Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA _______________________________________________________________________ 99
PWD22/52 Electrical Troubleshooting
PWD22/52 is protected against reverse polarity connected to power feed
wires. If the power feed is connected to other leads than those for power
supply, damage may occur depending on feed voltage and current
limiting features of the supply.
If there is no response from PWD22/52:
1. Check the connections. PWD22/52 diagnosis can be done through
the RS-232 maintenance line.
2. Check the baud rates:
- The factory default is 9600,7,E,1.
3. Open the cover of the receiver.
4. Connect the power and watch the internal LEDs.
Initialization sequence (3 seconds):
LED 4 RED lit (Signal lit / offset off)
LED 3 YEL lit (RUN, 1 Hz)
LED 2 RED off (Transmit Data)
LED 1 YEL off (Receive Data)
Start sequence (1 second):
LED 4 RED lit (Signal lit / offset off)
LED 3 YEL off (RUN, 1 Hz)
LED 2 RED off (Transmit Data)
LED 1 YEL off (Receive Data)
Running sequence from start:
LED 4 RED lit 10s / off 5s, continuing sequence
LED 3 YEL flashing, 1 Hz
LED 2 RED short live when sending initialization string (Transmit
Data)
LED 1 YEL off (Receive Data)
5. If the sequence is working and the transmit indicator gives
response, check following:
- Initialization string "VAISALA PWDxx Vn.nn yyyy-mm-dd
SN:___" should give a response to the maintenance terminal, if
the response is not understandable:
- Check the terminal communication set-up.
- Try with other expected baud rates.
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