KMC Controls BAC-7401, Installation And Operation Manual

Page 1: ...ecting 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 57E Revision E ...

Page 2: ... 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 liab...

Page 3: ...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 Ove...

Page 4: ...ement 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...

Page 5: ...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 ...

Page 6: ... 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 instruct...

Page 7: ...necting 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...

Page 8: ...int 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 ou...

Page 9: ...r 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 A terminal in parallel with all other terminals Connect the B terminal in parallel with all other terminals Connect th...

Page 10: ...ed 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...

Page 11: ...from the transformer does not exceed its rating and phasing is correct If several controllers are mounted in the same cabinet you can share a transformer between them provided the transformer does not exceed 100 VA or other regulatory requirements Do not run 24 volt AC power from within an enclosure to external controllers Connect the 24 volt AC power supply to the power terminal block on the lowe...

Page 12: ...n the KMC Controls web site BACstage User s Guide to Installation and Getting Started 902 019 62 BAC 5000 Reference Guide 902019 63 TotalControl Reference Guide Application Note AN0404A Planning BACnet Networks MS TP Automatic MAC Addressing Installation Instructions Supplied applications programming Refer to the KMC Digital Applications Manual for information on using the applications programs in...

Page 13: ...tions are described in the guide MS TP Automatic MAC Addressing Installation Instructions that is available from the KMC Controls web site Network disconnect switch The network disconnect switch is located on the left side of the controller Use this switch to enable or disable the MS TP network connection When the switch is ON the controller can communicate on the network when it is OFF the contro...

Page 14: ...estart operation is complete Restart button operations are listed in the following table Communications Com LED The yellow Communications LED indicates how the controller is communicating with other controllers on the network Sole master Repeating pattern of a long flash and a short pause that repeats once a second It indicates that the controller has either generated the token or is a sole MS TP ...

Page 15: ...he voltage or current on the network exceeds safe levels the bulbs operate as fuses and may protect the controller from damage Isolation bulbs The two network isolation bulbs KMC P N HPO 0054 located next to the network switch serve three functions Removing the bulbs opens the EIA 485 circuit and isolates the controller from the network If one or both bulbs are lit it indicates the network is impr...

Page 16: ...red will have no effect on the controller Performing a warm start A warm start changes the controller as follows Restarts the controller s Control Basic programs Leaves object values configuration and programming intact Caution In the unlikely event that the checksum test in RAM fails during the warm start the controller will automatically perform a cold start During a cold start controller output...

Page 17: ...a cold start with BACstage or from TotalControl Design Studio Restoring to factory settings Restoring a controller to factory settings changes the controller as follows Removes all programming Removes all configuration settings Restores the controller to factory default settings Caution Resetting the controller erases all configuration and programming After resetting to factory settings you must c...

Page 18: ...KMC Controls Revision E Operating the controller Restoring factory settings 18 ...