JK-WBN-300A New Thermostatic Water Bath(Economy)

Symbol

Name

Setting range

Description

Factory set value

AL

Alarming setting

0-Full Range

0.0-Full Range

When temperature is beyond SP+AL,the ALM indicator turn on. The buzzer sounds and the heating power turn off.

CL

Refrigeration control setting

0-Full Range

0.0-Full Range

When the temperature less than SP+COL, the refrigeration point is turn on to  drive the compressor.

without this function

P

Proportional Band

1-Full Range

1.0-Full Range

Proportional control action. If P is larger, then the gain of system is lower. It only use on the heating side.

I

Integral Time

0-3600 seconds

Integrated time constant. I larger, then the integrated action is smaller.

D

Derivative Time

0-3600 seconds

Derivative time constant. D larger, then the derivative action is also larger D can overcome overshoot. I=0and D=0 is called half proportional control.

Ar

Overshoot Control(re-setting)

1-100%

At on-off PID control, the value of Ar is a constant which equals 1.5-2times of the ratio of on time to the on-off period in the equilibrium state, In the half proportional control, the Ar equals coefficient/P.

T

Heating period

1-300seconds

For the thyristor output it is abut 1-3seconds.For those equipment that the superfluous power provided is comparatively larger, select larger T would decrease the stable error caused by PID control.

Pb

Zero point adjust

(intersection)

-100-100

-100.0-100.0

When the zero error comparatively smaller and the full point error comparatively larger, to update this value should be needed. Ordinary for pt100 ,updating this value is rarely needed..

PK

Full point adjust(intercept)

-1000-1000

seconds

When the zero error comparatively larger and the full point error also comparatively larger, to update this value should be needed. PK=4000×(setting value-actual value)/actual value. For pt100 adjusting this value is need at first time.

Ct

Refrigeration control Time delayed

0-3600seconds

When measuring value reaches its alarm value, the alarm relay output will be +delayed this time…

Without this function

dp

The decimal point setting

0;1

When D=0 the display resolving power is 1°C and when DP=1 the display resolving power is 0.1°C

rH

The range setting

0-  400°C

0.0-400.0

Adjusting rH can make the instrument range equals 0-rH(°C)

LK

Password key

0-255

When LK=18 the parameters listed above then the above parameters can be updated.

Problems

Causes

Handling methods

1. No supply

1.The plug is not inserted well or the

  wire is disconnected.

1. Insert the plug and connect the  wire.

2. Fuse is open.

2. Replace the fuse.

2. The temperature in

  the cabinet does

  not increase.

1. The set temperature is low.

1. Adjust the set temperature.

2. The electric heater does not work.

2. Replace the electric heater.

3. The temperature control instrument

  does not work.

3.Replace temperature control

  instrument.

4. The cyclic fan does not work.

4. Replace the fan.

3.The set temperature has a big difference from the temperature in the cabinet.

1.The temperature sensor does not

  work.

1. Change temperature sensor.

2.The fine tuning potentiometer for setting temperature is not adjusted well.

2. Adjust the potentiometer.

4.The over-temperature

  alarm is abnormal.

1. The set temperature is low.

1. Adjust the set temperature.

2.The temperature control instrument

  does not work. 

2. Replace the temperature

  control instrument.