Vogt VT100, Руководство по обслуживанию

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Vogt
®
VT Service Manual 8-5
Service Operations
PLC (Programmable Logic Controller).
The VT-Series ice machine is controlled by a PLC
(Programmable Logic Controller). The PLC controls the sequence of events and monitors the ice machine
functions. The operational sequences of the VT-Series ice machine can be described best as a series of six
different modes. Each mode identifies and defines a sequence of events that occur while in that mode and
thereby cause it to move to the next mode. Only one mode is active at a time.
FIGURE 8-5
PLC (Programmable Logic Controller)
# Description # Description
Inputs 0 Current Sensing Relay (chopper)
Outputs
0 Fault Indicator light
1 “On” Selector Switch/Bin Control 1 Liquid Feed Solenoid (R404A machines only)
2 HH Pressure Switch 2 Compressor
3 Manual Harvest (Start) Button 3 N/A
4 Clean Switch 4 Water Pump
5 High Pressure Safety Switch 5 Chopper/Hot Gas Valve/Defrost Loop valve or
6 Low Pressure Safety Switch
Suction Stop Valve (VT80 & VT100)
7 Oil Press Safety /Comp Motor OL
TABLE 8-1
PLC Inputs/Outputs
Freeze cycle Timer (PLC analog pot)
Turn Clockwise to increase freeze time
Minimum Freeze Time = 5 min
Maximum Freeze Time = 8.5 min