Section 5 - Troubleshooting; Testing The Electronic Unit - Ametek Drexelbrook Z-tron Level Control 502-302X Series Installation And Operating Instructions Manual

502-302 Series Z-tron Level Control
X
SECTION 5
TROUBLESHOOTING
5.1 Testing the
Electronic Unit
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The Z-tron Level Control is a solid-state device with no
moving parts other than its relays, and requires no main-
tenance or adjustments. The units are designed to give
years of unattended service.
A spare electronic chassis is recommended for every 10
units so that, in case of a failed unit, a critical application
will not be held up while the unit is returned to the factory
for repair.
Use the following troubleshooting procedures to check out
the Z-tron Level Control. If attempts to locate the difficulty
fail, notify your local Drexelbrook representative, or call
the Factory Technical Service direct at 1-800-527-6297.
You must be able to find a tune point with no sensing
element hooked to the electronic unit.
Use the following steps to check out the electronic unit:
If the electronic unit has time delay, turn the delay pot to
its full counterclockwise position (minimum delay).
If the electronic unit has a pad capacitor soldered to the
two test points, remove one side of the pad capacitor. See
Figure 4-6. (The following checkout procedure will not
work if a pad capacitor is in place.)
Z-tron Level Control
20
Troubleshooting
Figure 5-1