Communication bus and supply power table - Metasys - MS-VMA1826-x - MS-VMA1832-x - Field Device

Communication bus and supply power table - Metasys - MS-VMA1826-x - MS-VMA1832-x - Field Device - VMA18 VAV Modular Assembly

VMA1826/1832 VAV Controller Installation Guide

Product

Variable Air Volume > Modular Assemblies > VMA18 VAV Modular Assembly

Document type

Installation Guide

Document revision

Revision date

2019-10-18

docpartnumberlabel

Part No.

Part number

24-10143-373

Table 1. Communication bus and supply power terminal blocks, functions, ratings, requirements, and cables
Terminal block/Port label	Terminal labels	Function, electrical ratings/Requirements	Recommended cable type
N2/FC BUS ²	+ -	N2/FC Bus Communications	Use existing cable or 18 AWG
	COM	Signal Reference (Common) for bus communications
	SHLD	Isolated terminal (optional shield drain connection)
SA BUS	+ -	SA Bus Communications	0.6 mm (22 AWG) stranded, 4-wire (2 twisted-pairs), shielded cable recommended Note: The + and - wires are one twisted pair, and the COM and SA PWR are the second twisted pair.
	COM	SA Bus Signal Reference and 15 VDC Common
	SA PWR	15 VDC Supply Power for Devices on the SA Bus
TSTAT	TSTAT	RJ-45 8-Position Modular Connector provides +15 VDC Power for: BTCVT ³ MAP Gateway VAV Balancing Tool One-to-One Wireless Receiver	24 AWG 3-pair CAT 3 Cable <30.5 m (100 ft)
24~	HOT	24 VAC Power Supply - Hot Supplies 20–30 VAC (Nominal 24 VAC)	0.8 mm to 1.0 mm² (20 to 18 AWG) 2-wire
24~	COM	24 VAC Power Supply Common The -0 models isolate this terminal from all other commons. The -1 models only isolate this terminal from the FC bus common.	0.8 mm to 1.0 mm² (20 to 18 AWG) 2-wire

¹ To determine wire size and cable lengths for cables other than the recommended cables, see Table 2.

² The N2/FC Bus wiring recommendations in this table are for N2 bus communications at 9,600 baud. For more information, refer to the N2 Communications Bus Technical Bulletin (LIT-636018).

The MAP Gateway serves as a replacement for the BTCVT, which is no longer available for purchase, but continues to be supported on select controllers.