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502-3000 Series Ztron
SECTION 5
TROUBLESHOOTING
5.1 Introduction
5.2 Testing the
Electronic Unit
TM
Point Level Control
The Ztron Level Control is a solid-state device with no moving
parts other than its relays, and requires no maintenance or
adjustments. The units are designed to give years of unat-
tended 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
delayed while the unit is returned to the factory for repair.
Use the following troubleshooting procedures to check out the
Ztron Level Control. If attempts to locate the difficulty fail,
notify your local Drexelbrook representative, or call the fac-
tory direct at 1-800-527-6297 (US and Canada) or
1-215-674-1234 (International).
Use the following procedure to troubleshoot the Ztron elec-
tronic unit:
a.
See Figure 5-1. Disconnect the sensing element wires
from the instrument by removing the blue wire from the
center terminal and the orange (or red) wire from the
shield terminal. Leave the power connected.
b.
Starting with the setpoint adjustment in the extreme
counterclockwise (CCW) position, turn the screwdriver
clockwise (CW) until the relay just operates.
c.
Rotate the setpoint adjustment back and forth about this
point, observing the travel of the screwdriver between
the relay pull-in and relay drop-out. If the instrument is
working properly, the screwdriver should travel less
than ¼ turn to operate the relay.
27
Troubleshooting
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