ECKELMANN VS 3015 CT, Инструкция по эксплуатации, Страница: 37 / 219

Firmware V1.41 V1 08.11.2022 37/219
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Behaviour in the event of a fault
CAN bus fault of individual nodes
If no telegram is received from a specific case controller for a time period greater than the timeout for load
level reception, the associated case controller is not considered for the to-shift until the receipt again of the
corresponding telegram.
Global CAN bus fault
The current t
0
setpoint remains unchanged. After expiry of an alarm delay time of 10 minutes, the No load
level error message is registered that will not be reset until receipt of new load level information via the CAN
bus.
5.4.4.3 Setpoint Shift via CAN Bus
If the t
0
shift via CAN bus has been selected (menu 3-2-1-2), the t
0
setpoint shift is performed via the CAN bus.
This can be implemented using a higher level E*LDS controller (e.g. WRG 3010 A).
5.4.4.4 Setpoint Shift via External Analogue Signal
If the t
0
shift via external signal has been selected ( menu 3-2-1-2) , the t
0
setpoint shift is performed via an
external 0..10 volts signal. The 0..10 volts analogue input at the terminals 51/52 is used for the to shift.
If the external t
0
shift is active, a minimum input voltage – for detection of any measuring circuit fault – can be
specified using an offset. If the input signal falls below the specified offset value minus 2% for longer than 30
seconds then the error message "
Messk.ext.to-Sch. " is output. If the offset is set to zero, no message is output.
The default value for the signal is Prio. 2. If the t
0
shift via an external 0..10 volts signal is active, the t
0
setpoint
is calculated using the following function:
to
Soll
: t
0
setpoint shifted via external signal
to
max
: Maximum permissible t
0
(from already available t
0
characteristic)
to
min
: Minimum permissible t
0
(from already available t
0
characteristic)
U
ext
: External 0..10 V voltage signal
U
min
: Offset for the monitoring of a cable break
Display of the associated setpoints:
If the HRC setpoint shift is active, the t
0
setpoint shift cannot be activated and therefore the entry Ext. Signal is
not displayed in the selection list.
If the to shift via
Ext. Signal is active, the HRC setpoint shift cannot be activated and therefore the parameter
" Setp.shift ." is not displayed in the HRC Setpoints menu.
The parameters Max.LoadLevel, Min.LoadLevel, Increment and Interval are hidden in the to Shift menu if the t
0
shift is performed using the room temperature, CAN bus or an external signal.
The parameter
Off.Ext.Sig. is only displayed if the t
0
shift is performed via the external signal.
As this input is also used for the HP setpoint shift in HRC mode, a to-shift via the external signal is only
possible when the HP setpoint shift is inactive. Conversely, an HP setpoint shift can only be activated
when the to-shift is not performed via an external signal.

In order to prevent large fluctuations of the t
0
setpoint, the change of the setpoint is delayed relative to
the external signal.
