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3.2 CARD RACK MODULE (NGC-30-CRM/-CRMS) AND CURRENT TRANSFORMER MODULE (NGC-30-CTM)
Each Card Rack Module (NGC-30-CRM and NGC-30-CRMS) and Current Transformer Module
(NGC-30-CTM) provide ground-fault and line current sensing, alarming, switching, and RTD
input for five Loops. The NGC-30-CRM is used with electromechanical relays. The NGC-30-
CRMS is used with solid-state relays. The NGC-30-CRM/-CRMS may be connected to one
User Interface Terminal (NGC-UIT2).
Each NGC-30-CRM/-CRMS must have a unique communication address. The valid address
switch range for the NGC-UIT2 is 1–99. SW1 is the ones digit (0–9) and SW2 is the tens digit
(0–9). See Fig. 3.6.
IMPORTANT: RMM2s use ModBus addresses 32 through 47 and PLIs use Modbus addresses
1-99. When using RMM2s and PLI modules in an NGC-30 system, care must be taken to not
assign the same addresses to an RMM2, PLI module or an NGC-30-CRM/-CRMS board.
LSBMSB
SW1SW2
3
8
Fig. 3.4 Communication address switch
IMPORTANT: When adding an NGC-30-CRM/-CRMS to the system, power must be cycled to
the board and a network update on the NGC-UIT2 must be performed.
Alarm output
Relay outputs (5x)
LEDs (9x)
Fuse
6 754321 8
9
10
End of Line (EOL) jumper
RS-485 Communications
Line & ground-fault sensor inputs (5x)
RTD Inputs
Address Switches
NGC-30-CRM/-CRMS
TB 12
MSB LSB
TB 7 TB 6
TB 13 TB 14 TB 15 TB 16 TB 17
TB 1 TB 2 TB 3 TB 4 TB 5
TB 19
1 2 3
1
2
3
4
6
7
8
9
Fig. 3.5 NGC-30-CRM/-CRMS Board l Layout
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