Metasys NCM-1 Reference guide

IFC-1010/2020 Technical Manual 448
Hardware Installation Section
Technical Bulletin
Issue Date 0401
©2001 Johnson Controls, Inc. 1
NCM-1 and CAP-1 Installation Procedures
NCM-1 and CAP-1 Installation Procedures Page 3
• NCM-1 Installation *3
• CAP-1 Installation *5
Code No. LIT-448161 www.johnsoncontrols.com

2 Hardware Installation—NFM-1 and CAP-1 Installation Procedures

Hardware Installation—NFM-1 and CAP-1 Installation Procedures 3
NCM-1 and CAP-1 Installation
Procedures
The NCM-1 Noise Filter Module reduces common mode noise (noise
present on both conductors) on the SLC (Signaling Line Circuit). To
comply with FCC (Federal Communications Commission) requirements
for radiated energy, you must use the NCM-1 in all IFC-1010/2020
applications where the wiring does not consist of a twisted/shielded pair.
Refer to Figure 1 for wire designations. If any portion of the SLC cable is
both twisted and shielded, an NCM-1 must be located at the
IFC-1010/2020 panel and connected to the SLC.
NCM-1
Installation
SLC "-" (black)
Shield (white)
SLC "+" (red)
SLC "-" (black)
Shield (white)
SLC "+" (red)
For IFC-1010/2020 systems without a shield:
cut the NCM-1 shield (white wire) and insulate
with electrical tape.
Nfmnoise
Figure 1: Installing the NCM-1 Noise Filter Module
For information on maximum SLC wiring impedance, refer to the
Installing the IFC-1010/2020 Technical Bulletin (LIT-448155) in the
Hardware Installation section of this manual.
To ensure proper system operation, follow the wiring specification
outlined in Table 1. This table lists the maximum total cable used for each
SLC channel based on the specific installation configuration.
Speakers produce more noise than the NCM-1 can handle reliably.
Therefore, if speakers are used, and speaker circuits run in the same
conduit with SLC circuits, install the SLC with twisted, shielded pair
cable. Speaker circuit cables always should be twisted, shielded cable to
prevent cross-talk between speaker/phone circuits or noise induced
problems on the SLC.
When you do not plan to install an AMG-1 or FFT-7, use Table 1 to
determine the maximum total cable used for each SLC in your system.

4 Hardware Installation—NFM-1 and CAP-1 Installation Procedures
Table 1: IFC-1010/2020 SLC Wiring Specifications (No Audio)
Conduit Shield Twisted
Pair Number Of SLCs Maximum Total SLC Cable
No No No 1
2 or more 305 m (1,000 ft.) 229 m/loop (750 ft.)
No No Yes 1
2 or more 610 m (2,000 ft.) 610 m/loop (2,000 ft.)
No Yes No 1
2 or more 610 m (2,000 ft.) 610 m/loop (2,000 ft.)
Yes Yes No 1
2 or more 1,524 m (5,000 ft.) 610 m/loop (2,000 ft.)
Yes No Yes 1
2 or more 3,048 m (10,000 ft.) 914 m/loop (3,000 ft.)
Yes No No 1
2 or more 610 m (2,000 ft.) 152 m/loop (500 ft.)
No Yes Yes 1
2 or more 3,048 m (10,000 ft.) 3,048 m/loop (10,000 ft.)
Yes Yes Yes 1
2 or more 3,048 m (10,000 ft.) 3,048 m/loop (10,000 ft.)
Note: This table is only applicable to the LIB-200.
Select the wire size of the SLC so that the maximum total resistance of the
SLC loop, if it is wired Style 6 or any branch, if it is wired Style 4, does
not exceed 40 ohms. For the proper method of determining SLC
resistance, see Figures 49 and 50 in the Installing the IFC-1010/2020
Technical Bulletin (LIT-448155). Place the NCM-1 at the control panel.
When wiring the SLC Style 6, connect an NCM-1 to each end of the SLC
at the control panel.

Hardware Installation—NFM-1 and CAP-1 Installation Procedures 5
CAP-1
Installation The CAP-1 filters out high frequency AC interference between the earth
ground and the system common within the same cabinet (one power
supply). The CAP-1 is not polarized.
Cap1cap
Figure 2: CAP-1 0.1uF (microfarads) Capacitor
In all IFC-1010/2020 systems, it is a good practice to install a CAP-1
between the system common and earth ground only on the main power
supply powering the CPU-1010 or CPU-2020. Do not install a CAP-1 on
any of the remotely located main power supplies. Use Table 2 as a
reference for earth ground and system common terminal assignments on
the MPS-24A.
System Common
to Earth Ground
Table 2: Earth Ground and System Common Terminal
Assignments
Power Supply System Common
(Battery Negative) Earth Ground
MPS-24A TB2 Terminal 2 TB1 Terminal 2

6 Hardware Installation—NFM-1 and CAP-1 Installation Procedures
Notes

Hardware Installation—NFM-1 and CAP-1 Installation Procedures 7
Notes

8 Hardware Installation—NFM-1 and CAP-1 Installation Procedures
Notes
Controls Group www.johnsoncontrols.com
507 E. Michigan Street FAN 448
P.O. Box 423 IFC-1010/2020 Technical Manual
Milwaukee, WI 53201 Printed in U.S.A.