nVent.com|3
Power Supply
Thepowersupplyconnector(TB19)isa
dualtwopinconnector.Eitherconnector
allowsforpowerin(pin#1(+),pin#2(–)
andbussingofpowertootherNGC-30-CRM
modules).
Note:
Powersupplymustbesizedcorrectly
basedonthenumberofNGC-30-CRM/-
CRMSmodules.
RS-485 Communications
ThenVentRAYCHEMRS-485connector
(TB6)isadualthreepinconnector.Either
connectorallowsforRS-485inputsignals
(pin#1(shield),pin#2(+),pin#3(–))and
bussingofRS485signaltootherNGC-30-
CRMmodules.
End of Line (EOL) Jumper
Ifthisdevice(NGC-30-CRM/-CRMS)isthe
lastdeviceintheRS-485network,theJ1
jumperneedstobemovedfromterminals2
&3toterminals1&2.
RTD Inputs – Ordinary Area
1 2 3 4
per each NGC-30-CRM board
3wirenVentRAYCHEMRTDswithshield
maybeconnectedtoRTDCh1thruCh5
(TB1-TB5).Thetwocommonwires(usually
red,red)areconnectedtoterminals2&3,
thesource(usuallywhite)toterminal1and
thebraidtoterminal4(earthground).
Note:
RTD'sarenotrequiredifmonitoring
current/ground-faultsonlyorifRTD'sare
connectedviaRMM2s.
RTD Inputs – Hazardous Area
11
22
33
44
Factory wired
Factory wired
Terminal
block
Terminal
block
Hazar
dous ar
ea
Hazar
dous ar
ea
RTD
RTD
NGC-30-CRM/CRMS Board
NGC-30-CRM/CRMS Board
ForallRTDterminationsina
hazardousarea,theRTDfield
wiresmustbeterminatedona
panel-mountedterminalblock.
Relay Output Connections to 111
Contactors or Solid State Devices (TB7)
Thisconnectorswitchesvoltagetothe
contactorcoilsorsolidstaterelays.Thepilot
relaywillswitchthesupplyvoltage(upto
277Vac)tothecontactorcoil(usinganNGC-
30-CRM)or12Vdctothesolidstatedevice
(usinganNGC-30-CRMS).
Refertosystemlayoutdiagramfordetail
wiring.
Common Alarm
Thecommonalarmterminalblock(TB12)
providesaformCdrycontact,ratedat277
Vacmax(3A).
WhentheRAYCHEMNGC-30systemis
poweredon,thecommonalarmrelaycoil
isenergizedandpin2isconnectedtopin1
(common).Thisisthe"NoAlarm"condition
fortheCRM/CRMSboard.
Ifthealarmoccurs,ortheCRM/CRMSboard
losespower,therelaycoilisde-energizedandpin1(common)
isdisconnectedfrompin2andconnectedtopin3toindicatean
alarmconditionexits.
Address Switches (SW1 & SW2)
EachNGC-30-CRM/-CRMSmusthavea
uniquecommunicationaddressselected.
Thevalidaddressswitchrangewhenusing
theNGC-UITis1-99.SW1istheonesdigit
(0–9)andSW2isthetensdigit(0or9).
Note:
WhenaddinganNGC-30-CRM/-
CRMStothesystem,youmustfirstcycle
powerontheCRM/CRMSboardandthen
performanetworkupdateattheNGC-UIT.
Optional Voltage Sensor Cable Preparation
Notes:
1. Cutoneendoffofaground-
fault/linecurrentcable.
2. Stripinsulationapprox.1
inchfromcutend.
3. Striptheredandblackwire
insulationapprox.0.20in.
4. Connectredandblackwire
tothetwopositionterminal
plug.Noneedtobe
concernedaboutpolarity.
5. Trimbrownandorangewiresfromcutend.
Optional Voltage Sensor
Theoptionalvoltagesensor
canmonitor80–290Vac.This
voltageconnectstooneofthe
fivelinecurrent/ground-fault
inputsontheNGC-30-CRM.
Note:
Byusingtheoptional
voltagesensor,youlosethe
abilitytomonitortheground-
faultandcurrentforthatcircuit.
1
2 1 2
1 2 3
1 2 3
Normal
position
End of Line
position
3
2
1
3
2
1
11
22
33
44
RTD1
RTD1
Shield
Shield
RTD connected directly to CRM board
RTD connected directly to CRM board
RTD
RTD
11
22
33
44
RTD2
RTD2
Shield
Shield
RTD
RTD
11
22
33
44
RTD3
RTD3
Shield
Shield
RTD
RTD
11
22
33
44
RTD4
RTD4
Shield
Shield
RTD
RTD
11
22
33
44
RTD5
RTD5
Shield
Shield
Chassis Ground
Chassis Ground
CRM
PCB
CRM
PCB
RTD
RTD
12-RLY4
6-RLY5
10-RLY3
8-RLY2
1 2 3 4 5 6
7 8 9 10 11 12
3-RLY1
1-COM
3
2
1
Open
Closed
CO
M
LSB
MSB
SW1
SW2
3
8
Relay “No Alarm”
Condition
1 in
0.2 in
Red and
black wires
Brown and
orange wires
