Alarm Output Terminals - Omega RD2800 Series User Manual

4. CONNECTIONS
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.
1

Alarm output terminals

The terminal arrangement depends upon the type
of alarm output.
Terminal and relay No.
Terminal block RD200
1 No. 1 to 6
2
[Remarks]Only one terminal block is provided for
the remote contacts terminals.
2 Connections
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
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.
3 Cautions on connections
1) Output contact rating
(1) MOS relay
Maximum voltage
Maximum current
(2) Mechanical relay
Power supply Resistive load
100 VAC 0.5 A
240 V AC 0.2 A
100 V DC 0.3 A
4.5 Alarm Output Terminals
RD2800
No. 1 to 6
No. 1 to 12
240 V (AC, DC)
50 mA (AC, DC)
Inductive load
0.2 A
0.1 A
0.1 A
－１７－
MOS relay/Mechanical
relay "a" contact
Remote
contacts
1 2 3 4 5 6
1 2 3 4 5 6
N.O
COM
Your recorder
b
N.O
COM
N.C
Power supply
*
: Contact protective element (It is
recommended to mount this
element on the "a" side.)
* N.C terminal: Only for the mechanical relay "c" contact
output
Warning
mark for alarm output terminals
A buffer relay power supply is applied to the
alarm output terminals after connections. Don't
touch these terminals for preventing an electric
shock. Make sure to mount the terminal cover
after connection.
2) Mounting of contact protective element
(1) Mount a contact protective element
conforming to the buffer relay.
(2) To prevent a malfunction being caused by a
light load, the most effective mounting position
for the element is on the coil side of the buffer
relay ('a' in the above diagrams)
(3) The MOS relay will be broken, even if a
signal exceeding the contact rating is
momentarily applied.
Mechanical relay "c"
contact
Remote
contacts
1 2 3 4 5 6
N.O
COM
N.C
Buffer relay
a
Load