are found in
exchanger.
Maintain or replace the customer circuit
pump.
The temperature of the liquid in the
secondary circuit inlet has to be 5
degrees lower than the primary
circuit temperature set point, e.g. if
the primary circuit temperature set
point is set to 35°C then the
secondary circuit inlet temperature
must be 30°C or lower.
Run the actuator calibration according
and to the instructions found in the HX-
unit manual that is supplied with the
not directing
unit, i.e. set the actuator Dip-switch
not moving during this procedure it
is broken and has to be replaced.
the
secondary
Check the project parameters (refer
Table 5.3-1, Parameter list) and
compare
temperature.
TROUBLESHOOTI NG
chapter 6.2.2, Heat
it with the actual