KMC Controls BAC-7401 Istruzioni operative

Section 1

About the BAC-7401

Specifications ...........................................................................................................................3

Accessories ..............................................................................................................................5

Safety considerations .............................................................................................................6

Section 2

Installing the controller

Mounting .................................................................................................................................7

Connecting inputs ..................................................................................................................7

Connecting outputs ................................................................................................................8

Connecting to a NetSensor ....................................................................................................9

Connecting to an MS/TP network .......................................................................................9

Connecting power ................................................................................................................11

Programming ........................................................................................................................12

Section 3

Operating the controller

Operation ...............................................................................................................................13

Controls and Indicators .......................................................................................................13

Restoring factory settings ....................................................................................................16

Installation and Operation Guide

BAC-7401 and BAC-7401C

Advanced Applications Controller

for Heat Pump Applications

905-019-57ERevision E

KMC Controls

Revision E2

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.

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: 1.574.831.5250

FAX: 1.574.831.5252

E-mail: [email protected]

BAC-7401 Heat Pump Controller

Revision E 3

SECTION 1

About the BAC-7401

This section provides a general description of the KMC Controls

BAC-7401 controller. It also introduces safety information. Review

this material before installing or operating the controller.

The BAC-7401 is a native BACnet, fully programmable controller designed to

control heat pump 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-7401 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 direct connection to 24-volt control circuits

◆Supplied with programming sequences for heat pump units

◆Easy to install, simple to configure, and intuitive to program

◆Controls heat pump compressor, fan, reversing valve and auxiliary heat.

Specifications Inputs

Universal inputs 4

Key features Software selectable as analog, accumulator or binary

objects.

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.

Triac outputs 4

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

KMC Controls

Revision E

About the BAC-7401

Specifications

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-7401-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

Application programs KMC Controls supplies the BAC-7401 with

programming sequences for heat pump 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

BAC-7401 Heat Pump Controller

Revision E

About the BAC-7401

Accessories

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 black plastic

Models

BAC-7401C BACnet RTU controller with real-time clock

BAC-7401 BACnet RTU controller without real-time clock

Dimensions

Accessories Power transformer

XEE-6111-40 Single-hub 120 volt transformer

XEE-6112-40 Dual-hub 120 volt transformer

Table 1-1 BAC-7401 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

T4 RTN T3 T2 RTN T1

KMC Controls

Revision E

About the BAC-7401

Safety considerations

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.

BAC-7401 Heat Pump Controller

Revision E 7

SECTION 2

Installing the controller

This section provides a brief overview of the BAC-7401 and the

BAC-7401C BACnet heat pump controllers. Review this material

before you begin installing 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 5 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-7401 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 use or are modified,

input 1 is available for other use. Inputs 2, 3 and 4 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

T4 RTN T3 T2 RTN T1

BAC-7401 cover removed.

Off On

KMC Controls

Revision E

Installing the controller

Connecting outputs

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-7401 outputs are single-stage triacs designed to directly switch 24-volt ac

circuits.

Caution

When connecting loads to triacs, use only the terminal marked RTN associated

with each triac for the 24-volt ciruit.

Illustration 2-2 Output terminals

T4 RTN T3 T2 RTN T1

Triac 3 and 4

output and

return

Triac 1 and 2

output and

return

BAC-7401 Heat Pump Controller

Revision E

Installing the controller

Connecting to a NetSensor

Connecting to a

NetSensor The Network RJ–12 connector provides a connection port to a NetSensor model

KMD-1161 or KMD-1181. Link the controller to a NetSensor with a KMC Controls

approved cable up to 75 feet long. See the installation guide supplied with the

NetSensor for complete NetSensor installation instructions.

Connecting to an

MS/TP network Connections and wiring

Use the following principles when connecting a controller to an MS/TP network:

◆Connect no more than 128 addressable BACnet devices to one MS/TP network.

The devices can be any mix of controllers or routers.

◆To prevent network traffic bottlenecks, limit the MS/TP network size to 60

controllers.

◆Use 18 gauge, twisted pair, shielded cable with capacitance of no more than

50 picofarads per foot for all network wiring. Belden cable model #82760 meets

the cable requirements.

◆Connect the -Aterminal in parallel with all other - terminals.

◆Connect the +Bterminal in parallel with all other + terminals.

◆Connect the shields of the cable together at each controller. For KMC BACnet

controllers use the Sterminal.

◆Connect the shield to an earth ground at one end only.

◆Use a KMD–5575 repeater between every 32 MS/TP devices or if the cable

length will exceed 4000 feet (1220 meters). Use no more than seven repeaters

per MS/TP network.

◆Place a KMD–5567 surge surpressor in the cable where it exits a building.

Illustration 2-3 Connection to a NetSensor

T4 RTN T3 T2 RTN T1

75 feet Max.

KMC Controls

Revision E

Installing the controller

Connecting to an MS/TP network

See Application Note AN0404A, Planning BACnet Networks for addional information

about installing controllers.

Note

The BAC-7401 EIA–485 terminals are labeled -A, +B and S. The Sterminal is

provided as a connecting point for the shield. The terminal is not connected to

the ground of the controller. When connecting to controllers from other

manufacturers, verify the shield connection is not connected to ground.

End of line termination switches

The controllers on the physical ends of the EIA-485 wiring segment must have end-

of-line termination installed for proper network operation. Set the end-of-line

termination to On using the EOL switches.

Illustration 2-4 MS/TP network wiring

-A

Illustration 2-5 End of line termination

Set end-of-line termination to

On in these controllers only.

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