Eltako – The System in the Building – Operating manual for Series 14 RS485 bus DIN rail mounted devices
12
Troubleshooting bus faults
General bus faults:
- Voltage reset, switch the power supply of the FAM14 or FTS14KS off briefly and then back on.
- There may be a contact problem on the bus jumpers. Check the bus using a tester. (See Figs 1 and 2)
- To do this, disconnect the bus centrally and measure in both directions to locate the fault faster.
- Reduce the bus system into smaller bus groups to locate the fault even further.
- If required, measure the bus connection inside the devices to detect a cold solder joint or a short circuit. (See Figs 3 and 4).
- Check the levels and measured values. (See Fig 5)
- All HOLD terminals must be connected together.
- If there are several sub-distributions, all bus sections must be connected to the GND potential (-12V) of the FAM14!
- Ideally, use the HOLD and GND conductors from a twisted conductor pair.
The FAM14 does not flash when a wireless signal is sent:
- Check the power supply 230V and bus voltage 12V DC.
- Check whether the antenna is connected.
- Check whether the upper rotary switch is pointing to one of the positions between 2 and 8.
An actuator cannot be taught in; the flashing LED does not go out:
- No connection is allowed to be made with PCT14. The LED on the FAM14 may not light up green. If necessary, carry out a
bus reset.
- Check whether a rotary switch was turned to LRA instead of LRN during teach-in.
- Check whether the signals are processed via FAM14, FTS14EM, FGW14 or FTS14TG. An LED must flash on the appropriate
device when the pushbutton is pressed.
The actuators do not react to signals from FSU14 or FMSR14:
- The BA rotary switch on the FAM14 is not pointing to 2, 3 or 4.
- No device address was assigned yet.
- The wrong operating mode was selected. On the FSU14 switch the channel operating mode to automatic or central on/off.
On the FMSR14 do not select the operating mode 'OFF'.
The connected PCT14 software signals an exception error:
- See also general bus faults.
- Switch off and switch on the connection to the FAM14 or FTS14KS.
- A device address was assigned twice. Delete and try again.
- Remove all jumpers to the actuators using the jumper installation tool SMW14. Set up a connection to the PCT14 and ex-
tend the bus system by one actuator at a time while assigning device address with the PCT14 software; this cancels any
double address assignment.
6. Troubleshooting bus faults
