Building Automation Knowledge Base

Issue B-tree and rebuild can not fix a problem in an access control file Environment I/NET Access Control Cause You must first use the AC file conversion utility to convert it to a MDB format. Resolution Select mdb as the target file type Open the file in Microsoft Access Delete the problem records Run the AC file conversion to reconvert it back to AC file type Run the conversion from 1.XX to 2.XX.

Issue How to make local CPH work on a stand-alone MR-VAV-AX. Environment MR-VAV-AX Cause Even after you select local-CPH in the parameters and connect a contact to the local cph point, the unit probably won't switch modes without further modification. The application is looking for a zero for one mode and something above 1 for the other. Problem is that the factory calibration of the inputs can only be done to within 1 or 2 counts. With the standard conversion coefficient of 5 and 0, you'll still see a value of 5 or 10 for a shorted input. Changing the conversion coefficient wouldn't help because you need an absolute zero. Resolution Even though this is for stand-alone use, you need to connect the unit to an MCI or ISITE Lan. You can leave the address at 0 and set address 0 to MR or ASC in the MCU configuration. Open the ASC editors and update MCI for address 0 and check the point value for local cph with that input shorted. If it doesn't read 0, proceed. Next select Edit, Controller, MR functions. Highlight 0 and hit the Hardware button. These M and Bs are here as a result of the factory calibration. Reduce the B on input 02 (3rd entry down) by one or 2 or even 3 so that the local cph input reads 0 when shorted. When your done with the first one, you can plug in the rest and use the same MCI database provided you leave them all at 0.

Issue Why do the just created lighting circuits not appear in the zones sometimes? Environment I/NET Lighting controller Cause This is a known issue. This has been fixed in later revisions of I/NET. Resolution As a work around, Exit out of the Resident I/O or Summary screen Launching either screen again. Or you can go into the Edit > Controller > Zone Definition and attach the circuits to the zones there.

Issue What are the point address to be used as lighting circuits? Environment I/NET Lighting controller Cause Only certain points can be used to control lighting circuits. These are reserved. Resolution Use points 0-7 with a bit offset of 0-7. You may also use 8-11 for indirect circuits.

Issue What are the point address to be used as lighting zones? Environment I/NET Lighting controller Cause Only certain points can be used to control lighting zones. These are reserved. Resolution Use points 12 to 15 with a bit offset of 0-7

Issue When controlling a circuit point in the summary, the relay does not fire. Environment 7780 Lighting Controller Cause  PICO Fuse on the 7780 controller may be burned out. Resolution Check the PICO Fuse on the 7780 controller. It may be burned out and need to be replaced. Also double check the Control Description.

Issue When using the Automatic Time Schedule for Lighting control should the ATS be applied to the Zone or to the point? Environment I/NET Lighting Controller Cause Lighting control design tips. Resolution Schneider Electric recommends that you always apply an Automatic Time Schedule as a wink source through the Zone not the point itself.

Issue What is the difference between Single-pushbutton, dual-pushbutton and latched in a lighting zone? Environment I/NET Seven Lighting Zone Controller Cause Programming lighting controls offers zone options for after hours override. Resolution Single-pushbutton is used when a momentary spring-loaded button is required. You push a button and a closed contact (1) is made. Releasing the button results in a open contact (0) and starts the zone. Dual-pushbutton is a two button switch. Pressing one button gives you a closed contact (1). Pressing another button results in a closed contact (0) on the second input and the zone is turned off. Latched is for when you have a light switch. Flip a switch and it stays on (1). Flip it the other way (0) and it turns off.

Issue What are the different override types on a 7780 Lighting Controller? Environment 7780 Lighting Controller Cause Different override types behave differently. Resolution Permanent means the override will continue indefinitely until: the button is pressed, the switch is moved, or the next time schedule off time happens. Timed means the override will run for a specified number of minutes (0-120).

Issue Correlate which output relays go with which resident I/O addresses in the 7780 Environment 7780 Lighting Controller Resident I/O Editor Cause Wiring diagrams and software designations need to line up for proper lighting control. Resolution On the 7780 the first matrix card controls the bottom eight on each side of the controller giving you your first 16 relays. The bottom front relay on the right side is your first relay. The relay directly behind it is the second relay. This continues up the right side of the controller till you reach the eighth relay, then the numbering jumps to the front bottom left relay and continues with relay number nine. The first relay will be circuit 0000. The second relay will be 0001 and so on. Till you reach 0007. Relay nine will be 0100, ten will be 0101, etc..

Issue What are the differences between DPU EPROM rev 2.21 and 2.22? Environment DPU EPROM Cause On the 2.22 rev, one problem was corrected and an enhancement included. Resolution The problem was when using first key auto-unlock, the software would show the door as unlocked, when the first valid read had not yet unlocked it. It now remains in the secure mode in software until the first valid read. The enhancement is that when a DPU is operating on back up battery power, the power led will now flicker to indicate the change from commercial power.

Issue How do I get the latest version of I/Net? Product Line TAC INET Environment Site or campus wanting I/NET or upgrade of existing Cause Wanting latest or upgrade of I/NET Resolution If you wish to obtain this revision of software, please contact your Business Development Manager or qualified sales order channel. Each region or country has their representative.

Issue What effects do processor loading have on controller communications and operation? Environment I/NET controllers Cause Knowing the potential consequences of overloading the processor will help with network design and controller selection. Resolution If the processor hits 100% during the time that controller receives the token on the LAN, the controller will ignore the LAN in favor of continued operation of the equipment connected to it. If the processor gets overloaded with too many tasks to perform at once, it will buffer the commands to executed. Therefore, the worst that should happen is that an event or calculation will be performed late or delayed but everything should still happen in the intended sequence order. 

Issue An analog input reads the wrong value. Is it the controller or the sensor? Product Line TAC INET Environment Analog inputs on I/NET controllers Cause Determining where the problem originates - a failed sensor or a bad input - will help arrive at a solution faster. Resolution Open the conversion coefficient calculator Set the high and low values for counts and units to configure the input to show raw voltage input.  Let it enter that result into an open entry in the CC table. On a 7716/7718/7728 or 7756 upper board: Enter 0 for counts low and 4095 for counts high, 0 for units low and 5 for units high On the lower board of the 7756: Enter 0 for counts low and 65535 for counts high, 0 for units low and 10 for units high.  On an MR-88 or 632: Enter 0 for counts low and 255 for counts high On an MR-55 or an ASC: Enter 0 for counts low and 255 for counts high, units low 1.5 and units high 4. If this is a DPU, DIO or DIU, this does not apply to this situation. Select that conversion coefficient for the input in question and make sure there is no look up table for it. The input will now show the measured voltage for that input. Read that voltage on the actual input with a meter and compare to the reading on the screen, viewcon or HHC. If the readings match, the problem is the sensor, your conversion coefficient, or your look up table. If not, the problem is in the controller. Refer to other articles about possible configuration problems on inputs.

Issue What is a Smoke Control System supposed to do? (TCON 231, Designing a Smoke Control System) Environment Smoke Control System Buildings Management System Cause In the event of a fire, the most immediate danger is most often the smoke. Building controls can play a big part in a fire safety system by manipulating building pressures to control the migration of smoke and give inhabitants valuable extra time to escape. Resolution A Smoke Control System should meet one or more of the following Objectives: Maintain a tenable environment along the evacuation routes Control and reduce the migration of smoke from the fire zone into other areas Reduce deaths and injuries from smoke Reduce property loss from smoke damage Aid the effort of fire-fighters

Issue Only one of the readers on a 7920 DPU works Environment 7920 DPU Cause If you have defined one door in the DPU 7920, and the door’s Exit Reader parameter is set to anything other than "NO," then the second reader port automatically becomes the exit reader. Resolution If you have defined two doors in a DPU 7920, neither door can have an Exit Reader defined.

Issue Do I need a Handheld Console (HHC) to set up a 7798 (SLI) (ISITE)? Environment 7798 SLI ISITE Cause The 7798 does not have ports for a HHC. Resolution No. In fact, the 7798 does not have ports for a HHC. The 7798 is setup using its touch pad. Refer to 7798 TCONs for more details.

Issue What HHC cable do I need to connect to a Unitary Controller (UC) SubLAN port? Environment I/NET Hand Held Console (HHC) Cause Can not locate documentation to indicate which cable is required. Resolution The part number is 606014-0011. It is a six foot (or 1.8 m) coiled, black modular cable. Refer to TCON 073 for more details. HHC or Hand Held Controller is also called the HC7410 Note for iPortal users:  The above Part Number in iPortal is displayed in the Description / Part Name .  iPortal uses the following part number for this product: 01-0100-492-01

Issue What HHC cable do I need to connect to a LTS80U Space Sensor Assemblies (maintenance) port? Environment LTS80U Space Sensor Assembly Hand Held Console Cause Connecting the HHC allows for configuration. Resolution The part number is 602135-0002. It is a two foot (or 60 cm) straight, silver modular cable; Console-3. Refer to TCON 073 for more details.

Issue Can I change the address of a UC? Environment HHC UCI 7410 HC7410 Cause Setting the address of a UC is part of the initial setup. Resolution Plug the hand-held console into the LAN A or LAN B Communications port of a unitary controller. A black coiled cord six feet in length is used to make the connection (P/N 606014-0001; tagged: Console-1). You must sever (unplug) communications between the UCI and UC before plugging the HC7410 at this location. One end of the cord is plugged into the port on the HC7410 while the other end is plugged into the appropriate port of the individual UC. Press [DCU ADDR]. The HC7410 displays the address in positions five and six. Enter a replacement address. The address displays in positions five and six. Press [ENTER]. The HC7410 displays UC. Refer to TCON 073 or TCON 069 (UC Installation) for more details.