Emerson MRLDS-250 - Wiring Alarm Output (Analog Signal ); Wiring the Digital Alarm Output Relay

WARNING: The MRLDS-250 must
be powered by either:
• A suitable UL 60950/CSA certified
pow
er supply that is isolated from
line voltage by double insulation, or
• An appropriately rated UL listed/CSA
Class 2 tra
nsformer.
Failure to comply can result in personal
injury or death.
WARNING: Neutral polarity must
be maintained across units. Refer to
Figure 3-3.
Figure 3-3 - Maintaining Neutral Polarity
10 • MRLDS-250 Infrared Gas Detector I&O Manual 026-1315 Rev 4
3.3. Wiring Alarm Output
(Analog Signal)
The MRLDS-250 provides an analog output signal
that is proportional to the level of gas detected.
NOTE: No jumpers or hardware
switch settings are required to
configure the analog output. This
is done electronically from the
front panel display.
Connect two 18 to 20 AWG wires to terminal block
positions 5 and 6 (see Figure 3-4), noting ground and
signal polarity per Table 3-2.
Figure 3-4 - Analog Output Wiring
Table 3-2 - Alarm Output Terminal Block
Connections
Function Pin
Wiring
Termination
Analog 5 Analog output ground
Output 6 Analog output signal (+)
The type of output signal on pins 5 and 6 is
programmable using the analog output type parameter
P.-03. Refer to Section 5, Configure the Gas Detector
for details.
3.4. Wiring the Digital
Alarm Output Relay
An alarm setpoint may be programmed from the front
panel of the MRLDS-250. When the level of the
detected gas exceeds the alarm setpoint, the MRLDS-
250 enters the alarm state. An on-board relay is tied to
the alarm state, so you may activate (or deactivate)
external equipment based on the MRLDS-250’s
current alarm status.