4.CONNECTIONS

4.5 Alarm Output Terminals

These terminals are for the alarm output (option), which is (1) MOS relay type, (2) mechanical relay “c” contact type or (3) mechanical relay “a” contact type. The mechanical relay “c” contact type does not conform to the international safety standards.

1Alarm output terminals

The terminal arrangement depends upon the type of alarm output.

Terminal and relay No.

Terminal block

RD200

RD2800

1

No. 1 to 6

No. 1 to 6

 

 

 

2

 

No. 1 to 12

 

 

 

[Remarks]Only one terminal block is provided for the remote contacts terminals.

2Connections

MOS relay/Mechanical

relay “a” contact

Remote contacts

1 2 3 4 5 6

N.O

COM

Mechanical relay “c”

contact

Remote 1 2 3 4 5 6 contacts

N.O

COM

N.C

Turn off the power supply and buffer relay power supply before the connections for preventing an electric shock.

(1)Connect cables to a load via a buffer relay.

(2)Use cables with crimp style terminals and insulation sleeves for the alarm output terminals.

Caution Take safety measures.

The alarm output of your recorder may

Your recorder

N.O

COM

N.C

*

Buffer relay

b a

Power supply

Load

 

:Contact protective element (It is recommended to mount this element on the “a” side.)

become defective. This may be caused by wrong operation, failure or other abnormal inputs. Take safety measures against an output failure before use if necessary.

*N.C terminal: Only for the mechanical relay “c” contact output

3

Cautions on connections

 

Warning

mark for alarm output terminals

 

A buffer relay power supply is applied to the

 

1) Output contact rating

 

alarm output terminals after connections. Don’t

 

(1) MOS relay

 

 

 

touch these terminals for preventing an electric

 

Maximum voltage

240 V (AC, DC)

shock. Make sure to mount the terminal cover

 

after connection.

 

 

Maximum current

50 mA (AC, DC)

 

 

 

 

 

 

 

 

 

2) Mounting of contact protective element

 

(2) Mechanical relay

 

 

(1) Mount a contact protective element

 

Power supply

Resistive load

Inductive load

conforming to the buffer relay.

 

(2) To prevent a malfunction being caused by a

 

100 VAC

 

0.5 A

0.2 A

 

 

light load, the most effective mounting position

 

240 V AC

 

0.2 A

0.1 A

 

 

for the element is on the coil side of the buffer

 

100 V DC

 

0.3 A

0.1 A

relay ('a' in the above diagrams)

 

 

 

 

 

(3) The MOS relay will be broken, even if a

 

 

 

 

 

signal exceeding the contact rating is

 

 

 

 

 

momentarily applied.

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Omega RD2800, RD200 manual Alarm Output Terminals, Alarm output terminals, Connections, Output contact rating