Miscellaneous - Danfoss AK-LM 330 Design Manual

Miscellaneous

Main switch
The main switch is used to stop and start the controlling function.
The switch-over has 2 positions:
- Normal controlling state (Setting = ON)
- Control stopped. (Setting = OFF)
If the main switch is set at OFF, all the control's functions are
inactive and an alarm is generated to draw attention to this – all
other alarms cease.
Sensor calibration:
The input signal from all connected sensors can be corrected. A
correction will only be necessary if the sensor cable is long and
has a small cross-sectional area. All displays and functions will
reflect the corrected value.
Clock function
The controller contains a clock function.
The clock function is used by the Log function.
The year, month, date, hour and minutes must be set.
Note: If the controller is not equipped with a RTC module
(AK-OB 101A) the clock must be reset after each mains voltage
outage.
If the controller is connected to an installation with an AKA-
gateway or an AK system manager, this will automatically reset
the clock function.
Alarms and messages
In connection with the controller's functions, there are a number
of alarms and messages that become visible in cases of fault or
erroneous operation.
Alarm history:
The controller contains an alarm history (log) that contains all
active alarms as well as the last 40 historical alarms. In the alarm
history you can see when the alarm began and when it stopped.
In addition, one can see the priority of each alarm as well as when
the alarm has been acknowledged and by which user.
Alarm priority:
Differentiation is made between important and not-so-important
information. The importance – or priority – is set for some alarms
whilst others can be changed voluntarily (this change can only
be done with attachment of AK-ST service tool software to the
system and settings must be made in each individual controller).
The setting decides which sorting / action must be carried out
when an alarm is sounded.
• "High" is the most important
• "Log only" is the lowest
• "Interrupted" results in no action
AK-LM 330 RS8FR302 © Danfoss 2015-08
Alarm relay
If the controller must give an alarm on a relay output the relay
must be defined:
2 relays can be defined:
• One which is active at alarms with priority "high"
• One which is active at alarms withe priority "low", "middle" and
"high".
The relationship between alarm priority and action appears in the
schedule below.
Log Alarm relay selection
Setting
Non High
High X X
Medium X
Low X
Log only X
Discon-
nected
An alarm disappears when acknowledged or it cease by itself.
Alarm acknowledgement
If the controller is connected to a network with an AKA gateway or
an AK system manager as alarm receiver, these will automatically
acknowledge the alarms that are sent to them.
If the controller on the other hand is not included in a network,
the user must acknowledge all alarms.
Alarm LED
The alarm LED on the front of the controller indicates the
controller's alarm status.
Blinking: There is an active alarm or an unacknowledged alarm.
Fixed light: There is an active alarm that has been acknowledged.
Switched off: There are no active alarms and no unacknowledged
alarms.
IO Status and manual
The function is used in connection with installation, servicing and
fault-finding on the equipment.
With the help of the function, the connected outputs are
controlled.
Measurements
The status of all inlets and outlets can be read and controlled here.
Forced operation
One can carry out an override of all outlets here to control
whether these are correctly attached.
Note: There is no monitoring when the outlets are overridden.
Logging/registration of parameters
As a tool for documentation and fault-finding, the controller
provides the possibility of logging of parameter data in the
internal memory.
Via AK-ST 500 service tool software one can:
a) Select up to 10 parameter values the controller will
continuously register
b) State how often they must be registered
The controller has a limited memory but as a rule of thumb, the 10
parameters can be saved, which are registered every 10 minutes
for 2 days.
Via AK-ST 500 one can subsequently read the historical values in
the form of graph presentations.
Net-
work
Low-middle Low - High
X X
X X X
X X X
AKM-
dest.
1
2
3
71