Description Of Functions - Bühler technologies ModbusRTU TC-Double Série Notice De Montage

TC-Double (+)
Description of signal outputs
Function/ Description
contact type
Re- internal the following
gar changeover device
d- contact: statuses can
ing max. 250 V be indicated
S2) AC/150 V via two
DC, 2 A, switching
50 VA outputs:
Re- 4-20 mA Signalling of
gar analog out- actual tem-
d- put perature in
ing (R <500 Ω block 1
Load
S3) )
Re- Digital out- Modbus RTU
gar put (RS-485)
d-
ing
S4)
The front film on the display module has three LEDs:
Colour Marking
Red S2
Yellow S1
Green OP
The LEDs OP and S2 indicate the device status similar to S2.
If the option "temperature signal" is built in, the unit has a
signal output via the analogue output to indicate the actual
cooler temperature.
The temperature signal can be read via the panel plug (S3) us-
ing the M12x1 connector. This plug is located next to the mois-
ture detector connectors at the top of the cooler.
The temperature (CH1) which continuously appears in the dis-
play corresponds to the temperature in block 1 (after-cooling).
The analogue temperature signal also corresponds to the
temperature in block 1.
14 Bühler Technologies GmbH
Contact between 3 and 2
closed (alarm)
• No mains voltage and/or
actual temperature out-
side the alarm
thresholds
Contact between 3 and 1
closed (OK)
• Mains voltage attached
+ actual temperature
within the alarm
thresholds
With temperature signal op-
tion
T = -20 °C ≙ (-4 °F) ->
cooler
4 mA/ 2V
T = 5 °C ≙ (41 °F) -> 9 mA/
cooler
4.5 V
T = 60 °C ≙ (140 °F) ->
cooler
20 mA/ 10 V
Interface default values
Baudrate – parity – stop bit:
19200 – Even – 1
Default ID: 10
The bus lines are not intern-
ally terminated.
Function
High/low temperature
Device error
Reserved
Normal operation
5 Operation and control
NOTICE
The device must not be operated beyond its specifications.
After switching on the cooler the block temperature will be
displayed (block 1). The display will flash until the block tem-
perature has reached the preset target value (± adjustable
alarm range). The status contact is in the Alarm position.
Once the target temperature range has been reached, the
temperature will continuously be displayed and the status
contact switches over.
If the display flashes during operation or an error message ap-
pears, please refer to bullet "Troubleshooting".
Please refer to the data sheet for performance data and max-
imum ratings.

5.1 Description of functions

The cooler is controlled by a microprocessor. With the factory
preset the control already incorporates the various character-
istics of the built-in heat exchangers.
The programmable display shows the block temperature in
the selected display unit (°C / °F) (factory preset °C). Applica-
tion-specific settings can easily be configured guided by the
menu, using the 5 buttons. For one, this applies to the target
outlet dew point, which can be set from 2 to 20 °C (36 °F to
68 °F) (factory preset 5 °C/41 °F).
And then the warning thresholds can be adjusted for low and
excess temperature. These are set relative to the outlet dew
point τ setting.
a
For the low temperature the range is τ
imum 1 °C/ 34 °F cooling block temperature), for the excess
temperature the range is τ
a
both values are 3 K.
The flashing display and the status relays indicate the condi-
tions are below or above the configured warning range (e.g.
after switching on).
The status output can e.g. be used to control the sample gas
pump to allow for the gas flow to only be switched on once
the permissible cooling range has been reached or shut off the
pump in the event of a moisture detector alarm.
The separated condensate can be drained via connected peri-
staltic pumps or add-on automatic condensate drains.
Fine mesh filters can also be used, which in turn can be in-
stalled in optional moisture detectors.
The glass dome allows the dirt level of the filter element to
easily be determined.
The moisture detector is easy to remove. This may be required
if a condensate enters the cooler due to a malfunction and the
peristaltic pump or the automatic condensate drain is unable
to remove it.
The TC-Double has an additional cooling stage for pre-cooling
the gas (heat exchanger 2), the block temperature of which
varies by ambient temperature and load. The target value of
the pre-cooling stage corresponds to that of block 1.
-1 to - 3 K (at a min-
a
+1 to +7 K. The factory presets for
BX440021 ◦ 09/2021