Graco Therm-O-Flow 20 [25/108] Connect plc

Graco Therm-O-Flow 20 [25/108] Connect plc
Setup
Connect Connect
Connect
PLC PLC
PLC
APLCcancontrolandmonitorallitems
shownintheCustomerDigitalInputsand
OutputsshownontheDiagnosticsscreen.See
AppendixA—ADM,page92.
WhenthePLChascontrolofthesystem:
FunctionalityisrestrictedfromtheADM
Automaticcrossoverisdisabled.RelyonthePLC
andmachinestateindicatorstoknowwhento
crossoverusingtheI/O.
Table Table
Table
5 5
5
Customer Customer
Customer
Input Input
Input
Signal Signal
Signal
No. No.
No.
Unit Unit
Unit
A A
A
Description Description
Description
1
HeatOnRequest
TurnontheHeat
2
SetbackRequest
PuttheUnitin
Setback
3
PumpOnRequest
TurnonthePump
4
PLCControlRequest
(inputappliesto
primarytounitA
only)
Controltheprimary
andsecondaryTOF
systemsfromthe
PLCinsteadofthe
ADM
Table Table
Table
6 6
6
Customer Customer
Customer
Output Output
Output
Signal Signal
Signal
No. No.
No.
Unit Unit
Unit
A A
A
or or
or
B B
B
Description Description
Description
1
RunStateBitLowSeeRunStateChart
2
RunStateBitHighSeeRunStateChart
3
ErrorStateBitLowSeeErrorState
Chart
4
ErrorStateBitHighSeeErrorState
Chart
Table Table
Table
7 7
7
Output Output
Output
Error Error
Error
States States
States
Error Error
Error
State State
State
Bit Bit
Bit
High High
High
Error Error
Error
State State
State
Bit Bit
Bit
Low Low
Low
00Machineis
good,noerrors
arepresent
01ActiveUnit
DrumLow
10ActiveUnit
DrumEmpty
11AlarmPresent
inSystem
Table Table
Table
8 8
8
Output Output
Output
Run Run
Run
States States
States
Run Run
Run
State State
State
Bit Bit
Bit
High High
High
Run Run
Run
State State
State
Bit Bit
Bit
Low Low
Low
00
PumpOff/Heat
Off
01
PumpOff/Heat
On
10
PumpOff/Heat
AtTemp
11
PumpOn/Heat
AtTemp
Note
Alloutputsarenormallyopenwhenpoweris
OFF.Forerror(alarm)output,thecontacts
closewhenanalarmoccurs.Forallothers,
contactsclose.
Note
TheTOFsystemshipswithtwoscrew
terminalconnectorsthatplugintoMZLP
connectorsH1andH2.Connectorsare
locatedinabagontheinsideoftheelectrical
enclosure.Toreplacetheconnectors,order
kit24P176.
1.Turnmainpowerswitchoff.
2.Opentheelectricalenclosuredoor.
3.RouteI/Ocablesthroughstrainrelief.
4.RemovepowerfromthePLC.
5.ConnectthePLCtoconnectorsH1andH2.
Note
Eachconnectorhasfoursignals.The
MZLPboardspeciestheinputrangefor
eachsignal.Seethefollowingtablefor
pinassignments.
334129D25

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