XT Controllers for NLV-CN Compressors
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4.16.
Real Time Clock
and Control Timer
The controller contains a real time clock with battery backup. This RTC is used for the control timer, which
can operate different functions. In addition, the RTC is used for the defrosting schedule. For defrosting,
please refer to the section Defrost control function.
Functional description:
The real time clock is powered from the internal NLV supply. In case of a power outage, the RTC will be
powered from the internal battery backup.
The RTC can be setup in one of the following ways:
>
via the local display
>
Tool4Cool
®
>
via the front-end system
If the setup is done via the local display, please follow the instructions in the section Local display
indications and menu.
When T4C is used for setting up the RTC, you do not need to enter a value for each RTC parameter.
Instead, it is possible to push the “Set PC time to NLV” in the T4C menu structure.
Based on the RTC, the NLV controller also has a control timer, with a daily schedule.
With this control timer, it is possible to intervene into the normal control of the NLV.
The parameter “Control timer Function” (t84) has the following options:
0 = None. No override of the NLV.
1 = Do not use.
2 = Main Switch. The NLV is put into stop mode as long as the control timer is active.
3 = Night operation. Selection of daytime/nighttime mode via the internal control timer
.
4 = Light. Light ON/OFF as function of the control timer
.
5 = Application changeover. Selection of an application as a function of a pre-defined schedule in the
control timer
.
6 = Relay out. ON/OFF control of a pre-selected relay, as function of the control timer
.
Parameter Function Code Min. Max.
Default
Setting
Unit
Hour t07 0 23 set hrs.
Minutes t08 0 59 set min.
Day t45 1 31 Set day
Month t46 1 12 Set month
Year t47 9 99 Set years
Control timer start hour t80 0 23 0 hrs.
Control timer start minute t81 0 59 0 min.
Control timer stop hour t82 0 23 0 hrs.
Control timer stop minute t83 0 59 0 min.
Control timer function
0 = None
2 = Main switch
3 = Night operation
4 = Light
5 = Application changeover
6 = Relay out
t84 0 6 0 -
4.17.
Alarm Handler
The alarm handler manages the alarms for the different types of errors.
The alarms can be indicated on the local display and activated by relay or via the Modbus.
All alarms in the controller are split into 5 different groups, depending on type of error:
Group Fault Type Description
0 User application faults
Application faults are faults that are caused by trouble in
the application itself, e.g. the cooling circuit or missing air
to the machinery room
1 System related faults
System faults are related to trouble emerging from ex-
ternal condition to the cabinet. E.g. over voltage on the
mains.
2 Sensor faults
Sensor faults are faults that are detected on the sensors if
they are used.
3 Electronic faults Electronic faults are trouble caused by the electronics.
4 Motor faults
Motor faults are all troubles influencing the motor caus-
ing it to fail to operate. For instance, overload of the cool-
ing system, e.g. too high pressure
4.17.1.
Application
Related Alarms
The application alarms are alarms that relate to the cabinet and are caused by using the cabinet
improperly.
Alarms are stored in the event list and can be read out by Tool4Cool
®
. For some of the alarms the values
related the alarm are stored, too.
Alarm Groups Code Name
Group 0
User application faults
E06 E06 Defrost heat timeout
E05 E05 Defrost hold timeout
E16 E16 Fatal alarm on DI
E04 E04 Door open alarm
E15 E15 General I/O alarm
E76 E76 No valid application selected error
E50 E50 Slave address conflict
E51 E51 DIO2 SWI not enabled
E52 E52 Capacity too high
E53 E53 AIO misconfiguration
E91 E91 General I/O double function failure
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