Walchem WDB400 Series, Инструкция по эксплуатации

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With power removed, remove the terminal block that has the black (hot) wires from all of the pigtails
(TB2). This simply pulls up off some metal pins. Check these pins for corrosion. If they seem coated with
anything, scrape off the coating by replacing and removing the terminal block several times. Restore
power and manually activate the relay.
With power removed, remove the TB2 terminal block again, and attach one lead of a multimeter to the pin
that lines up with the wire for the relay in question, and the other lead on the other side of the relay (this
will be an adjacent pin for a dry contact relay, or neutral at TB3 for a powered relay). Set the meter to read
resistance. Restore power and verify that the meter reads infinite ohms with the relay off (open) and very
low ohms with the relay on (closed). If it always reads infinite ohms, the controller is faulty.
7.5 No Display
Verify that the controller has power. Check F1 fuse.
If a 4-20 mA output option board has been installed, make sure that it is not installed crooked (off by one
pin on the connector).
Make sure that the ribbon cable has not been removed and re-installed backwards. See Figure 4.
8.0 SERVICE POLICY
The WDB series Boiler Conductivity Controller has a 2-year warranty on electronic components and a 1-
year warranty on mechanical parts (keypad, terminal strip and relays).
We stock circuit boards for immediate exchange after we have isolated the cause of the problem.
Factory authorized repairs that are received by next-day-air will be returned within 24 hours. Normal
priority for returns is two weeks.
Out of warranty repairs or circuit board exchanges are done on a flat fee basis after the warranty is
expired.
WALCHEM CORPORATION
5 BOYNTON ROAD HOPPING BROOK PARK HOLLISTON, MA 01746 USA