Johnson Controls Unitary Products YCCS TEC2603-4 BACnet, Руководство по установке

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676292-YIM-A-0111
YCCS TEC2603-4 BACnet® MS/TP Networked Multi-Stage Thermostat Controllers Installation Instructions 14
• Check bus voltages:
- (+) to COM must be within 2.0 to 3.0 VDC
- (-) to COM must be within 1.5 to 2.54 VDC
- (+) to (-) must be within 0.3 to 1.0 VDC
Note: Values may fluctuate due to ongoing
communications. This operation is normal provided
the voltage is within the defined range.
• Check addresses:
- Check for duplicate addresses.
- Verify the address range is sequential.
Correcting Thermostat Controller Problems
The TEC2603-4 Thermostat Controller may also have
problems specific to the device. Use Table 4 and
Table 5 as additional troubleshooting resources.
Table 4: Alarm Messages
Display Function
Frost Indicates that the heating is energized by the low limit frost protection room temperature setpoint 5.6°C (42°F).
Fan Lock Indicates that the heating and cooling action are locked out due to a defective fan operation.
Filter
1 Indicates that the filter(s) is dirty in accordance with the Digital Input.
1. This alarm also appears at the System Manager.
Table 5: Additional Thermostat Controller Troubleshooting Details
1
Symptom Probable Causes
Multiple
Symptoms The baud rate may have been changed on some devices on the network but not all devices.
A download may be in progress.
There may be a fault at a device.
A repeater may be needed or may be configured incorrectly.
There may be a duplicate device object name or instance.
Poor Performance Excessive bus traffic may exist (bus overload).
The baud rate may be set too low.
There may be too many devices on the network.
There may be unaccounted devices on the network.
There may be unusually slow devices on the network or devices that are slow to respond.
Thermostat
Controller Goes
Offline A power failure or other failure may have occurred at the thermostat.
Communication may have been disabled at the thermostat controller.
Thermostat
Controller Does
Not Come Online A thermostat controller may be connected to the wrong bus.
A baud rate may be specified in the new thermostat controller that is incompatible with the running
network.
No device on the network is configured to use a specific baud rate, but all devices are set to use auto
baud. At least one device must have an assigned baud rate. Set the baud rate in the bus supervisor
and set all other devices to auto baud.
1. For common MS/TP troubleshooting information, refer to the MS/TP Communications Bus Technical Bulletin
(LIT-12011034).