S+S Regeltechnik THERMASREG FS Notice D'instruction page 7

G
Mounting and Installation
NOTES REGARDING :
– Please ensure that the minimum temperature at the capillary
does not develop at the device's enclosure or at the sensors
(installed inside the enclosure).
– The limit value must actually be exceeded over more than 20 cm
of the length of the capillary. This necessary minimum length of
20 cm may subdivide into several sections.
– The capillary must not be bent or buckled several times.
This could cause leakage and the system's failure to function.
– The voltage output is short-circuit proof.
– Applying overvoltage will destroy the device.
– If this device is operated beyond the specified range,
all warranty claims are forfeited.
DIP SWITCHES
FS
LED INDICATION
FS
FUNCTION:
Inside the capillary of the frost protection monitor, a pressure signal is generated by the filling employed, which is proportional to the lowest temperature
over the entire capillary length (minimum however over 200 mm). A pressure sensor converts this pressure signal into an electric signal, amplified by
electronics. The standard signal 0...10 V equivalent to 0...15 °C thereby generated is output. This voltage is available at the terminal marked "Temp.".
In addition, a switchpoint for the potential-free changeover contact can be preset at a 270-degree adjusting screw, ranging from 0 °C (left stop) to 15 °C
(right stop). When temperature falls below that switchpoint "FS", the relay output switches to position "frost protection" (contact "W" connected to contact
"A"). When temperature rises by more than 2 K above the preset switchpoint "FS" and "automatic" operating mode is selected, the system changes back to
normal operating mode. The relay drops back to initial position (contact "W" connected to contact "B"). When operating mode "manual" is selected and
switchpoint "FS" +2 K is exceeded, the relay output does not automatically switch back, but has to be reset manually by pressing the "Reset" button or by
separating the device from supply voltage.
Additionally, a second voltage output "AV" is available, represented by 0...10 V. At a voltage of 0 V at the control input "ST-E", output voltage "AV" is always
then 0 V, when the measured temperature is at least 6 K above the preset switchpoint "FS". When the temperature measured falls below the preset
switchpoint "FS"+6 K, voltage output "AV" rises linear from 0 V to 10 V. The increase here amounts to 1.67 V per Kelvin of approach to the preset switch-
point "FS". Therefore output voltage 10 V is output when "FS" = temperature measured. When control input "ST-E" is increased, output voltage "AV" is also
increased by that amount. So output "AV" represents a summation output for the input variables "ST-E" and "frost signal". Here, the variable "frost signal"
describes the output behaviour of "AV" at "ST-E" = 0 V. max. 6 output voltage is limited to 10 V.
In case of capillary breakage or electrical damage to the system, the relay output is automatically switched to "frost protection" (contact "W" connected
to contact "A").
Selected examples:
Preset
threshold „FS"
5°C
5°C
5°C
5°C
5°C
* : Calculative, an output voltage of 13 V is generated, which is limited by electronics to 10 V.
SAFETY SWITCHING:
In case of power failure of operating voltage and/or in case of capillary breakage, the relay output witches to position „frost protection"
(contact „A" with contact „W" = currentless condition).
When device inside temperature drops below 10 °C, the heating output is activated (heating element to be ordered separately).
Reset after frost protection
(selectable)
Manual reset
Automatic
LED indication of ACTUAL temperature respectively switching threshold in °C
(Depending on temperature measuring range selected via DIP 2)
Measuring LED
range 1
0 ...+15 °C 0 +1.5
measured
Minimum temp.
12°C
12°C
8°C
8°C
8°C
Mounting
diagram
DIP 1
ON
OFF
LED LED LED LED
2 3 4 5
+3.0 +4.5 +6.0
Output
„Temp."
8 V
8 V
5.33 V
5.33 V
5.33 V
Temperature Range
(selectable)
(not assigned)
0 ...+15 °C
LED LED LED LED
6 7 8
+7.5 +9.0 +10.5 +12.0
Control voltage
„ST-E"
0 V
5 V
0 V
5 V
8 V
FS
DIP 2
ON
OFF
LED LED
9 10 11
+13.5 +15.0
Output voltage
„AV"
0 V
5 V
5 V
10 V
10 V *