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32 Channel Relay Controller Board User Guide

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1 32 Channel Relay Controller Board – User Guide

IntroductionNumato Lab's 32 Channel Relay Controller Board is a smart choice for controlling higher current loadsfrom your micro controller development board or a PC parallel port. This board has thirty two on-board relays which can switch up to 10A. All relay terminals (C, NC, NO) are accessible through screwterminals which makes wiring up the board very easy. The relays are driven by popular darlingtonarray ULN2803. Relay coil is rated for 12VDC.

Some of the possible uses of this module include • Home Automation• Lighting Control• Garden Equipment Control• Industrial Automation• Test Fixtures• DIY and Hobby

This module has thirty two on board relays and associated drivers capable of controlling a largenumber of devices including lamps, motors, locks etc...

Features• Very compact and easy to wire up.

• Connects directly to TTL devices (Microcontrollers, Arduino etc..).

• Thirty two Relays with three pin screw terminals for easy connectivity.

©2015 NUMATO SYSTEMS PVT LTDwww.numato.com


How to use the moduleThe following section describes how to use this module.

Components/Tools required

Along with the module, you may need the items in the list below for easy and fast installation.

1. 12V 2A DC supply.

2. Medium size Philips screw driver.

Connection Details

IMPORTANT Please exercise utmost caution while working with electrical mains or otherhigh voltages. Failure to comply with safety regulations may result in injury and or death.

Connection Diagram

Above image shows basic connection diagram that can be used in most of the situations. Theconnection diagram is same for both AC and DC loads. Please make sure to use a freewheeling diodeor snubber circuit if the load is inductive. More details about using inductive loads is availableelsewhere in this document. It is important to make sure that the wires used to connect loads aresufficiently rated to handle expected load current. Exercise caution while working with high voltages.The following sections identify individual connections in detail.



Relay Contacts

All contacts on each relay is available externally on screw terminals for easy user access. The relays arerated for AC and DC supply voltages. Please see the electrical parameter table for more details. Each

relay has three contacts(C, NO and NC). C is the common terminal and isused in both normally open and normally closed positions. The contacts NCand C will be connected when the relay is turned off and will bedisconnected when relay is turned on. And vice versa, the contacts C andNO will be disconnected when relay is turned off and will be connectedwhen the relay is turned on. Table below summarizes possible relay contactpositions.

Relay State Connection between NC and C Connection between NO and C

OFF Close Open

ON Open Close

DC Power SupplyThis module uses +12V supply for the relay coils. The +12V supply for the relay coils is not optionaland the relay will not switch without this supply. Any off the shelf 12V DC power supply can be usedfor this purpose. Make sure to connect the power supply in correct polarity. Connect the positiveterminal of the power supply to the +12 terminal on the module. Connect negative terminal of thepower supply to GND terminal of the module. Connecting power supply incorrectly can cause damageto the module and/or other devices.



Triggering RelayThe relays on the board can be either turned on by using micro controller or DC supply with a Series resistor 2.2K ohm. The triggering pins are marked as RL0 to RL31 respectively.

Trigger In Relay

RL0 Relay 0

RL1 Relay 1

RL2 Relay 2

RL3 Relay 3

RL4 Relay 4

RL5 Relay 5

RL6 Relay 6

RL7 Relay 7

RL8 Relay 8

RL9 Relay9

RL10 Relay 10

RL11 Relay 11

RL12 Relay 12

RL13 Relay 13

RL14 Relay 14

RL15 Relay 15

RL16 Relay 16

RL17 Relay 17

RL18 Relay 18

RL19 Relay 19

RL20 Relay 20

RL21 Relay 21

RL22 Relay 22

RL23 Relay 23

RL24 Relay 24



RL25 Relay 25

RL26 Relay 26

RL27 Relay 27

RL28 Relay 28

RL29 Relay 29

RL30 Relay 30

RL31 Relay 31



Additional InformationUsing relay modules with inductive loadsIt is important to take additional care when using relays with inductive loads. An inductive load ispretty much anything that has a coil and works based on magnetic principles like Motors, Solenoidsand transformers. Inductive loads produce back emf when the magnitude of the load current changes.The back emf can be in the order of tens or even hundreds of voltage (See this Wikipedia articlehttp://en.wikipedia.org/wiki/Counter-electromotive_force). This effect is most severe when power isdisconnected from inductive load because the rate of change of current is maximum at that point.Even though the back emf lives only for a very short time (a few milliseconds) it can cause sparksbetween the relay contacts and can deteriorate the contact quality over time and reduce the life spanfor the relays considerably.

So it is important to take countermeasures to suppress the back emf to acceptable levels to protectrelay contacts. Usually this requires connecting electronic devices in parallel with the load such thatthey absorb the high voltage components generated by the load. For solenoids, connecting a diode(fast switching diode is recommended) in parallel tothe load (in reverse direction to the load current) isvery effective. A diode used for this purpose is usuallycalled a freewheeling diode. Please see the diagramon the right for connection details.

A capacitor with proper rating is recommended for protecting the relay contacts when a motor is usedas load. The capacitor should be rated enough to withstand the back emf that is generated by themotor. Please see the diagram below for connection details.


http://en.wikipedia.org/wiki/Counter-electromotive_force


Please note that the relay modules are NOT shipped with back emf suppression devices pre-installed.The exact kind of suppression device and the parameters of the selected device can vary dependingon the load itself. Some of the parameters that affects the suppression device selection are theinductance of the load, power supply voltage, load current, physical size/structure of the load etc.. Itis obvious that it is impossible for us to predict these parameters and design required back emfsuppression device and incorporate that on the board. So we believe this is a task best left to themodule user. There is an excellent article on designing back emf suppression on Wikipedia athttp://en.wikipedia.org/wiki/Flyback_diode


http://en.wikipedia.org/wiki/Flyback_diode


Technical Specifications

Parameter * Value Unit

Basic Specifications

Number of relays 32

Relay Specifications

Nominal relay coil voltage 12 V

Nominal coil power consumption (per relay) 360 mW

Relay contact material Silver Alloy

Contact rating 1A: 10A 240VAC/ 12A 120VAC 1C: 7A 240VAC/ 10A 120VAC

Maximum switching voltage 250VAC/ 30VDC

Maximum switching current 15 A

Maximum switching power 2770VA/ 240W

Contact resistance (initial) 100 Min at 6VDC 1A mΩ

Life expectancy (Electrical) 100,000 Operations

Life expectancy (Mechanical) 10,000,000 Operations

Nominal insulation resistance 100 Min at 500VDC MΩ

Maximum switching on response time 10 mS

Maximum switching off response time 5 mS* All parameters considered nominal. Numato Systems Pvt Ltd. reserve the right to modify products without notice.* http://kyotarelays.com/datasheets/KT%20603.pdf


http://kyotarelays.com/datasheets/KT%20603.pdf


FAQQ. I need a customized version of this product, can Numato do the customization for me?A. Yes, we can definitely do customization but there may be minimum order requirements depending on the level ofcustomization required. Please write to [email protected] for a quote.

Q. Where can I buy this product?A. All Numato products can be ordered directly from our web store http://www.numato.com. We accept major creditcards and Paypal and ship to almost all countries with a few exceptions. We do have distributors in many countries whereyou can place your order. Please find the current list of distributors at http://numato.com/distrib.


http://numato.com/distrib

http://www.numato.com/

mailto:[email protected]


Physical Dimensions

SchematicsSee next page.


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Date: 14 nov 2014KiCad E.D.A.

Rev: 1.0Size: A3Id: 1/1

Title: 32ChannelRelayControllerBoard

File: 32ChannelRelayControllerBoard.schSheet: /

Numato Labhttp://www.numato.comLicense : CC BY-SA

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+

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12V

L16

L16

L16L15

L15

L15

L14

L14

L14

L13

L13

L13

L12

L12

L12

L11

L11

L11

L10

L10

L10

L9

L9

L9

L8

L8

L8

L7

L7

L7

L6

L6

L6

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L5L5

L4

L4

L4

L3

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L3

L2

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L2

L1

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I22

I33

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I66

I77

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GND9 COM 10O8 11O7 12O6 13O5 14O4 15O3 16O2 17O1 18

U20

ULN2803

C13

0.1µF

PWR_FLAGVRELAY

GND

C14

0.1µF

C150.1µF

C16

100µF

VRELAY

GND

VRELAY

1

2

P4

12

D17

LED

12

D16

LED

12

D15

LED

12

D14

LED

12

D13

LED

12

D12

LED

12

D11

LED

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LED

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LED

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D7

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LED

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LED

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34

56

78

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2K2

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34

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78

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1 2 3

K16

1 2 3

K14

1 2 3

K12

1 2 3

K10

1 2 3

K8

1 2 3

K7

1 2 3

K5

1 2 3

K2

1 2 3

K17

1 2 3

K15

1 2 3

K13

1 2 3

K11

1 2 3

K9

1 2 3

K6

1 2 3

K4

1 2 3

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12

34

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RL9

12

34

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RL11

12

34

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RL13

12

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RL14

12

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RL10

12

34

5

RL12

12

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RL1

12

34

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RL3

12

34

5

RL5

12

34

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RL7

12

34

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RL16

12

34

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RL15

12

34

5

RL2

12

34

5

RL4

12

34

5

RL6

12

34

5

RL8

12

D2

LED

VRELAY

C45

0.1µF

R61

10R

R60

10R

C44

0.1µF

R59

10R

C43

0.1µF

R58

10R

C42

0.1µF

R57

10R

C41

0.1µF

R64

10RC40

0.1µF

R63

10R

C39

0.1µF

R62

10RC46

0.1µF

R65

10R

C47

0.1µF

R66

10R

C48

0.1µF

R67

10R

C49

0.1µF

R68

10RC50

0.1µF

R69

10R

C51

0.1µF

R70

10R

C54

0.1µF

R71

10RC52

0.1µF

R72

10R

C53

0.1µF

L016

L015

L014

L013

L012

L011

L010

L09

L08

L07

L06

L05

L04

L03

L02

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1 2 3

K21

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K22

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K18

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K24

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K25

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K19

1 2 3

K20

1 2 3

K28

1 2 3

K27

1 2 3

K26

1 2 3

K33

1 2 3

K32

1 2 3

K31

1 2 3

K30

1 2 3

K29

12

34

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RL20

12

34

5

RL19

12

34

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RL18

12

34

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RL17

12

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RL30

12

34

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RL31

12

34

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RL24

12

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RL23

12

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RL22

12

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RL21

12

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RL25

12

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RL32

12

34

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RL26

12

34

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RL27

12

34

5

RL28

12

34

5

RL29

C29

0.1µF

R41

10R

R40

10R

C28

0.1µF

R39

10R

C27

0.1µF

R38

10R

C26

0.1µF

R37

10R

C25

0.1µF

R44

10RC24

0.1µF

R43

10R

C23

0.1µF

R42

10RC30

0.1µF

R47

10R

C31

0.1µF

R48

10R

C32

0.1µF

R49

10R

C33

0.1µF

R50

10RC34

0.1µF

R51

10R

C35

0.1µF

R52

10R

C38

0.1µF

R53

10RC36

0.1µF

R54

10R

C37

0.1µF

VR

EL

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12

D34

LED

12

D33

LED

12

D32

LED

12

D31

LED

12

D30

LED

12

D29

LED

12

D28

LED

1 2

3 4

5 6

7 8

R55

2K2

1 2

3 4

5 6

7 8

R56

2K2

12

D27

LED

VRELAY

I11

I22

I33

I44

I55

I66

I77

I88

GND9 COM 10O8 11O7 12O6 13O5 14O4 15O3 16O2 17O1 18

U31

ULN2803

I11

I22

I33

I44

I55

I66

I77

I88

GND9 COM 10O8 11O7 12O6 13O5 14O4 15O3 16O2 17O1 18

U30

ULN2803

C22

0.1µF

C21

0.1µF

VRELAY

VR

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12

D26

LED

12

D25

LED

12

D24

LED

12

D23

LED

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D22

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D21

LED

12

D20

LED

1 2

3 4

5 6

7 8

R45

2K2

1 2

3 4

5 6

7 8

R46

2K2

12

D19

LED

C55

100µF

C56

100µF

L01L02L03L04L05L06L07L08

L09L010L011

L013L012

L014L015L016

L01

L02

L03

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L011

L012

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C58

100µF NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NONC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

NC C NO

RELAY 0

RELAY 1

RELAY 2

RELAY 3

RELAY 4

RELAY 5

RELAY 6

RELAY 7

RELAY 8

RELAY 9

RELAY 10

RELAY 11

RELAY 12

RELAY 13

RELAY 14

RELAY 15

RELAY 16

RELAY 17

RELAY 18

RELAY 19

RELAY 20

RELAY 21

RELAY 22

RELAY 23

RELAY 24

RELAY 25

RELAY 26

RELAY 27RELAY 27

RELAY 28

RELAY 29

RELAY 30

RELAY 31

1 2

3 4

5 6

7 8

R6

2K2

1 2

3 4

5 6

7 8

R7

2K2

1 2

3 4

5 6

7 8

R8

2K2

123

K39

123

K40

123

K41

123

K42

123

K43

123

K44

1 2

3 4

5 6

7 8

R1

2K2

1 2

3 4

5 6

7 8

R2

2K2

1 2

3 4

5 6

7 8

R3

2K2

1 2

3 4

5 6

7 8

R4

2K2

123

K1

123

K34

123

K35

123

K36

123

K37

123

K38

I11

I22

I33

I44

I55

I66

I77

I88

GND9 COM 10O8 11O7 12O6 13O5 14O4 15O3 16O2 17O1 18

U21

ULN2803

VR

EL

AY

1 2

3 4

5 6

7 8

R5

2K2

C1

100µF

C2100µF

GND

RL0

RL1

RL2

RL3

RL4

RL5

RL6

RL7

RL8

RL9

RL10

RL11

RL12

RL13

RL14

RL15

GND

GND

RL16

RL17

RL18

RL19

RL20

RL21

RL22

RL23

RL24

RL25

RL26

RL27

RL28

RL29

RL30

RL31

GND

P1

R910K VRELAY

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