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Fault finding
DyNet bus issues
After completing the power up tests, all controllers should react to a single button push message. If not, check for
any discrepancies between the installation and the installation instructions and check troubleshooting symptoms.
To rectify problems, follow these five steps:
1.
Analyze the symptoms.
2.
Diagnose the cause.
3.
Repair the problem.
4.
Verify the solution.
5.
Prevent the issue occurring again.
Electrical characteristics
If faults are occurring, one of the first things to check is the typical RS-485 DyNet voltages. Incorrect voltages may
indicate short/open/crossed circuit or the need for an additional power supply.
Electrical Property
Correct Min – Max
network supply voltages:
Typical Data voltages
with reference to Gnd:
Max DyNet network
supply/load current
Important: Mains fed load controllers and power supplies contribute power to the network.
B
Gateways, button panels, dry contacts and sensors consume power from the network.
Unresponsive devices
If the controls are not responding as expected, follow the procedure below to isolate the fault. If you are still
unable to rectify the fault, make a list of device model numbers used in the system and contact technical support,
via the Signify Partner Portal.
Isolate a fault in the network:
1.
Find the midway point of the spur.
2.
Break the network into two halves at a field device (user interface or sensor) and power both halves.
3.
Perform power-up tests (refer to page 11) in each half of the network; this will identify which half has the
problem.
4.
Continue to break the half into quarters etc. Repeat power-up tests until you have found the fault.
16
th
February 2022
Values
European (EU): 12 to 18 V (nominal 15 VDC) between Gnd and +V terminals
North American (NA): 20 V to 26 V (nominal 24 VDC) between Gnd and +V terminals
D- between 0.2 VDC to 1.0 VDC
D+ between 0.5 VDC to 3.8 VDC
D- to D+ must be greater than 300 mV during transmission
2 Amps
Dynalite Hardware
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Installation Guide
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Page 18
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www.lighting.philips.com/dynalite
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