Technical Support - Vaisala PWD22 User Manual

User's Guide _______________________________________________________________________

Technical Support

104___________________________________________________________________ M210543EN-B
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 PWD22 Vn.nn yyyy-mm-dd
SN:___ " should give some response to maintenance
terminal, if the response is not understandable:
- Check the communication set-up of terminal.
- Try with other expected baud rates.
6. If the LEDs are not lit, check the internal connector connections
of PWD22. The following measurement can be done:
- Measure the input voltage:
X1-5 = power GND, X1-4 = power + V
7. If the LEDs are lit but the sequence starts again and again, try
the following:
- Check the cable end for short-circuit with neighboring leads.
Unused wires of the PWD22 mast cable must be insulated
from each other, for example, by connecting them to void
screw terminals in the junction box.
- Try with a power with a higher current supply capability (the
power supply may go to current limiting state for a short
while).
- Try with a higher supply voltage (max. 55 VDC.) This helps
the starting current need.
For technical questions, contact the Vaisala technical support:
E-mail helpdesk@vaisala.com
Phone (int.) +358 9 8949 2789
Fax +358 9 8949 2790