10
ID-299 Iss 3 08/07/98
9
ID-299 Iss 3 08/07/98
Problems
The following list covers the most commonly encountered questions asked by users and some possible causes.
There is no display on the controller
1
The ON/OFF switch on the controller (see fig 1) is in the OFF position.
2
The kiln is switched off at an Isolator .
3
A fuse has blown in the kiln or the supply which feeds the kiln.
The controller displays OPEN
1
The Thermocouple, or the wires between it and the controller, are damaged.
For a quick check;-
Switch OFF, Short + and - on the instrument T/C input, Switch ON. Display should show aprox 20ºC.
The controller displays FAIL
1
The wiring to the thermocouple is reversed.
When I turn on the controller it starts to run a program immediately.
1
You have switched OFF the controller while a program was running. It is advisable to clear any lights on the mimic using
the STOP / START button before you switch off .
When I attempt to run a program I cannot change the program number.
1
If any lights show on the mimic you have a program either running or being viewed , you must clear these lights before
you can change program.
2
Pressing the STOP / START key will only run the current program. To change a program you must run the sequence
shown in the “quick guide” .
The Kiln Under fires
1
If the controller ‘kiln’ light is on but kiln is not heating the fault is in the kiln or it’s wiring. Or;
You have an energy regulator on the kiln which is not at 100%. Or;-
The kiln has a faulty element. (See also ‘During the Firing’)
2
The thermocouple type does not match the instrument. (See “Electrical connections”)
3
Loose wires to the thermocouple (The display may be erratic.)
The Kiln Over fires
1
The thermocouple type does not match the instrument.
2
You have a sticking contactor in the kiln - Refer to an electrician
3
Loose wires to the thermocouple (The display may be erratic.)
When I attempt to enter a temperature in a program it will not go above a certain point.
1
A safety limit is available to prevent excessive temperatures being programmed. Check that this is correct for your
application. (See “Configuration” to change this value)
The Damper does not operate at the end of a firing.
1
You must ensure that the values entered in a program cause the firing cycle to pass through the switching points entered
into the relay temperature. If you do not the controller may have ended its program, and hence stopped any further actions,
before the desired switching of the damper.
When I press a key the controller displays ‘Lock’
1
The security lock has been activated. You should refer to the ‘Security Lock’ instructions. Use the Set Lock Number’
instructions to determine , or change, the current lock number The ‘Locked Operation’ instructions define the way to
operate the controller with this security active.
Configuration
The controller operation may be modified to satisfy a variety of situations by amending the parameters.
This information is given for completeness and should only be modified by experienced personnel.
To access these parameters first switch the controller OFF. Press and hold the secret key while switching the controller ON. Continue
to hold the secret key until the first parameter below is shown. Release the secret key and continue as shown below.
Thermocouple type
tc.?
Use
↑
/
↓
Keys to select. r,S,n,k
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Setpoint Limit
SP-L
Press secret key to display
Default 1350ºC
Use
↑
/
↓
to modify
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Control Strategy (3 Zone Control ONLY)
Con.?
Use
↑
/
↓
to modify
0 = Differential (Default)
1 = Absolute
NB In differential mode the slaves follow the measured value from the main zone.
In absolute mode the main and slaves all follow the controller setpoint.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Offset (zone 1 - see NB 1)
1. ??
Use
↑
/
↓
to modify
Range = +99 to -99(ºC).
Default = 0
This value is added to the controller setpoint and thus allows trimming of the achieved temperature in
the kiln. e.g. I-05 is entered when the controller is at 500ºC Then this zone will be attempting to control
at 495ºC
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Proportional Band (zone 1- see NB 1) These values are qualitative and do not relate to engineering units
P1.??
Use
↑
/
↓
to modify
Range = 0 to 99 Default = 13
This defines the band over which the controller gives proportional control
A setting of zero gives ON/OFF control
A setting of one gives the narrowest control band (tightest control)
A setting of 99 gives the widest control band
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Integral Time (zone 1- see NB 1) These values are qualitative and do not relate to engineering units
l I ??
Use
↑
/
↓
to modify
Range = 0 to 99 Default = 20
The integral time sets the rate of which the controller reduces any offset between desired (Setpoint) and
measured temperature.
A setting of zero turns Integral action OFF
A setting of 99 gives the slowest response.
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
Derivative Time (zone 1- see NB 1) These values are qualitative and do not relate to engineering units
d1.??
Use
↑
/
↓
to modify
Range = 0 to 99 Default = 90
The Derivative time sets the rate of reaction to a rapid change in measured value.
A value of 99 gives the slowest response
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - Press
→
to proceed
NB. 1
These parameters are then repeated for zones 2 + 3 (the slaves)
The Default values for Zones 2 + 3 Integral and Derivative are zero.
TO EXIT THIS FUNCTION PRESS
NB, 2 Parameters are only stored when the
→
Key is pressed after making a change
If you change a parameter and then press then this last item is not updated.
DISPLAY
MEANING
OPEN
Thermocouple open circuit.
FAIL
Thermocouple connection reversed.
Err3
Not in use.
Err4
Process temperature has exceeded higher program by 20
∫
C
Err5
Error reading internal memory. Refer to supplier.
Err6
Error reading internal memory. Refer to supplier.