Model H1301 Recovery and Recycling System
Installation, Operation and Maintenance Manual
Revision-L September, 2019
Page 102 of 105
VIII. Trouble Shooting Guide (continued)
L. Process Tank Liquid Level Switch Trouble Shooting
The AGENT liquid level inside the process tank is monitored by a three-station magnetic
float switch. A 24VDC signal is sent by the system PLC to the Common Lead (black wire)
of the switch. As the liquid raises the floats of the switch, a magnetic sensor connects the
24VDC to the appropriate switch output lead wire: Low Level (Red Wire), Mid-Level
(Yellow Wire), and High Level (Blue Wire). The switch may be tested by first
disconnecting the lead wires from the PLC inputs. Continuity from the Black wire to the
various position lead wires will indicate a liquid level indication and no continuity will
indicate no liquid present at that level. A dielectric breakdown tester may be used to verify
switch integrity by connecting all four of the switch leads to one of the tester probes and
the other test probe to the metal hex fitting of the switch.
NOTE: The liquid level switch connection wiring can be identified using the enclosed
machine wiring diagram and section-VI.A: PLC Status Indicators.
NOTE: The process tank will require complete removal of AGENT before a liquid
level switch is replaced and final evacuation after switch replacement. Use section-
Vll.K: Complete System Evacuation as a guide.
1.Liquid Level Indicators stick to the ON or OFF positions when the machine is cold
but not when the machine is at room temperature.
a. The level switch is contaminated with water. Perform section-VII.K: Complete
System Evacuation.
2.Liquid Level Indicators remain OFF regardless of the machine temperature.
a. Liquid Level Switch L2 is defective. Test and if required replace with part number
A6-06-0000-00-2.
b. Level switch wiring to the PLC Inputs is not intact. Ohm-out and correct wiring.
c. PLC level switch input indicator number illuminates but the PLC output number
does not illuminate within 1-minute. The PLC is malfunctioning consult the factory.
d. PLC output fuse is blown. The fuse is located just below the PLC. Examine the
fuse and replace as required with same rated fuse.
e. Wiring from the PLC outputs to the Front panel level indicator lamps is not intact:
verify wiring integrity, and repair as required.
f. Front panel level indicator lamps are burnt out. Test lamps with 90 to 130 VAC and
replace as required.
3.Liquid Level Indicators remain ON regardless of the machine temperature.
a. Liquid Level Switch L2 is defective. Test and if required replace with part number
A6-06-0000-00-2.
b. The PLC is malfunctioning consult the factory.
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