Wiring Alarm Output (Analog Signal); Wiring The Digital Alarm Output Relay - Emerson MRLDS-250 Installation And Operation Manual

WARNING: The MRLDS-250 must be
powered by either:
• A suitable UL 60950/CSA certified power supply
that is isolated from line voltage by double insulation,
or
• An appropriately rated UL listed/CSA Class 2
transformer.
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
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.
8 • MRLDS-250 Gas Detector Manual
Figure 3-4 Analog Output Wiring
Function Pin
Analog Analog output ground
5
Output 6 Analog output signal (+)
Table 3-2 Alarm Output Terminal Block Connections
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.
Wiring Termination
026-1315 Rev 2 11-APR-2017