47
POCO alarm
Pot. free Contact (POCO)
Corresponds to Functions F6, F7, and F8. This function allows a relay contact, in the
Com.G@te (46) to be controlled and activated. Please also review the
Com.G@te
section of the manual.
The following functions are available:
OFF:
The POCO displays the OK status when the unit is ready to operate. This condition
is after the internal controller check, approx. 30 sec. after the switch on. The OK status
will be ended by switching off the mains or a fault.
Check act. value.:
The relay switches when the current internal temperature is outside the range set
between the POCO minimum and maximum internal temperatures (F6 and F7). The
values in functions F6 and F7 are relative to the current set-point. If the range is
exceeded the potential free contact is switched (from the OK status), and the unit will
continue to operate. If the actual value is in the range, the contact will be reset to the
OK status.
External alarm:
The POCO relay is only activated if the unit is in “fault status” when it is switched on.
This is so that the alarm is not raised when the unit gets switched off.
If you wish the alarm function together with the work flow principle, please use the
POCO function
OFF
.
Unipump / PCS: (Unipump / Process Control System)
This POCO function is used to connect the signal calling for the circulation pump to
start with an external booster pump. This has to be done so that the external pump
runs in synchronisation with the circulation pump in the unit, this means that the POCO
activates (to the OK status) as soon as the circulation pump starts.
PCS:
An example of this would be when temperature control would be controlled by a
“PCS" via the external control signal (Menu point External control signal or Function
F28), the POCO can be used to communicate.
Condition POCO
ON
means temperature control is activated.
Condition POCO
OFF
means temperature control is not activated.
Control by RS232:
The relay is controlled via an RS232 command. Therefore please note our Huber-
Software.
Check process temperature.:
A measured temperature check for the PROCESS SENSOR providing it is not the control
sensor. The POCO relay switches when the current external, (process temperature) is
outside the range set between the POCO minimum and maximum external
temperatures.
When the unit is set to internal control, and the POCO check process temperature” is
selected, the temperature of the external sensor is monitored – this sensor can be
independent of the internal temperature and the temperature control process. The limits
set by F6 and F7 still apply.
