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general:keramik:keramikugnsstyrning

Contactor/relay in kiln

Visible on front: 3RT1024-1A..0
Visible on side: EAN 4 011209 291027
Probably this one:
Siemens 3RT1024-1AP00
http://www.conrad.com/ce/en/product/502380/Siemens-SIRIUS-3R-contactor-3RT1-Siemens-3RT1024-1AP00-S0-230-Vac
https://www.elfa.se/elfa3~se_sv/elfa/init.do?item=36-228-29&toc=0&q=3rt1024-1a
https://www1.elfa.se/data1/wwwroot/assets/datasheets/3RT_1015-1034_eng_tds.pdf
http://cache.automation.siemens.com/dnl/Tg/Tg0NzM0MQAA_6009084_HB/03_1sirius_en.pdf

Size S0
Rated control supply voltage Us at 50Hz: 230

How much current is needed for A1/A2? 61/230 = 0.265A = 265mA
Looks like 61VA max and 7.8VA when closed according to:
http://docs-europe.electrocomponents.com/webdocs/058e/0900766b8058e7af.pdf

Thermocoule Type S sensor

Sensor reader

Relay with RPi

Maybe diode is not fast enough - it is so no worries

Since the rise rate of the current (di/dt) of most systems is very fast (usually fractions of microseconds) “fast”, “ultrafast”, or Schottky diodes are used. Regular power diodes, such as the commonly used “1N4007” series, are not suitable as snubbers as their reverse recovery time (turn on time) is several tens of microseconds; the diodes do not turn on fast enough to suppress the fast voltage spike.

Contact and cable

AMP 182694-1
Cable outer diameter 7.5mm
Cable 10 wires 2 separate shielded for thermocouple sensor
Contact inner diameter of dragavlastning 19mm
Contact (contact side) outer diameter 21.5mm
Lead size, outer diameter 1.5mm core diameter 0.5-0.6mm = 0.20-0.28mm2

Possible watchdog timer

Also watchdog in the RPi

Test with G5NB-1A-E-5VDC relay

Elfa 37-071-60 5VDC 200mW - G5NB-1A-E-5VDC
Elfa 71-014-58 Transistor TO-92 NPN 45V - BC337-25
Elfa 10-526-25 Likriktardiod DO-41 400V 1A - 1N4004

http://www.petervis.com/Raspberry_PI/Driving_Relays_with_CMOS_and_TTL_Outputs/Driving_Relays_with_CMOS_and_TTL_Outputs.html

Relay: 5 / 125 = 40mA needed
BC337-25 100mA - hFE 250
40mA / 250 = 0.16mA needed for Ib base current
3.3 / 0.16mA = 20625 Ohm

Test with G4A-1A-E 5VDC relay

Relay: 5V / 27.8ohm = 180mA needed
2N4401 150mA - hFE 100
180mA / 100 = 1.8mA needed for Ib base current
3.6 / 1.8mA = 2k Ohm (2.kOhm turns out to give ~140mA through the spool)
http://se.rs-online.com/web/p/non-latching-relays/6839065/

RS Online order - 2014-07-31

Artikelnummer Antal Enhetspris Varornas värde Produkt
783-3894 1 70,12 kr 70,12 kr Thermocouple-to-Digital, type S SOIC8
129-1320 1 29,48 kr 29,48 kr TE Connectivity 182649-1, 14 Pole Male Straight Cable Mount Circular Connector, Shell Size 17,Male Contacts
452-6657 10 9,795 kr 97,95 kr PIN 1.5-2.5MM GOLD
411-438 1 28,98 kr 28,98 kr CPC cable clamp,Shell size 17A
683-9065 2 34,30 kr 68,60 kr SPST-NO PCB Mount Non-Latching Relay, 5V dc

Logic Threshold Voltage Levels

More from ELFA

Linear PSU

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GBU405 rectifier
4700uF 16V
100uF 16V
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L4940V5 LDO voltage regulator
Here are some tests - LinearPSUTests

Using LT1764A instead

Calculating Resitor values

Vout = 1.21(1+R2/R1) + Iadj * R2
Iadj = 3uA

R1=3.9k

Vout = 1.21 + 1.21 * R2/R1 + 3e-6 * R2
Vout - 1.21 = 1.21 * R2/R1 + 3e-6 * R2
R1(Vout - 1.21)/1.21 = R2 + 3e-6 * R2
R1(Vout - 1.21)/1.21 = (1 + 3E-6) * R2
(R1(Vout - 1.21)/1.21)/(1 + 3E-6) = R2
R1(Vout - 1.21)/(1.21 + 3.63E-6) = R2

Vout = 4.5 - 1.21, R1 = 3.9k
3.29 * R1/(1.21 + 3.63E-6) = R2 = 10.6k

Vout = 5.5 - 1.21, R1 = 3.9k
4.29 * R1/(1.21 + 3.63E-6) = R2 = 13.8k

How to get 10.6k - 13.8k with 26k trimpot?

Assume trimpot goes between 2.6k - 26k (not from zero)

13.8k-10.6k = 3.2k
8.2k - 5% = 7.8k
13.8k - 7.8k = 6k

1/6k-1/26k = 1/X
X = 7.8k

Use 8.2k E12 value (will get 6.2k trimpot)

So R1 = 3.9k, R2 = 8.2k + 26k || 8.2k

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general/keramik/keramikugnsstyrning.txt · Last modified: 2020/11/17 20:00 by