Vertex VT4826+ Instruction Manual Download Page 9 | Manualshive

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Vertex VT4826+ Instruction Manual Download Page 9

9

ALARM MODE

A1MD/A2MD

DESCRIPTION

Normal alarm mode/ When timer function is selected, PV<SV timer
function is not available.

Standby mode When selected, in any alarm function, prevents an alarm
on power on. The alarm is enabled only when the process value reach
alarm set point. Also known as “Startup inhibit” and is useful for avoiding
alarm trips during startup.

Latch mode. When selected, the alarm output and indicator latch as the
alarm occurs. The alarm output and indicator will be energized even if the
alarm condition has been cleared unless the power is shut off.
When Timer function is selected, PV< SV timer function is available.

Standby and latch mode

AUTOMATIC AND MANUAL OUTPUT CONTROL

Automatic control is the normal mode of controller operation. In automatic control mode
the controller automatically adjust the control output percentage by PID algorithm so that
the PV=SV. The PID parameter Pb, Ti and Td can be also calculated by Auto Tune

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Summary of Contents for VT4826+

Page 1: ...ut failures taking place There are other options you can choose including retransmission of either the PV or SV or RS485 communications Features T C RTD selectable from front panel or as optional extra Linear Input Heating output Relay SSR or analog to be chosen when ordering Fuzzy enhanced PID Control Auto Manual Bumpless Transfer Two alarm outputs Standby and Latch mode can be combined with 8 di...

Page 2: ... 3 AT Auto tuning LED 4 MA Manual mode LED 5 A1 Alarm 1 LED 6 A2 Alarm 2 LED 7 C1 Control 1 LED 8 C2 Control 2 LED 1 SET KEY Press once to access the next programmable parameter Press this key for 5 seconds to reset alarm timer 2 UP KEY Press to increase the set point or parameter value 3 DOWN KEY Press to decrease the set point or parameter value 4 SHIFT KEY Press the shift key for 5 seconds to e...

Page 3: ...noise induction keep input signal wire away from instrument power line load lines and power lines of other electric equipment Connections Explained These are typical input connection drawing intended to explain the schematic symbols Now let s look at the detail included here RTD Input looks like this Thermocouple input like this mA or mV looks like this Model A B C D E a b c d VT 4826 48 48 6 100 ...

Page 4: ... Prog Level 5 th Prog Level SET 5sec 5sec 1 When 2nd Output Cooling is not selected CPb Cti Ctd HYS2 and db parameters are not available 2 When Pb 0 0 HYS1 will be skipped 3 When CPb 0 0 HYS2 will be skipped 4 When Pb 0 0 ti td will be skipped 5 When CPb 0 0 Cti Ctd will be skipped ...

Page 5: ...MM SS It depends on the P tnE parameter 1999 9999 00 00 99 59 10 Auto tuning is disable Auto tuning at setpoint Low PV type auto tuning This is done at 10 below SP during Auto tuning no Control is done by PID control automatically Output is manually adjusted by operator no Output percentage Adjustable when Hand is set to Yes 100 0 100 0 100 0 SOFT LEVEL Code Description Range Default Ramp rate for...

Page 6: ...output 1 0 2000 0 0 200 0 1 Hysteresis for ON OFF control on output 2 0 2000 0 0 200 0 1 Hysteresis of alarm 1 0 2000 1 Hysteresis of alarm 2 0 2000 1 Dead band value This defines the area in which output 1 and output 2 are both active negative value or the area in which output 1 and output 2 are both inactive positive value 1000 1000 100 0 100 0 0 Set point offset This value will be added to SV t...

Page 7: ...mal point please reconfirm the parameter 0000 000 0 00 00 0 000 0000 Output 1 control action Reverse action for heating Direct action for cooling Low limit of span or range Set the low limit lower than the lowest expected SV and PV display Full range 0 High limit of span or range Set the high limit higher than highest expected SV and PV display Full range 1000 Software filter 0 0 99 9 10 0 Time sc...

Page 8: ...t LnHi setting to correspond the high scale and after adjustment press key once for normal operation ALARM FUNCTION Select the alarm function nonE Alarm action off Hi Process high alarm with Form A contact Lo Process low alarm with Form A contact diF H Deviation high alarm with Form A contact diF L Deviation low alarm with Form A contact bd Hi Deviation band high alarm with Form A contact bd Lo De...

Page 9: ...en selected the alarm output and indicator latch as the alarm occurs The alarm output and indicator will be energized even if the alarm condition has been cleared unless the power is shut off When Timer function is selected PV SV timer function is available Standby and latch mode AUTOMATIC AND MANUAL OUTPUT CONTROL Automatic control is the normal mode of controller operation In automatic control m...

Page 10: ...ints and also specify how long the cooling must stay on each time it switches on using the hysteresis adjustment 7 When using the alarm for cooling the first thing to do is select the Alarm Function that links the alarm to the setpoint by a fixed Gap You will find on your unit that the factory default is set to this so it is not necessary to change anything That is Alarm Function diF H Deviation a...

Page 11: ...D control The auto tune process can last from several minutes up to two hours depending on the system s parameter A time out error will occur if the auto tune process cannot be completed within two hours in this case try to set the PID parameters manually Under normal circumstances if it does not complete within say 10 minutes something is wrong To abort an auto tune process simply set the paramet...

Page 12: ...eading then when it goes out of range the ader error Auto tune time out error Set Pb ti td manually Keypad no function Keypads are locked Keypads defective Set to a proper value Replace keypads Process value unstable Improper setting of Pb Ti Td and CT Start AT process to set Pb Ti Td automatically Set Pb Ti Td manually No heat or output No heater power or fuse open Output device defective or inco...

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