Bühler technologies RC 1.2 Rack Kurzanleitung Seite 16

RC 1.2 Rack, RC 1.2+ Rack
Function / Description
contact type
Internal The following
changeover device states
contact: max. can be indic-
30 V AC / 60 ated via the
V DC, 1 A switching out-
put:
4.4.3 Status output cooler (B)
The maximum switching capacity of the status output is
30 V AC / 60 V DC, 1 A.
The status output (S2, B) indicates when the cooler block tem-
perature is outside the specified limits. No distinction is made
as to whether the alarm was triggered by excess temperature
or insufficient temperature.
Function / Description
contact type
Internal The following
changeover device states
contact: max. can be indic-
30 V AC / 60 ated via the
V DC, 1 A switching out-
put:
4.4.4 Analogue output (C)
If the analogue output option is integrated, the actual cooling
block temperature is output via the 12-pin terminal block (S2,
C) as a 4...20 mA signal.
The device menu offers the option to reconfigure the interface
from current output to voltage output. The analogue value is
then represented as a 2...10 V signal.
Function / Description
contact type
4-20 mA ana- Signalling of the
log output cooling block
(R <500 Ω) temperature
load
(please use
shielded cables)
16 Bühler Technologies GmbH
Contact between 2 and 3 closed
(alarm)
• Humidity sensor detects
residual moisture in the
sample gas or cable break:
Error message.
Contact between 1 and 2 closed
(OK)
• No residual moisture in
the sample gas / no cable
break.
Contact between 5 and 6 closed
(alarm)
• No mains voltage and/or
actual temperature value
outside the set alarm
thresholds.
• Device in fault condition /
pump deactivated.
Contact between 4 and 5 closed
(ok)
• Mains voltage applied +
actual temperature value
within the set alarm
thresholds.
T = -20 °C ≙ (-4 °F) -> 4 mA/
cooler
2 V
T = 5 °C ≙ (41 °F) -> 9 mA/
cooler
4.5 V
T = 60 °C ≙ (140 °F) ->
cooler
20 mA/10 V
4.4.5 Digital output (E)
The digital output option is available via the 12-pin terminal
block (S2, E). Pin 10: Signal A, Pin 11: Signal B.
Via this interface, various measurement values and device
statuses can be read and the cooler can be parameterised. A
detailed description of the interface can be found in the
chapter Using the Digital Interface.
Function / Description
contact type
Digital out- Modbus RTU
put (RS-485)
5 Operation and control
NOTICE
The device must not be started or operated outside the spe-
cifications!
Before commissioning, the device should be left to stand
quietly and upright for at least 1 hour after transport, posi-
tioning, or installation.
After switching on the cooler, the display shows the cooling
block temperature. The display flashes until the cooling block
temperature has reached the setpoint value (± adjustable
alarm range). The status contact is in the alarm position.
When the set temperature range is reached, the cooling block
temperature is displayed continuously and the status contact
switches over.
If the display flashes or an error message appears during op-
eration, please refer to the section 'Troubleshooting and Cor-
rection'.
The performance data and limits can be found in the technical
data in the appendix.
5.1 Description of functions
The cooler is controlled by a microprocessor. The factory set-
tings of the controller already take into account the different
characteristics of the installed heat exchangers.
The programmable display shows the cooling block temperat-
ure according to the selected unit of display (°C/°F) (factory
setting: °C). Application-specific settings can easily be made in
the menu using the five keys. This not only applies to the tar-
get outlet dew point, which can be set from 3 °C to 20 °C (37 °F
to 68 °F) (factory setting 5 °C/41 °F),
but also the warning thresholds for high/low temperature.
These are set relative to the configured outlet dew point τ
For the low temperature, a range from τ
least 1 °C/34 °F coolant block temperature) is available; for the
high temperature, a range from τ
tings for both values are 3 K.
Falling below or exceeding the configured warning range (e.g.
after switching on) is indicated both by the LED S2 blinking on
the display and by the status relay.
Interface default values
Baudrate – Parity – Stop bit:
19200 – Even – 1
Default ID: 10
The bus lines are not internally
terminated.
-1 K to -3 K (but at
a
+1 K to +7 K. The factory set-
a
BX450040 ◦ 07/2025
.
a