KMC Controls BAC-7302 Operating instructions

Section 1
About the BAC-7302
Specifications ........................................................................................................................ 3
Accessories ............................................................................................................................ 6
Safety considerations ..........................................................................................................7
Section 2
Installing the controller
Mounting .............................................................................................................................. 9
Connecting inputs ............................................................................................................... 9
Connecting outputs ........................................................................................................... 10
Connecting to a NetSensor ............................................................................................... 11
Connecting to an MS/TP network .................................................................................. 11
Connecting power ............................................................................................................. 13
Programming ..................................................................................................................... 14
Section 3
Operating the controller
Operation ............................................................................................................................ 15
Controls and Indicators .................................................................................................... 15
Restoring factory settings ................................................................................................. 18
Installation and Operation Guide
BAC-7302 and BAC-7302C
Advanced Applications Controller
905-019-53ERevision E

KMC Controls
Revision E2
Important notices
©2012, KMC Controls, Inc.
WinControl XL Plus, NetSensor, and the KMC logo are registered trademarks of KMC Controls, Inc.
BACstage and TotalControl are trademarks of KMC Controls, Inc.
MS/TP automatic MAC addressing is protected under United States Patent Number 7,987,257.
All rights reserved. No part of this publication may be reproduced, transmitted, transcribed, stored in a
retrieval system, or translated into any language in any form by any means without the written permission of
KMC Controls, Inc.
Printed in U.S.A.
Disclaimer
The material in this manual is for information purposes only. The contents and the product it describes are
subject to change without notice. KMC Controls, Inc. makes no representations or warranties with respect to
this manual. In no event shall KMC Controls, Inc. be liable for any damages, direct or incidental, arising out of
or related to the use of this manual.
KMC Controls
P. O . B o x 4 9 7
19476 Industrial Drive
New Paris, IN 46553
U.S.A.
TEL: [phone]
FAX: [phone]
E-mail: [email protected]

BAC-7302 RTU Controller
Revision E 3
SECTION 1
About the BAC-7302
This section provides a general description of the KMC Controls
BAC-7302 controller. It also introduces safety information. Review
this material before installing or operating the controller.
The BAC-7302 is a native BACnet, fully programmable controller designed for roof
top units. Use this versatile controller in stand-alone environments or networked to
other BACnet devices. As part of a complete facilities management system, the
BAC-7302 controller provides precise monitoring and control of connected points.
◆BACnet MS/TP compliant
◆Automatically assigns the MAC address and the device instance
◆Triac outputs for fan control, two-stage heating and two-stage cooling
◆Supplied with programming sequences for roof top units
◆Easy to install, simple to configure, and intuitive to program
◆Controls room temperature, humidity, fans, monitors refrigeration, lighting,
and other building automation functions.
Specifications Inputs
Universal inputs 4
Key features Software selectable as analog, binary or accumulator
objects. Accumulators limited to three in one
controller.
Standard units of measure.
NetSensor compatible
Overvoltage input protection
Pull–up resistors Switch select none or 10k.
Connector Removable screw terminal block, wire size
14–22 AWG
Conversion 10–bit analog–to–digital conversion
Pulse Counting Up to 16 Hz
Input range 0–5 volts DC
NetSensor Compatible with models KMD–1161 and KMD–1181.
Outputs, Universal 1
Key features Output short protection
Programmable as an analog or binary object.
Standard units of measure
Connector Removable screw terminal block
Wire size 14-22 AWG
Output voltage 0–10 volts DC analog
0–12 volts DC binary output range
Output current 100 mA per output

KMC Controls
Revision E
About the BAC-7302
Specifications
4
Outputs, Single-stage triac 1
Key features Optically isolated triac output.
Programmable a binary object.
Connector Removable screw terminal block
Wire size 14-22 AWG
Output range Maximum switching 30 volts AC at 1 ampere
Outputs, Dual-stage triac 2
Key features Optically isolated triac output.
Programmable as binary object.
Connector Removable screw terminal block
Wire size 14-22 AWG
Output range Maximum switching 30 volts AC at 1 ampere
Communications
BACnet MS/TP EIA–485 operating at rates up to 76.8 kilobaud.
Automatic baud detection.
Automatically assigns MAC addresses and device
instance numbers.
Removable screw terminal block.
Wire size 14–22 AWG
NetSensor Compatible with models KMD–1161 and KMD–1181,
Connects through RJ–12 connector.
Programmable features
Control Basic 10 program areas
PID loop objects 4 loop objects
Value objects 40 analog and 40 binary
Time keeping Real time clock with power backup for 72 hours
(BAC-7302-C only)
See PIC statement for supported BACnet objects
Schedules
Schedule objects 8
Calendar objects 3
Trend objects 8 objects each of which holds 256 samples
Alarms and events
Intrinsic reporting Supported for input, output, value, accumulator,
trend and loop objects.
Notification class objects 8
Memory Programs and program parameters are stored in
nonvolatile memory.
Auto restart on power failure

BAC-7302 RTU Controller
Revision E
About the BAC-7302
Specifications
5
Application programs KMC Controls supplies the BAC-7302 with
programming sequences for roof top units:
◆Roof top operation based on occupancy, night
setback, proportional hot and chilled water valve
control.
◆ Economizer operation.
◆ Freeze protection.
Regulatory UL 916 Energy Management Equipment
FCC Class B, Part 15, Subpart B
BACnet Testing Laboratory listed
CE compliant
SASO PCP Registration KSA R-103263
Environmental limits
Operating 32 to 120° F (0 to 49° C)
Shipping –40 to 140° F (–40 to 60° C)
Humidity 0–95% relative humidity (non-condensing)
Installation
Supply voltage 24 volts AC (–15%, +20%), 50-60 Hz, 25 VA, Class 2
only, non-supervised (all circuits, including supply
voltage, are power limited circuits)
Weight 8.2 ounces (112 grams)
Case material Flame retardant green and black plastic
Models
BAC-7302C BACnet RTU controller with real-time clock
BAC-7302 BACnet RTU controller without real-time clock

KMC Controls
Revision E
About the BAC-7302
Accessories
6
Dimensions
Accessories Power transformer
XEE-6111-40 Single-hub 120 volt transformer
XEE-6112-40 Dual-hub 120 volt transformer
Table 1-1 BAC-7302 Dimensions
A B C D E
4.36 in. 6.79 in. 1.42 in. 4.00 in. 6.00 in.
111 mm 172 mm 36 mm 102 mm 152 mm
OUT4 GND T3B RTN3 T3A T2B RTN2 T2A RTN1 T1
A
E
B
C
D

BAC-7302 RTU Controller
Revision E
About the BAC-7302
Safety considerations
7
Safety
considerations KMC Controls assumes the responsibility for providing you a safe product and
safety guidelines during its use. Safety means protection to all individuals who
install, operate, and service the equipment as well as protection of the equipment
itself. To promote safety, we use hazard alert labeling in this manual. Follow the
associated guidelines to avoid hazards.
Danger
Danger represents the most severe hazard alert. Bodily harm or death will
occur if danger guidelines are not followed.
Warning
Warning represents hazards that could result in severe injury or death.
Caution
Caution indicates potential personal injury or equipment or property damage
if instructions are not followed.
Note
Notes provide additional information that is important.
Detail
Provides programing tips and shortcuts that may save time.

KMC Controls
Revision E
About the BAC-7302
Safety considerations
8

BAC-7302 RTU Controller
Revision E 9
SECTION 2
Installing the controller
This section provides a brief overview of the BAC-7302 and the
BAC-7302C Direct Digital Controllers. Review this material before
you attempt to install the controller.
Mounting Mount the controller inside of a metal enclosure. KMC Controls recommends using
a UL-approved Enclosed Energy Management Equipment Panel such as a KMC
model HCO–1034, HCO–1035 or HCO–1036. Insert #6 hardware through the four
mounting holes on the top and bottom of the controller to securely fasten it to a flat
surface. See Dimensions on page 6 for mounting hole locations and dimensions. To
maintain RF emission specifications, use either shielded connecting cables or enclose
all cables in conduit.
Connecting inputs The BAC-7302 controller has four universal inputs. Each input can be configured to
receive either analog or digital signals. By using the optional pull-up resistors, either
passive or active devices may be connected to the inputs.
Note
KMC supplied Control Basic programs assign input 1 (I1) to the space
temperature sensor input. If the KMC programs are not in used or are
modified, input 1 is available for other use. Inputs 2 and 3 are not assigned by
KMC programs and are available as needed.
Pull–up resistors
For passive input signals, such as thermistors or switch contacts, use a pull-up
resistor. For KMC thermistors and most other applications set the switch to the On
position. See Illustration 2-1 for the pull-up switch location.
Illustration 2-1 Pull-up resistors and input terminals
OUT4 GND T3B RTN3 T3A T2B RTN2 T2A RTN1 T1
1
BAC-7302 cover removed.
Off On

KMC Controls
Revision E
Installing the controller
Connecting outputs
10
4–20 mA inputs
To use a 4–20 current loop input, connect a 250 ohm resistor from an input to
ground. The resistor will convert the current input to a voltage which can be read by
the controller analog-to-digital converter. Set the pull-up switch to the Off position.
Ground terminals
Input ground terminals are located next to the input terminals. Up to two wires, size
14–22 AWG, can be clamped into each ground terminal. If more than two wires must
be joined at a common point, use an external terminal strip to accommodate the
additional wires.
Pulse inputs
Connect pulse inputs under the following conditions:
◆If the pulse input is a passive input such as switch contacts, then place the
input pull-up in the On position.
◆If the pulse is an active voltage (up to a maximum of +5 volts DC ), then place
the input pull-up jumper in the Off position.
Connecting
outputs The BAC-7302 includes one single-stage triac, two-three stage triacs and one
universal output. All triacs are rated for 24 volt, 1 ampere loads, switch on zero
crossing and are optically isolated.
Caution
When connecting loads to triacs, use only the terminal marked RTN associated
with each triac for the 24-volt ciruit.
Output 1 This output a single triac is designed to switch a 24-volt AC fan motor
starter circuit.
Output 2 Typically programmed with a PID loop object to control two-stage
heating. Triac 2A turns on when the programmed output is above 40% and turns off
below 30%. Triac 2B turns on when the programmed output is above 80% and turns
off below 70%.
Illustration 2-2 Output terminals
OUT4 GND T3B RTN3 T3A T2B RTN2 T2A RTN1 T1
OUT4 GND T3B RTN3 T3A T2B RTN2 T2A RTN1 T1
Universal
output and
ground
Triac 2a and 2b
output and
return
Triac 3a and 3b
output and
return
Triac 1
output and
return