Frequently Asked Question

If you are reporting that the MT-series (2-wire) door panel is no longer communicating with the unit monitors, we can give you some troubleshooting directions that will narrow the issue down to the source and perhaps have this all sorted out and fix.

1. First, the main thing to do now is to record the voltage reading of your power supply (MT-PS). Expect to read at least 24vDC on the output.
2. Then, record the voltage reading at the MT-202 on both:
   1. Door station BUS [Expect to read at least 24vDC on the output.]
   2. Monitor BUS [Expect to read at least 24vDC on the output.]
3. Then, record the voltage reading at the MT-2-4 on all pair of branches:
   1. A [Expect to read at least 24vDC on the output.]
   2. B [Expect to read at least 24vDC on the output.]
   3. C [Expect to read at least 24vDC on the output.]
   4. D [Expect to read at least 24vDC on the output.]
4. Continue to record the voltage reading at the monitors if this is possible. Otherwise, move to the next Branch Controller (MT-2-4):
   1. A [Expect to read at least 24vDC on the output.]
   2. A [Expect to read at least 24vDC on the output.]
5. Now, at the last monitor (being the furthest in line), record the voltage reading [Expect to read at least 24vDC on the output.]

The point of reading the voltage and to expect 24vDC minimal is key. If there is a recording of less than 24vDC then the voltage reading you will need to make adjustments. The system will fail to operate properly if there is less than 24vDC.

For instance, if your monitor in unit #6 records 22vDC, this means that you will need to increase the voltage output from 24vDC + 2vDC to compensate the voltage drop recorded at the monitor. This means the MT-PS will have to read 26vDC~ to regulate the entire circuit.

Based on your reading, I will be able to assess what needs to be done. At beast, adjusting your voltage reading at the power supply will fix the issue, at lease, we may find out where on the circuit you may have a failed part.

If everyone is experiencing the same issue, the area to focus will be the power supply, the power separator (MT-202) and the door station.

To help in the troubleshooting, I enclosed a wiring diagram for guidance.