Contrec 515 FA01, Operation Manual

Page: 28 / 98

Installation & Maintenance
18 515 FA01 - 29 August 2021
Control Relays (Alarms)
The standard instrument has two alarm relays, which can be used to drive
external devices such as external relays, LEDs, and audible alarms. The
advanced option has four alarm relays.
The operation of each alarm relay can be set to various modes as described
in
Alarms on page 45. On the newer option card the separate common
terminal for relays 1 and 2 and another common terminal for relays 3 and 4
allow for different signal or supply types to be connected to the control or
alarm devices, as shown in Figure 13.
There is also an equipment failure alarm option. This alarm can have
normally closed (open) contacts which open (close) when the instrument
displays any error message as listed in
Error Messages on page 55, or if
there is a loss of power to the instrument.
The output characteristics of the relays are:
Note: Solid state relays (SSR) use AC voltage only.
Figure 13 Relay Connection Diagram
Maximum Voltage 30 volts DC or 250 volts AC
Maximum Current 3 A for EMR, 1.5A for SSR
Supply
Alarm/Load
Relay 1
Relay 2
Relay 3
Relay 4
Alarm/Load
Alarm/Load
Alarm/Load
R2
R1
R3
R4
RC
Relay 1-2 Common
MOV
MOV
MOV
MOV
500
Supply
1-2
3-4
RC
Relay 3-4 Common