Lily Tech ZL-7903A User manual

Suzhou Lily Tech Co., Ltd.
Page 1, Total 8 Pages
ZL-7903A TemperatureandHumidity Controller
V2.7
Catalog
Feature..........................................................................................................................................................................................................2
Main Function...............................................................................................................................................................................................2
Specification.................................................................................................................................................................................................2
Product Version............................................................................................................................................................................................2
Key and Display...........................................................................................................................................................................................2
Key............................................................................................................................................................................................................3
Display......................................................................................................................................................................................................3
Buzzing.....................................................................................................................................................................................................3
Key Operation..............................................................................................................................................................................................3
Fast Set Temperature (T11), Fast Set Humidity (H20)....................................................................................................................3
Parameters Setting.................................................................................................................................................................................3
Parameter Table.....................................................................................................................................................................................4
Control Function...........................................................................................................................................................................................5
On/offline set...........................................................................................................................................................................................5
Ventilation Fan (R2) Control.................................................................................................................................................................5
Door Control (according to door switch S1, optionalfunction)........................................................................................................5
Temperature Control (R1, SSR)...........................................................................................................................................................5
R1 control (T10 = 0)...........................................................................................................................................................................5
External SSR hysteresis control (T10 = 1).....................................................................................................................................5
External SSR PID control (T10 = 2)................................................................................................................................................5
High temperature protection.............................................................................................................................................................5
Humidity Control (R3).............................................................................................................................................................................5
Humidify control (H10 = 1)................................................................................................................................................................5
Dehumidify control (H10 = 0)...........................................................................................................................................................5
High humidity protection...................................................................................................................................................................5
Egg-turning Control (R6, R7) ................................................................................................................................................................5
Mode 0 (U16 = 0):..............................................................................................................................................................................5
Mode 1 (U16 = 1):..............................................................................................................................................................................5
Egg turning times:..............................................................................................................................................................................5
Check tray data:.................................................................................................................................................................................6
Output R5 Control...................................................................................................................................................................................6
R5 as periodical air exhaustion (U20 = 0)......................................................................................................................................6
R5 as periodical air exhaustion + temperature and humidity high limit protection (U20 = 1)................................................6
R5 as periodical air exhaust + temperature high limit protection (U20 = 2).............................................................................6
R5 as periodical air exhaust + humidity high limit protection (U20 = 3)....................................................................................6
Output R4 Control...................................................................................................................................................................................6
R4 as illumination control (U30 = 0)................................................................................................................................................6
R4 as Temperature and humidity high limit protection (U30 = 1)...............................................................................................6
R4 as Temperature high limit protection (U30 = 2)......................................................................................................................6
R4 as Humidity high limit protection (U30 = 3)..............................................................................................................................6
Output R8 (R9) Control..........................................................................................................................................................................6
R8 as alarm output (U40 = 0)...........................................................................................................................................................6
R8 as Temperature and humidity high limit protection (U40 = 1)...............................................................................................6
R8 as Temperature high limit protection (U40 = 2)......................................................................................................................6
R8 as Humidity high limit protection (U40 = 3)..............................................................................................................................6
Alarm.........................................................................................................................................................................................................6
Alarm temperature and humidity:....................................................................................................................................................6
Alarm action........................................................................................................................................................................................6
Auto Restart Function ............................................................................................................................................................................7
Incubation Day Counter.........................................................................................................................................................................7
Restore to Factory Default Settings.....................................................................................................................................................7
Fahrenheit/Celsius display....................................................................................................................................................................7
Manually Checking the Outputs One by One.....................................................................................................................................7
Attention........................................................................................................................................................................................................7
Wiring Diagram............................................................................................................................................................................................7
Dimension.....................................................................................................................................................................................................8
Apendix: PID control....................................................................................................................................................................................8

Suzhou Lily Tech Co., Ltd.
Page 2, Total 8 Pages
Feature
ZL-7901A is an industrial intelligent temperature and humidity controller. Optional external SSR to realize bigger heating
power rate, and with optional temperature PID control. With touch button and big size LCD display, convenient to operate,
easy to set up. Applicableforcontrol of incubator,climatechamber,warehouse,and soon.
Main Function
1. Ventilationfan control
2. Dooropen/closecheckand control
3. Three temperature control modes:relaysup/down limitcontrol,SSRup/down limitcontrol,SSR PID control
SSR up/down limit control: is able to set power rate when the room temperature is close to setpoint.
4. Humidifyordehumidifycontrol
5. Timerairexhaust control
6. Timereggturning control
7. Illuminationcontrol
8. Alarm output
9. Auto restart function
10. Temperature/humidityoverlimitwarning andprotection
11. Temperature/humiditysensorfaultwarningandprotection
Specification
◇Powersupply: 100～240VAC,50 or 60Hz
◇Output and input:
Output
Input
Heatercontrol relay
250VAC
7.5A / 1.0A*
Resistive
load
R1
Temperature sensor:NTC, 5K/3470
Ventilation controlrelay
7.5A / 1.0A*
R2
Humiditysensor:ZL-SHr05J
Humiditycontrol relay
7.5A
R3
Lamp controlrelay
7.5A
R4
Air exhaustcontrol relay
3A
R5
Egg turningrelay
1A
R6/R7
Alarm outputrelay
1A
R8/R9
SSR driver
20mA/10VDCMAX
Y+/Y-
*.When driveby relay for heater(T10= 0), the spec. is 7.5Arated current. For tungsten lamp as heater, it is 1.0A!
◇Setting range:humidity0 ~ 99%RH, temperature0 ~ 100℃
◇Measuring absoluteaccuracybeforecalibration:temperature 1%@25℃,humidity3%@25℃
◇Working environment:-20~ 45℃, 10 ~ 90% RH without dewing
Product Version
When powersupplied,thecontrollerwilldisplaymodeland firmwareversion: ZL-7903A,version2.7:
Key and Display

Suzhou Lily Tech Co., Ltd.
Page 3, Total 8 Pages
Key
Key
Function
Remark
Power
Keep depressedfor3 secondsto turn online/offline
Set
Short press to switch between humiditysetand temperature set;
Longpress to set other parameters(see Parameter Table below)
+
Increasethe set value.Keep depressedforfastset
-
Decrease the set value.Keep depressedforfastset
Enter
Confirmation
Reset
Short press forcancel and return;
Long press to clear incubating accumulated dayscounter
Lamp
Turn the lamp off/on
Fn
Combinationkey
Display
Icon
Function
On
Off
Blinking
Humidify/dehumidifystate
Energized
De-energized
Main heater
Energized
De-energized
Auxiliaryheater
Energized
De-energized
Air exhaust
Energized
De-energized
Egg turningmotor,turn right
Energized
De-energized
Egg turningmotor,turn left
Energized
De-energized
Warning
---
No warning
Warning
E01
Temperature sensorfault
Warning
No warning
E02
Humiditysensorfault
Warning
No warning
tHi
Temperaturehigherthan up limit
Warning
No warning
tLo
Temperaturelowerthan down
limit
Warning
No warning
HHi
Humidityhigherthan uplimit
Warning
No warning
HLo
Humiditylowerthan downlimit
Warning
No warning
UnL
Restore to defaultparameters
Restoring to defaultparameters
dr
Dooris opened
Dooropen
Buzzing
Every key press, there willbea beep.
When there is error of sensors, high/low limit temperature or humidity warning, there will be buzzing warning. Any key
press can stop the warning.
Key Operation
Fast Set Temperature (T11), Fast Set Humidity (H20)
Press to switch between temperature andhumiditysetting.Press and to set the value.
Press to save the setting.
Press , or without key operationfor30 seconds, exit the mode,andthe set value is not saved.
Parameters Setting
Keep and depressedsimultaneouslyfor3 seconds.LCD shows “Psd 000”.
Press and to enter password (default “000”).Press to confirm.
If the password is correct, enter into parametersetting mode,else exit.
Press to select parametercode,press and to set the value,press to save the setting.
Press , or without key operationfor30 seconds, exit the mode,andthe set value is not saved.

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Page 4, Total 8 Pages
Parameter Table
Code
Function
Range
Unit
Indication
Default
T10
Temperature control working mode
0 ~ 2
0: R1 up/down limit control
1: External SSR, up/down limit control
2: External SSR, PID control
0
T11
Temperature set point
0.0 ~ 100.0
℃/℉
37.8
T12
Temperature hysteresis for R1 (T10 = 0)
0.0 ~ 20.0
℃/℉
Relative to T11, absolute value: T11 - T12
0.2
T13
Temperature hysteresis for SSR (T10 = 1)
0.0 ~ 20.0
℃/℉
Relative to T11, absolute value: T11 - T13
0.3
T14
Min stop time for temperature load (R1)
0 ~ 999
sec
1
T20
Temperature calibration
-9.9 ~ +9.9
℃/℉
0.0
T21
High temp. alarm relative point
0.0 ~ 65.0/dis
℃/℉
dis: disable warning. Absolute point= T11 + T21
dis
T22
Low temp. alarm relative point
0.0 ~ 65.0/dis
℃/℉
dis: disable warning. Absolute point = T11 - T22
dis
T25
High temp. protection relative point
0.0 ~ 65.0/dis
℃/℉
dis: disable warning. Absolute point= T11 + T25
Ref.: U20 = 1/2/3, U30 = 1/2/3, U40 = 1/2/3
0.2
T26
Hysteresis for T25
0.0 ~ 65.0
℃/℉
Absolute point = T11+T25-T26
Ref.: U20 = 1/2/3, U30 = 1/2/3, U40 = 1/2/3
0.1
T30
Proportion of SSR PID
0.1 ~ 5000
Power/℃
Kp for PID
39.3
T31
Integration ofSSR PID
0 ~ 5000
sec
Ti for PID. If Ti = 0, shut integration.
15.7
T32
Differential of SSR PID
0 ~ 5000
sec
Td for PID. If Td =0, shut differential.
40.5
H10
Dehumidify / humidify mode
0 / 1
0: dehumidify, 1: humidify
1
H20
Humidity set point
0 ~ 99
%RH
50
H21
Humidity hysteresis
0 ~ 50
%RH
Relative to H20, absolute value: H20 - H21
5
H22
Humidity calibration
-9.9 ~ +9.9
%RH
0.0
H23
Minimum stop time for humidity load (R3)
0 ~ 30
min
0
H24
High humidity warning relative point
0 ~ 80/dis
%RH
dis: disable warning. Absolute point= H20 + H24
dis
H25
Low humidity warning relative point
0 ~ 80/dis
%RH
dis: disable warning. Absolute point = H20 - H25
dis
H26
High humidity protection relative point
0 ~ 80/dis
%RH
dis: disable warning. Absolute point= H20 + H26
Ref.: U20 = 1/2/3, U30 = 1/2/3, U40 = 1/2/3
5
H27
Hysteresis for H26
0 ~ 80
%RH
Absolute point = H20-H26-H27
Ref.: U20 = 1/2/3, U30 = 1/2/3, U40 = 1/2/3
2
U10
Left turn (R6) time unit
1 ~ 2
1: minute, 2: hour
1
U11
Left turn (R6) time of the timer
1 ~ 999
120
U12
Right turn (R7) time unit
1 ~ 2
1: minute, 2: hour
1
U13
Right turn (R7) time of the timer
1 ~ 999
120
U14
Turning times
0 ~ 999
0: unlimited turning times
0
U16
Turning motor working mode
0 / 1
0: Either R6 or R7 will be energized.
Need position switches, position arrival shuts off
the power supply to motor
1: Only energized during turning moment (U17).
Manual egg turning support
1
U17
Motor being energized time for every turning
0 ~ 999
sec
Effective only when U16 = 1
30
U18
Hatching days
0 ~ 99
day
0: disabled hatching days counting
0
U20
Output R5 (air exhaustion) control mode
0 ~ 3
0: Air exhaust
1: Air exhaust + humi./temp. high limit protection
2: Air exhaust + temperature high limit protection
3: Air exhaust + humidity high limit protection
1
U21
Time unit for air exhaust period (R5)
0 ~ 2
0: second, 1: minute, 2: hour
1
U22
Air exhaust period (R5)
1 ~ 999
30
U23
Time unit for air exhausting time (R5)
0 ~ 2
0: second, 1: minute, 2: hour
0
U24
Air exhausting time (R5)
1 ~ 999
30
U30
Output R4 (Lamp or protection) control mode
0 ~ 3
0: illumination control
1: temperature and humidity high limit protection
2: Temperature high limit protection
3: humidity high limit protection
0
U34
Output R4 delay time for automatic shutdown
1 ~ 999
Min
Only effective when U30 = 0
2
U40
Output R8 (alarm or protection) control mode
0 ~ 3
0 = alarm output
1 = temperature and humidity High limit protection
2 = temperature high limit protection
3 = humidity high limit protection
0
U50
Door switch mode
0 / 1
0: Normal close, 1: Normal open
0
U65
Buzzing warning option
0 /1
0: disable warning, 1: enable warning
1
U90
Password
000 ~ 999
000 = no password
0
U93
PID self auto tune power rate
10 ~ 100
%
Percent of heater’s full power rate
50

Suzhou Lily Tech Co., Ltd.
Page 5, Total 8 Pages
Control Function
On/offline set
Keep depressed for3 secondsto switch betweenonlineandoffline.The controlling onlyworkswhenonline.
Ventilation Fan (R2)Control
When online,ventilationison.
When offline,ordooris open,ventilation stops.
Door Control (according to door switchS1, optional function)
ParameterU50set the switch controlmode:
Normalopen:U50= 1: When door is open,the doorswitch is open.When dooris closed, the switch is short inside.
Normalclose:U50= 0: Whendoor is closed,the door switchis short inside.When dooris open, the switch is open.
Factory setting: U50 = 0. In this setting, if without a door switch, the controller thinks the door is closed always.
When dooris just opened,the lampwillbeon forU34 (undersetting U30= 0), evenin offline status.
When dooris just closed,the lampwill be off.
When dooris open:heater andventilation areoff,egg tray stops. If U16 = 1, manual eggtray control is still effective.
When dooris closed:heater can work, ventilation ison, eggtray can work automatically.
Temperature Control (R1, SSR)
R1 control (T10 = 0)
If room temperature≤(T11 - T12), and R1 has been stoppedforT14, R1 willbeenergized.
If room temperature≥T11, R1 willbe de-energized.
External SSR hysteresis control (T10 = 1)
If room temperature <T11, SSR willbe energized.
If room temperature≥T11, SSR will be de-energized.
SSR power rate:
When room temperature < (T11 –T13), SSR output is full power rate.
When room temperature ≥ (T11 –T13), SSR output is: U93* full power rate.
Example: if U93 = 50, the power rate is 50% of full power rate.
External SSR PID control (T10 = 2)
See paragraph Apendix: PID control
High temperature protection
Protectionreactioncould be R5, R4 or R8, dependson settings.
When room temperature≥ (T11 + T25), start protecting.
When room temperature ≤(T11 + T25 –T26), stop protecting.
Humidity Control (R3)
Humidify control (H10 = 1)
If room humidity ≤ (H20 –H21), and R3 hasstopped for H23, R3 will be energized.
If room humidity≥H20,R3 will be de-energized.
Dehumidify control (H10 = 0)
If room humidity ≥ (H20+ H21), andR3 has stoppedfor H23, R3 willbeenergized.
If room humidity ≤ H20,R3 willbe de-energized.
High humidity protection
Protectionreactioncould be R5, R4 or R8, dependson settings.
When room humidity≥ (H20+ H26), start protecting.
When room humidity≤(H20+ H26 –T27), stop protecting.
Egg-turning Control (R6, R7)
Mode 0 (U16 = 0):
Either R6 or R7 will be energized, need position switches, manual turning does not work.
When leftturningtime(U11) arrives,R6 energized,R7 de-energized.
When rightturningtime (U13) arrives, R7 energized,R6 de-energized.
Mode 1 (U16 = 1):
R6 and R7 is not energized when no turning, manual turning works.
When leftturningtime(U11) arrives,R6 energizedforU17.
When rightturning time (U13) arrives, R7 energized forU17.
Manual turning:
Keep and depressed simultaneously for 3second to enterinto the mode,R6 and R7 willbe
de-energized,the display will be flashing;
If keep depressed, R6 energized, displayed;
If keep depressed, R7 energized, displayed;
Keep and depressed simutaneously for 3sec, or nokey operationfor30 sec will exit the mode.
Egg turning times:
R6 starts once + R7 starts once = turning once. When egg turning times reachesU14, turning will not start anymore.
If turningtimes(U14)= 0, turningwillnever stop.

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Page 6, Total 8 Pages
Check tray data:
Lefttimesof egg turning and timeto the next eggturning:
When turningtimes(U14) ≠0, the left times of egg turning andtime to the next egg turning will displayalternatively.
When the accumulated times of egg turning ≥ U14, LCD will display “STOP”, there will be no egg turning.
Keeping depressed for3 secondswill reset the accumulated timesof eggturning andincubationdaycounter.
When turning times(U14)= 0, the egg turningwill never stop. LCDwill display time to the next egg turning.
Output R5 Control
R5 as periodical air exhaustion (U20 = 0)
When U22arrives, R5 is energized.
When U24arrives, R5 is de-energized.
R5 as periodical air exhaustion + temperature and humidity high limit protection (U20 = 1)
When thereis no warning,exhaustair periodically.
If room temp.≥T11 + T25, or room humidity≥H20+ H26,R5 energized.
If room temp.≤T11 + T25 –T26, and room humidity≤H20+ H26–H27, stop protection.
R5 as periodical air exhaust + temperature high limit protection (U20 = 2)
When thereis no warning,exhaustair periodically.
If room temp.≥T11 + T25, R5 energized.
If room temp.≤T11 + T25 –T26, stop protection.
R5 as periodical air exhaust + humidity high limit protection (U20 = 3)
When thereis no warning,exhaustair periodically.
If room humidity≥H20+ H26, R5 energized.
If room humidity≤H20+ H26 –H27,stop protection.
Output R4 Control
R4 as illumination control (U30 = 0)
Press to turn the lamp on/off.Whenthe lampisturnedon, it willbeoffafterU34 automatically.
Underthis setting,
When dooris opened,R4 willbe energizedforU34time. When dooris closed, R4 willbe de-energized.
R4 as Temperature and humidity high limit protection (U30 = 1)
If room temp.≥T11 + T25, or room humidity≥H20+ H26,R4 energized.
If room temp.≤T11 + T25 –T26, and room humidity≤H20+ H26–H27, stop protection.
R4 as Temperature high limit protection (U30 = 2)
If room temp.≥T11 + T25, R4 energized.
If room temp.≤T11 + T25 –T26, stop protection.
R4 as Humidity high limit protection (U30 = 3)
If room humidity≥H20+ H26, R4 energized.
If room humidity≤H20+ H26 –H27,stop protection.
Output R8 (R9) Control
R8 as alarm output (U40 = 0)
R8 will be energizedwhenthereis alarming.Alarming definition:seeparagraph Alarm
R8 as Temperature and humidity high limit protection (U40 = 1)
If room temp.≥T11 + T25, or room humidity≥H20+ H26,R8 energized.
If room temp.≤T11 + T25 –T26, and room humidity≤H20+ H26–H27, stop protection.
R8 as Temperature high limit protection (U40 = 2)
If room temp.≥T11 + T25, R8 energized.
If room temp.≤T11 + T25 –T26, stop protection.
R8 as Humidity high limit protection (U40 = 3)
If room humidity≥H20+ H26, R8 energized.
If room humidity≤H20+ H26 –H27,stop protection.
Alarm
Alarm temperature and humidity:
High temperaturealarming,when room temp.≥T11 + T21.
Low temperaturealarming,whenroom temp. ≤T11 –T22
High humidityalarming,when room humidity≥H20+ H24.
Low humidityalarming,when room humidity ≤H20–H25
Alarm action
When thereis alarm:
R8 energized(whenU40=0).
Buzzing(couldbe stoppedby any key press).
Displaythe reason table:

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Page 7, Total 8 Pages
Code
Remark
Real time detection
Delay
Duration
Reset
Action
E01
Temperature sensor failure
Yes
0 sec
6 sec
Auto
Alarming,
temperature output de-energized,
the other control not affected
E02
Humidity sensor failure
Yes
0 sec
6 sec
Auto
Alarming,
humidity output de-energized,
the other control not affected
tHi
High temperature
Yes
0 sec
5 sec
Auto
Alarming
tLo
Lowtemperature
Yes
0 sec
5 sec
Auto
Alarming
HHi
High humidity
Yes
0 sec
5 sec
Auto
Alarming
HLo
Low humidity
Yes
0 sec
5 sec
Auto
Alarming
dr
Door open
Yes
0 sec
1 sec
Auto
Related alarming,
temperature output de-energized,
ventilation de-energized,
humidity control output de-energized,
lamp on for U34 (when U30 = 0)
iCE
Touched IC fault
Yes
0 sec
5 sec
Auto
Auto RestartFunction
After powersupplystops, andcomesback, the controllerwill run underthe same settingsand status.
Incubation DayCounter
When controlling,the incubationdaycounterwillkeep counting.
If the countervalue reachesU18, controllerkeepscontrollingasnormal,andthe countervalue willbeflashing.
If the counter value reaches 99, stop counting. Keeping depressed for 3 seconds will reset the accumulated times
of egg turning andincubation daycounter.
Restore to Factory Default Settings
When the controllerisonline,keep and depressed simultaneouslyfor3seconds.The displayshows“UnL”.
Then press twice, the controllerwillrestore the parameterstofactorydefaultsettings.
Fahrenheit/Celsius display
Keep and depressedsimultaneouslyfor3 secondsto switch betweenFahrenheit/Celsiusdisplay.
Manually Checking the Outputs One by One
Keep depressed for3 seconds,LCD displays“CCC”.Then press twice to enter intomanual checking mode.
Now all outputsare de-energized.Press and to energizeR1/R2/R3/R4/R5/R6/R7/SSR in turn.
Attention
1. Please read this instruction carefully.Electrical wiring mustbe manipulated bycertified electrician. Wrong wiring may
damagethedevice andsystem seriously.
2. Avoid humid environment,or withcorrosive gases, or strong electric-magneticfield.Thedevice ispossibleabnormalin
such condition.
3.This product hasbeen strictly tested before shipping.The companywarrantyisone year, the responsibilityislimited to
the saleof the productitself.Damage causedbyimproperusageisnot covered by the warranty.
Wiring Diagram

Suzhou Lily Tech Co., Ltd.
Page 8, Total 8 Pages
Dimension
Apendix: PID control
Auto Tuning is able to find PID
parameters (Kp/Ti/Td, U30/31/32) automatically for most control system
1. Set powerrate duringauto tuning(U93).
2. Set set-point duringautotuning (SP, T11).
When not in set mode, keep and
depressed simultaneously for 5 seconds to
enter into self auto tuning mode: LCD will
display “Pid”. Press to start tuning. Then
LCD will display “At”.
After the room temperature (PV) reached SP, it
will vibratearoundSP for several times.
The controller will calculate the PID parameters
(Kp/Ti/Td, U30/31/32) according to these PV
data. And the “At” display disappears.
Note:
a. PID control, or hysteresis control?
Try hysteresis control1st (T10 = 1):
⚫Now is fullpowerrate heating.If PV is not able to reachSP within reasonable time,increase heater
powerrate.
⚫If PV overshoot to SP ≤ 0.2℃, or over falling to (SP–T12) ≤ 0.2℃: auto tuning is not able to get the PID
parameterscorrectly.
⚫If all are ok, try PID auto tuning.
Try autotuning(T10 = 2, start auto tuning):
Now the heating power rate is U93 percent of the heater’s power rate. Default U93 = 50.
If PV is not ableto reach SP withinreasonabletime,increaseU93value,or increaseheaterpower rate.
If the overshootor over falling toSP ≤ 0.2℃, auto tuning is not ableto get the PID parameterscorrectly.
The followingwillalsomakeautotuningfailure,orgetwrongPID parameters:
⚫The PV vibrationamplitudesdiffertoomuch.
⚫The PV vibrationperiodsdiffertoo much.
⚫The PV changes not smoothly (there are temperature interference, like opened door at some moment).
b. Try to get best parameters
If make 2 autotuning, the tuned PID parametersare similar,we couldusethe averagedata for application.
If the 2 tuneddata are not similar,autotuningthe 3rd times.
When the environment temperature, or object inside (empty box and box with goods inside are not same
system), or air flow speed inside changed greatly,it needsauto tuning again.
c. About PTC heating element
PTC has a Curie point parameter. When PTC’s temperature is high than Curie point, its power rate will be
reducedto almostzero, the PID control willfail.
With higher Curie PTC heater, with good dissipatorfor heater, with high air flow speed around heater to avoid
the failure.
d. Manual tuning principle
Manualtuningcouldrevisethe control result. Kp = U30,Ti = U31,Td = U32.
Increase Kp, increasethe speed of control, but more overshootand biggervibration.
Increase Ti, get more accuratetemperature,but need longertime to reach SP afterstating heating.
Increase Td, fast reaction to control, but add more “noise” to the control result.