Created Date: February 23,2017

Created by: Snider

Hi All,

I hope this is the most appropriate place to post this.

I am having trouble with a machine that heats up a cleaning tank of water that involves a rinsing process. For the weekends when the machine is not being used, we turn the temperature down on the Solo SL4848. The operator hit a number of buttons and messed up the settings while trying to recover from the initial mistake. Initially, temperature was reading way above what the SV and i figured out he changed the temperature offset resulting in skewed numbers. Numbers now match and the control is now hitting the correct temperature.

Once the heater is up to the set value of 92 deg C, a red LED on the tank should turn off to indicate the machine is ready to run the cycle. Currently this light is not turning off and we can not run the cycle. Following are the current settings on the SL4848. By the way, I am a machinist with little experience in PLC and these types of controls.

Input type J

Unit C

Range High 999.9

Range low -99.9

CTRL onof

S-HC heat

ALA1 4

ALA2 0

ALA3 0

SALA OFF

COSH OFF

C-SC ASCII

C-NO 1

BPS 9600

LEN 7

PRTY EVEN

STOP 1

I have found in the manual, chapter 5, an explanation of on/off control. I have a place to adjust the heating hysteresis but i have no field for the dead band. Is there a setting that will enable this?

I hope I have included enough information for anyone interested in helping me out.

Thanks,

Snider

Created Date: February 23,2017

Created by: techme

What is AL1L and AL1H set to? It is probably working off alarm contacts. Right now the alarm type is set to "4 " so the output would be on for any temp above the Temp Setpoint - whatever is in AL1L and Temp Setpoint + whatever is in AL1H. So if AL1L is 5 and AL1H is 5 and the setpoint is 92 the alarm output contacts will turn on at 87 and turn off at 97. If you are not sure if you are using AL1 you can look at the wiring. There should be something wired to terminals 14 & 15 if you are using it.