Johnson Controls Metasys VMA1610 User Manual

VMA Terminal Functions, Ratings,
Requirements, and Wiring Guidelines
Input and Output Wiring Guidelines
Table 1 provides information about the functions, ratings,
and requirements for the VMA input and output terminals;
and references guidelines for determining proper wire
sizes and cable lengths.
In addition to the wiring guidelines in Table 1, observe
these guidelines when wiring VMA inputs and outputs:
• Run all low-voltage wiring and cables separate from
high-voltage wiring.
• All input and output cables, regardless of wire size or
number of wires, should consist of twisted, insulated,
and stranded copper wires.
• Shielded cable is not required for input or output
cables.
• Shielded cable is recommended for input and output
cables that are exposed to high electromagnetic or
radio frequency noise.
• Cable runs that are less than 30 m (100 ft) typically
do not require an offset in the input/output software
setup. Cable runs that are over 30 m (100 ft) may
require an offset in the input/output software setup.
Table 1: I/O Terminal Blocks, Functions, Ratings, Requirements, and Cables
To Determine Wire Size and
Maximum Cable Length
Function, Ratings, and RequirementsTerminal
Labels
Terminal Block
Label
Same as (Universal) INn.
Note: Use 3-wire cable for
devices that source power from
the +15 V terminal.
15 VDC Power Source for active (3-wire) input devices
connected to the Universal INn terminals.
Provides 100 mA total current.
+15 VUNIVERSAL
(Inputs)
See Guideline A in Table 2.
Analog Input - Voltage Mode (0–10 VDC)
10 VDC maximum input voltage
Internal 75k ohm Pulldown
INn
See Guideline A in Table 2.
Analog Input - Resistive Mode (0–600k ohm)
Internal 12 V, 15k ohm pull up
Qualified Sensors: 0–2k potentiometer,
RTD (1k Nickel [Johnson Controls sensor],
1k Platinum, and A99B Silicon Temperature Sensor)
Negative Temperature Coefficient (NTC) Sensor
10K Type L (10K JCI Type II is equivalent to Type L) or
2.252K Type II
Same as (Universal) INn.
Universal Input Common for all Universal IN terminals
Note: All Universal ICOMn terminals share a common,
which is isolated from all other commons.
ICOMn
7VMA1610 and VMA1620 Variable Air Volume Controllers Installation Instructions

Johnson Controls Metasys VMA1610 Specifications

General

Brand	Johnson Controls
Model	Metasys VMA1610
Category	Controller
Language	English