Detcon Four Channel Relay Card User Manual

Four Channel Relay Card

Operator’s Instruction Manual

DETCON, Inc.

4055 Technology Forest Blvd. Suite 100,

The Woodlands, Texas 77381

Ph.281.367.4100 / Fax [phone]

www.detcon.com

March 19, 2014 • Document #5155 • Revision 1.2

This page left intentionally blank

4 Channel Relay Card

Four Channel Relay Card Instruction Manual ii

4 Channel Relay Card

Table ofC ontents

1.0 Introduction.............................................................................................................................................. 1

1.1 Description........................................................................................................................................... 1

1.2 I/O Connections.................................................................................................................................... 1

1.2.1 Power Input.................................................................................................................................. 1

1.2.2 Sensor Inputs................................................................................................................................ 1

1.2.3 Relay Outputs............................................................................................................................... 1

1.2.4 Reset Switch Input........................................................................................................................ 2

2.0 Installation................................................................................................................................................ 2

3.0 Relay Card Configuration....................................................................................................................... 3

3.1 Sensor/Channel Configuration ............................................................................................................. 3

3.2 Alarm Configurations........................................................................................................................... 4

3.2.1 Silencable or Non Silenceable...................................................................................................... 5

3.2.2 Latching or non-Latching Relays................................................................................................. 5

3.2.3 Energized or Non-Energized........................................................................................................ 5

3.2.4 Fault............................................................................................................................................. 5

3.3 Reset..................................................................................................................................................... 5

4.0 Troubleshooting Guide............................................................................................................................ 6

5.0 Specifications............................................................................................................................................ 6

5.1 Parts List............................................................................................................................................... 6

6.0 Warranty.................................................................................................................................................. 7

7.0 Revision Log............................................................................................................................................. 8

Table ofFigu res

Figure 1 Relay Card Layout..............................................................................................................................2

Figure 2 Sensor/Channel configuration DIP Switches...................................................................................... 3

Figure 3 Alarm Configuration DIP Switches....................................................................................................4

Four Channel Relay Card Instruction Manual iii

4 Channel Relay Card

This page left intentionally blank

Shipping Address 4055 Technology Forest Blvd. Suite 100,., The Woodlands Texas77381

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

Four Channel Relay Card Instruction Manual iv

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067

4 Channel Relay Card

1.0 Introduction

1.1 Description

The Detcon Four Channel Relay Card provides a low cost means of adding gas detection alarms to a fire alarm
panel. The Relay Card is designed to interface up to four analog 4-20mA gas detection sensors and supports
three programmable alarm levels for each channel. Any 4-20mA gas sensor can be used with this card.

The sensor inputs are continuously monitored by an A/D converter and microcontroller. Whenever one or
more of the sensor inputs exceeds a preset configurable alarm level, the appropriate alarm relay is activated.
The relays and alarm levels are configured using DIP switches mounted on the Relay Card. The Relay Card
provides three configurable alarms (Alarm 1, Alarm 2, and Alarm 3) and a Fault alarm.

Each alarm provides a set of dry relay contacts. These relay contacts consist of “Normally Open” (NO),
‘Normally Closed’ (NC), and ‘Common’ (C).

The four relay outputs are associated with:

 Three alarm levels

o Alarm Level 1
o Alarm Level 2
o Alarm Level 3

 Sensor fault

An enclosure is not included with The Four Channel Relay Card. The Relay Card must be

NOTE

mounted in a user-supplied enclosure appropriate for the environment in which it will be
used. Typically, the card is mounted inside a fire alarm controller enclosure.

1.2 I/O Connections

1.2.1 Power Input

The Relay Card operates using a supply voltage from 12 to 28VDC. Power connections are made via a 2 pin
connector in the lower left corner of the Relay Card (Figure 1). This is a 2 pin connector (Detcon p/n 306­175701-900).

1.2.2 Sensor Inputs

The Relay Card uses 3-pin connectors (Detcon p/n 306-177984-800) for the sensor connections. The pin out
for these connectors is: GND, sensor power (12-28VDC) and 4-20mA input (Figure 1). The sensor power pin
is connected directly to the supply power connector. The sensor power pin is intended to power a single
sensor (up to 100mA). Any voltage applied to the supply power pin will be present at the sensor power pin on
the sensor connector. If 3-wire sensors are being used, all three pins in the sensor connector are used; if a two­wire sensor is being used, only power and mA connections are used.

1.2.3 Relay Outputs

Each relay also uses a 3-pin connector (Detcon p/n 306-175701-900) to provide dry relay contacts. The pin
out is for the relay connectors are: Normally Open (NO), Common (C), and Normally Closed (NC) (Figure 1).
The relays are rated at 5A 30VDC or 250VAC.

Four Channel Relay Card Instruction Manual Rev. 1.2 Page 1 of 8

4 Channel Relay Card

1.2.4 Reset Switch Input

The reset/silence switch uses a 2-pin connector (Detcon p/n 306-175701-900). The reset connector allows for
the use of an external, normally-open, momentary push-button switch to reset and/or silence alarms (Figure 1).
When the switch is closed, it will reset any latched alarms or silence any Silenceable alarms.

NO C NC

Alarm x

Alarm Relay

Dry Contacts

ON OFF

Silencable

Latching

Energized

ALARM 1

Latching

Not Used

FAULT

+ -

Power IN

12-28VDC

ON OFF

ALARM 2

ON OFF

ALARM 3

External

Reset

Silencable
Latching
Energized

Silencable
Latching
Energized

Power Input
and Reset

Alarm
Relay
Settings

GND

PWR

mA

ON OFF

60%
55%
50%
45%
40%
35%
30%
25%
20%
15%
10%

CHx

Enable

CHx

Channel Input

and Alarm Levels

Figure 1 Relay Card Layout

2.0 Installation

1. Mount the Relay Card on standoffs so that there is no probability of shorting out any components on
the back side of the Relay Card. The standoffs should be at least 3/8” tall. The screw size is set for 6-

32.

An enclosure is not included with The Four Channel Relay Card. The Relay Card must be

NOTE:

mounted in a user-supplied enclosure appropriate for the environment in which it will be
used. Typically, the card is mounted inside a fire alarm controller enclosure.

Four Channel Relay Card Instruction Manual Rev.1.2 Page 2 of 8

4 Channel Relay Card

2. Connect the sensors to the Relay Card via the three pin connectors labeled CH1, CH2, CH3, and CH4.
The connectors provide Power, Power Return, and mA connections for the sensors and are labeled as
‘GND’, ‘PWR’, and ‘mA’. Refer to Figure 1.

3. Connect incoming power to the two pin power connector. (located on the lower left corner of the
RELAY CARD.) The input voltage has to be 12 to 28VDC for the Relay Card and the sensors to
operate correctly. Refer to Figure 1 for proper connections.

4. Each alarm relay is provided with a 3-pin connector for connection to an exterior controller, or alarm.
These connectors are labeled ‘Alarm 1’, ‘Alarm 2’, ‘Alarm 3’, and ‘Fault’. The contacts are Common,
Normally Open, and Normally Closed, labeled ‘C’, ‘NO’, and ‘NC’ respectively (Figure 1).

5. If an external ‘Reset Switch’ is to be wired to the control Relay Card, the switch is to be a normally
open momentary closed switch wired to the External Reset Connector (Figure 1).

3.0 Relay Card Configuration

3.1 Sensor/Channel Configuration

Each Sensor/channel has a DIP switch bank with 12 switches. Switch 1 is used to enable or disable the
channel. Switches 2-12 are used to set the alarm levels for the channel. These eleven switches represent levels
from 10% - 60% of full range in 5% increments. A maximum of three switches per channel can be activated
(excluding the enable/disable switch) to configure the three alarm levels for a specific channel. Refer to the
Table 1 for examples of alarm configurations.

ON OFF

60%
55%
50%
45%
40%
35%

GND
PWR
mA

CHx

Sensor

Connections

30%
25%
20%
15%
10%
Enable

CHx

Alarm

Level Switch

Figure 2 Sensor/Channel configuration DIP Switches

If the mA input from the sensor rises above the configured level of the switch setting for that particular sensor
the corresponding alarm relay is activated. I.E.: If the sensor connected to ‘CH1’ has the DIP switches set for
20%, 40% and 60%, and the sensor mA rises above 20% full scale, alarm 1 will be activated. If the mA input
rises above 40% full scale, alarm 2 will activate, and if the mA rises above 60% full scale, alarm 3 will
activate.

When an alarm level switch is set to “ON”, the alarm level corresponding to that switch is
active for that particular channel. When only one level is active the switch is associated

NOTE:

with Alarm 1 (A1). If two switches are active, the lowest is A1 and the highest is A2.
When three switches are active, the lowest level is Alarm 1, the middle level is Alarm 2 and
the highest level is Alarm 3 (A1, A2, A3).

Four Channel Relay Card Instruction Manual Rev. 1.2 Page 3 of 8

Table 1 Examples of Alarm Configuration

S W 12

S W 11

S W 10

S W 9

S W 8

S W 7

S W 6

S W 5

S W 4

S W 3

S W 2

S W 1

4 Channel Relay Card

60%
55%

50%
45%

40%
35%

30%
25%

20%
15%

10%
EN

M eaning

OFF OFF X OFF OFF OFF OFF
OFF OFF X OFF OFF OFF OFF

ON

OFF OFF X OFF OFF OFF OFF
OFF OFF X OFF OFF OFF OFF
OFF
OFF OFF X OFF OFF OFF OFF
OFF
OFF OFF X

ON ON
ON

ON ON

Enabled,
ALM1=10%,
ALM2=15%,

ALM3=50%

OFF X

ON

ON

OFF X OFF OFF OFF

Enabled,
ALM1=15%,
ALM2=25%,

ALM3=35%

X OFF

X OFF OFF OFF

X OFF OFF OFF

OFF

Disabled,

input

ignored

ON

ON

ON ON O N ON

Enabled,
ALM1=20%,
ALM2=50%,

ALM3 not used

OFF OFF OFF

ON

OFF OFF OFF

Enabled,

ALM1=35%,
ALM2 not used
ALM3 not used

OFF

Enabled,

no alarms

enabled,

fault relay is

activated

ON

ON

ON
ON

Enabled,
too many

levels

enabled,

fault relay is

activated

The 4-20mA input from ‘Enabled’ channels is monitored by the controller. If the input on a channel is less
than 2.2mA, the fault relay is activated. The fault relay is also activated if a channel is enabled, but no alarm
levels or too many alarm levels have been enabled. If a channel is disabled, its 4-20mA input is not
monitored.

3.2 Alarm Configurations

The alarm relays for alarms 1, 2, and 3 each have a DIP switch bank with three switches that are used to
configure the relays. The Fault relay has a DIP switch with one active switch that controls the fault
configuration. Alarms 1, 2, and 3 can be configured as Silencable, Non-Silencable, Latching, Non-Latching,
Energized, or Non-Energized. The Fault relay can only be configured as Latching or Non-Latching. Each
relay provides the customer with a set of dry contacts. The contacts are Common, Normally Open, and
Normally Closed, labeled ‘C’, ‘NO’, and ‘NC’ respectively.

Silencable

ON OFF

Latching

Energized

ALARM 1

Latching

Not Used

FAULT

Figure 3 Alarm Configuration DIP Switches

ON OFF

Silencable
Latching
Energized

ALARM 2

Silencable
Latching
Energized

ALARM 3

Four Channel Relay Card Instruction Manual Rev.1.2 Page 4 of 8

4 Channel Relay Card

3.2.1 Silencable or Non Silenceable

Alarms 1, 2, and 3 can be configured as Silencable or Non-Silenceable. In order for an alarm to be
Silenceable, the corresponding DIP switch must be set to Silenceable, and an external ‘Normally Open,
Momentary Closed Switch’ must be connected to the ‘Reset’ connector on the Relay Card. If an alarm relay is
configured as Silenceable and it is in an alarm state, it can be returned to its normal state (silenced) by
activating the external reset switch. If a relay is configured as Non-Silenceable and is in an alarm state, the
activation of the external reset switch has no effect. The ‘Fault’ alarm cannot be silenced.

If a relay has been silenced and the sensor input drops below the alarm level the alarm will

NOTE:

reset. If the sensor input again rises above the alarm level the relay will again enter an
alarm state. If another sensor (one that did not cause the original alarm) goes into alarm,
then the relay will be reactivated.

3.2.2 Latching or non-Latching Relays

Alarms 1, 2, and 3 can be configured as Latching or Non-Latching. If a relay is configured as Non-Latching,
the relay returns to its normal state once the alarm has cleared or passed. If the alarm is set as Latching the
relay remains in the alarm state even after the alarm has cleared. An alarm that is set as ‘Latching’ can only be
returned to its normal state by activation of an external reset switch.

3.2.3 Energized or Non-Energized

Alarms 1, 2, and 3 can be configured as Energized or Non-Energized. The standard is Non-Energized.
However, a relay can be configured as energized to provide application specific features. A normally
energized relay will de-energize when in alarm. A typical application of the energized configuration is to have
the alarm relay normally energized so that in the event of a power failure to the control module card, the alarm
relay will de-energize causing its relay contacts to change state, thereby creating an alarm output.

3.2.4 Fault

The only configuration option for the fault relay is latching or non-latching. If the Fault alarm is configured as
‘Latching’ the fault relay will energize whenever a fault occurs, and will remain latched (energized) until the
fault has cleared, and the ‘Reset Switch’ has been pushed. The ‘Fault’ alarm cannot be silenced.

 The fault circuitry monitors the sensors attached to the controller. If a sensors mA input falls below

2.2mA the fault circuitry will generate a ‘Fault’.

 If a sensor is attached to the Relay Card, with no alarm levels or more than three alarm levels

configured, the card will generate a ‘Fault’

3.3 Reset

The reset connector provides connections for an external ‘Normally Open, Momentary Closed Switch’. This
switch is used to reset and/or silence alarms if the alarms are set as latching, and/or Silenceable.

Four Channel Relay Card Instruction Manual Rev. 1.2 Page 5 of 8

4 Channel Relay Card

4.0Troubleshooting Guide

Problem Potential Cause(s)

More than 3 alarm levels are set on an active channel

Fault active

Sensors not receiving power

Alarm Relay Active when sensor(s) is not in
alarm

For further troubleshooting assistance, contact Detcon Service Department at [e-mail], or contact
Detcon customer service.

No alarm levels are set on an active channel
4-20mA input is not connected to the Channel
4-20mA input is below 2.2mA – fix/replace sensor
Sensor not connected correctly
Input voltage to Relay Card is not correct level (12-28 VDC)
Connector wired incorrectly
Relay is set for energized
Relay connector wired incorrectly

5.0Specifications

Capacity

Up to 4 4-20mA input devices

Indicators:

Power Indicator LED
3 Alarm Status LED’s
1 Fault Status LED
Channel Indicator LED’s

Detection Accuracy

+/2 2% of full scale value between 10% and 60%

Input Options:

Analog 4-20 mA DC

Output Options

Programmable Relay Contacts

Relays rated 5A @ 30VDC/250VAC

Warranty

One Year

Mechanical Specifications

Dimensions 4.5” x 5”

Electrical Specifications

Power Consumption

12-28VDC @ 800 mA max (Including Sensors)

5.1 Parts List

Part Number Description

306-177984-800 3-Pin Connector
306-175701-900 2-Pin Connector
440-005155-000 Four Channel Relay Card

Four Channel Relay Card Instruction Manual Rev.1.2 Page 6 of 8

4 Channel Relay Card

6.0 Warranty

Detcon, Inc., as the manufacturer, warrants under intended normal use each new Four Channel Relay Card to
be free from defects in material and workmanship for a period of one year from the date of shipment to the
original purchaser. Should the Relay Card fail to perform in accordance with published specifications within
the warranty period, return to Detcon, Inc., for necessary repairs or replacement. All warranties and service
policies are FOB the Detcon facility located in The Woodlands, Texas.

Four Channel Relay Card Instruction Manual Rev. 1.2 Page 7 of 8

4 Channel Relay Card

7.0Revision Log

Revision Date Changes made Approval

1.1 04/18/12 Updated with corrections LU

1.2 03/19/14 Updated, & reformatted with various corrections and clarifications LU

Shipping Address 4055 Technology Forest Blvd. Suite 100,., The Woodlands Texas77381

Phone: [phone] • Fax: [phone] • www.detcon.com • [e-mail]

Four Channel Relay Card Instruction Manual Rev.1.2 Page 8 of 8

Mailing Address: P.O. Box 8067, The Woodlands Texas 77387-8067