Fluid Components International MT91 Manual Installation - Manual (Page 9)

Doc. No. 003185 Rev. B 2 - 9 Model MT91 Multipoint Flowmeter
CHAPTER 2 - INSTALLATION FLUID COMPONENTS INTL
Relay Output Board - Assy #015235 (see Figure 2-3 for location)
One relay output board supports up to 2 relays. Relays 3 and 4 are not associated with Analog Output Channels and
are optional.
Connector J1
This connector interfaces with the flow transmitter backplane board.
Relays 1 and/or 2 Relay Board J1 connects to Backplane Board J21
Relays 3 and/or 4 Relay Board J1 connects to Backplane Board J22
Connector J2
This connector provides the relay outputs for relay 1 or 3, depending on which backplane connector J1 is associated.
Refer to Table 2-3 for signal information.
Connector J3
This connector provides the relay outputs for relay 2 or 4, depending on which backplane connector J1 is associated.
Refer to Table 2-3 for signal information.
Table 2-3. Connector J2 and J3 Signal Information
Signal (Power Isolated) Description
EXT1- Relay 1 external signal drive signal.
Open collector of NPN transistor.
+30 Vdc Max.
EXT1+ Fused connection to +24 Vdc Fuse rating is 1/16 A (62.5 mA)
NC1A Relay 1A Normally Closed terminal.
Continuity with COM1A when
relay is de-energized
COM1A Relay 1A Common terminal.
NO1A Relay 1A Normally Open terminal.
Continuity with COM1A when
relay is energized.
NC1B Relay 1B Normally Closed terminal.
Continuity with COM1B when
relay is de-energized.
COM1B Relay 1B Common terminal.
NO1B Relay 1B Normally Open terminal.
Continuity with COM1B when
relay is energized.
EXT2- Relay 2 external signal drive signal.
Open collector of NPN transistor.
+30 Vdc Max.
EXT2+ Fused connection to +24 Vdc. Fuse rating is 1/16 A (62.5 mA)
NC2A Relay 2A Normally Closed terminal.
Continuity with COM2A when
relay is de-energized
COM2A Relay 2A Common terminal.
NO2A Relay 2A Normally Open terminal.
Continuity with COM2A when
relay is energized.
NC2B Relay 2B Normally Closed terminal.
Continuity with COM2B when
relay is de-energized.
COM2B Relay 2B Common terminal.
NO2B Relay 2B Normally Open terminal.
Continuity with COM2B when
relay is energized.