Connecting Optional Relays & Remote Alarm Reset - Teledyne Meridian User Manual

MERIDIAN
UNIVERSAL GAS DETECTOR
INSTALLATION
4.1.21 Connecting a Device to Other Teledyne Gas & Flame Detection Receivers
To connect the device to various Teledyne Gas & Flame Detection receivers (controllers), use MODBUS 12-bit
resolution to ensure compatibility. Refer to following applicable sections based on your application. See
4.1.18 Connecting a Device to a Power Supply & Receiver:
Power Supply: 2-wire, and
CAUTION: Ensure you remap the MODBUS registers when retrofitting the device with an existing
Teledyne Gas & Flame Detection controller that supports MODBUS registers.
4.1.22 Connecting Optional Relays & Remote Alarm Reset
To connect the relays and the remote alarm reset, follow the steps below (this feature is optional).
1. The terminal/relay/MODBUS RS-485 PCB contains four (4) relays (K1, K2, K3 and K4) and a remote reset.
2. Ensure you have already made the proper connections prior to connecting the terminal/relay/MODBUS RS-
485 PCB (refer to Section 4.1.18 Connecting a Device to a Power Supply & Receiver: 3-wire
4.1.21 Connecting a Device to Other Teledyne Gas & Flame Detection
WARNING: ENSURE RECEIVERS AND POWER SUPPLIES ARE NOT POWERED WHEN
INSTALLING PCB INTO THE DEVICE. FAILURE TO DO SO COULD RESULT IN INJURY OR
DEATH.
WARNING: ENSURE THE ATMOSPHERE IS FREE FROM COMBUSTIBLE AND/OR TOXIC
GASES PRIOR TO STARTING THIS PROCEDURE. FAILURE TO DO SO COULD RESULT IN INJURY
OR DEATH.
3. Route wires of appropriate size from source through conduit runs into the device housing (see Field Wiring in
Appendix A.1. Device
4. Unscrew the setscrew and housing cover, then pull on the LCD PCB/CPU PCB set, removing it from the four (4)
standoffs, to gain access to the lower PCB stack.
NOTE: It is not necessary to remove the wire ribbon cable from the upper and lower PCB stacks.
5. If desired, connect the wiring from the receiver equipment to one or more of the four (4) relays on the terminal/
relay/MODBUS RS-485 PCB. Relays are designated ALARM1 (TB5, K1 for Relay1), ALARM2 (TB6, K2 for
Relay2), ALARM3 (TB7, K3 for Relay3) and FAULT (TB8, K4 for Relay4). Each relay has three (3) pins for wir-
ing; a Normally Open (NO), a Normally Closed (NC), and a Common (C) (refer to
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4-36
Section 4.1.20 Connecting a Device to a Power Supply & Receiver:
Specifications).
USE AND DISCLOSURE OF DATA
prohibited.
3-wire, Section 4.1.19 Connecting a Device to a
Receivers).
Section
4-wire.
and Section
Figure 4-19: Relay/