Ningbo, Zhejiang, China
Member Since: 2006
Business Type: Manufacturer/Factory & Trading Company
|ALM1||High limit alarm||When the measured value more than ALM1+Hy, the meter have upper limit alarm. When the |
measured value less than ALM1-Hy, the meter will free from the upper limit alarm. Set the
ALM1 =9999 can avoid come into being alarm function.
|-1999~+9999C or 1 unit||9999C|
|ALM2||Low limit alarm|| When the measured value less than ALM2-Hy, the meter have lower limit alarm. When the |
measured value more than ALM2+Hy, the meter will free from the lower limit alarm. Set the
ALM2=-1999 can avoid come into being alarm function
|The same as above||1999C|
|Hy-1||Positive deviation alarm|| When the deviation (PV-SV)> Hy-1+Hy, the meter have positive deviation alarm. When the |
deviation less than Hy-1-Hy, the meter will free from the positive deviation alarm. If set the
Hy-1=9999 (temperature is 999.9C),the alarm will be cancelled. When use ON/OFF
adjustment, Hy-1 and Hy-2 are the second upper limit and lower limit absolute value alarm..
|Hy-2||Negative deviation alarm|| When the negative deviation(SV-PV)>Hy-2+Hy, the meter have negative deviation alarm. |
When the negative deviation(SV-PV)
|The same as above||9999C|
|Hy||Dead band|| Hy is set to permits protection of position control output from high switching frequencies |
caused by process input fluctuation.
If the meter use ON/OFF adjustment or parameter setting itself , provided appointed value
SV is 700C, Hy is 0.5C, by reaction adjustment (heating control)
(1)Output is switch on , when the measure temperature value is more than 700.5C,
the (SV+Hy) will close.
(2)Output is switch off, when the measure temperature less than 699.5C (SV-Hy),
switch on again and heating.
|At||PID Control method||At=0, ON/OFF control, suitable for the application which don't need high precision.|
At=1, artificial intelligence control / PID control, allow to set the auto tuning function
from front panel.
At=2, startup auto tuning function, after auto tuning finish, it will set 3.
At=3, artificial intelligence control. After auto tuning finish, the meter automatism enter
into this set, this setting don't allow to set from front panel.
|I||Hold parameter||I, P, D, t these parameter are for artificial intelligence control algorithm, |
but no for ON/OFF control mode (At=0).
I is defined as measurement variation after output is changed. Generally I parameter of
the same system will changes with measurement value, and so I parameter should be
configured with process value around operation point.
For example: take temperature control of electric furnace, operating point is 700C, to find
optimum I parameter, assuming that when out remains 50%, the temperature of electric
will finally be stabilized around 700C, and when output changes to 55%, the temperature
will final be at around 750C. The I (optimum parameter)=750-700=50.0 (C)
I parameter mainly determines the degree of integral function, similar as integral time of
PID control. When the I smaller, the calculus function strong. When the I larger,
the calculus function weaken (calculus time add). When I=0, the system will cancel
the calculus function and artificial intelligence adjustment function, the instrument will
turn to an PD adjustment.
|P||Rating parameter||P is in reverse proportion to measurement variations caused by output changes by 100%|
in one sec..
When At=1 or 3, then P=1000÷measurement elevatory value per sec. , the unit is 0.1C or
1 defined unit.
Example: the instrument use 100% power to heat and there is no heat loss, electric cooker
1C each sec., then P=1000÷10=100. P like PID instrument's proportion area, but diversification
is reverse. P↑, the proportion and differential function↑, if P↓, the proportion and differential
function↓. P parameter and calculus function have no relation. Set P=0 corresponds to P=0.5
|d||Lag time|| Parameter "d" is applied as one of the important parameters of XMT808 artificial intelligence |
control algorithm. "d" is defined as follows: time needed for a electric furnace from the beginning
of elevating temperature to get to 63.5% against the final speed of temperature elevating, provided
there is no heat loss. The unit of parameter "d" is second.
For industrial control, hysteresis effect of the controlled process is an important factor impairing
control effect. The longer is system lag time, the more difficult to get ideal control effect. Lag time
parameter "d" is a new introduce important parameter for XMT808 artificial intelligence algorithm.
XMT808 series instrument can use parameter "d" to do fuzzy calculation, and therefore overshoot
and hunting do not easily occurs and the control have the best responsibility at the time.
Parameter "d" gives effect on proportion, integral and differential function. Decreasing
parameter "d" will strengthen proportional and integral function and weaken differential function,
with the extent of strengthening greater than that of weakening. And therefore as a whole
decreasing "d" will strengthen feedback function. If d≤T, derivative function of system will be
|t||Output period|| Parameter can be set between 0.5 to 125s (0 means 0.5s). It represent the instrument of the |
calculate speed. When t↑, the proportion function↑, differential function↓. When t↓, the proportion
function↓, differential function↑. When t≥5s, differential function is absolutely eliminated, then the
system is a proportional or proportional-calculus adjustment. If the t less than 1/5 of its lag time,
the change is very small influence to control. If d=100, the t set 0.5 or 10s the control effect basic
(1)it is insignificant when ON/OFF control ;
(2)Relay output:'t'usually be set 10s upwards,other output method be set 1~2s;output is relay
output, the shorter the time, the better the control effect ,but it will affect the relay's
|Sn||specification Input||Sn Input specification:||0-37||0|
|Sn||Input spec.||Sn||Input spec.|
|8-9||special thermocouple||10||Client appointed to increase input specification|
|21||PT100||22-25||Special thermal resistance|
|26||0-80Ωresistance input||27||0-400Ωresistance input|
|28||0-20mV voltage input||29||0-100mV voltage input|
|30||0-60mV voltage input||31||0-1V(0-500mV)|
|32||0.2-1V voltage input||33||1-5V voltage input or|
4-20mA current input
|34||0-5V voltage input||35||-20-+20mV(0-10V)|
|36||-100-+100mV or 2-20V voltage input)||37||-5V-+5V(0-50V)|
|dP||Decimal point position||When it is linearity input: parameter dP is used to define decimal point place according to users' habit|
dP=0, display pattern is 0000, decimal point not displayed
dP=1, display pattern is 000.0, decimal point is at ten's place
dP=2, display pattern is 00.00, decimal point is at hundred's place
dP=3, display pattern is 0.000, decimal point is at thousand's place
In case of thermocouple or RTD input: dP is used to define temperature display resolution
|dP=0, temperature display resolution is 1C|
dP=1, temperature display resolution is 0.1C
Adjustment of this parameter only affects the display, and gives no effect on control precision or measurement precision
|P-SL||Input lower limit||(1) When the linearity input define single lower limit value, external appointed, output display.|
For example: a pressure transmitter is used to convert pressure signal ( temperature, flow and humidity signals also possible) to standard 1-5V input (4-20mA can external contact 250Ωresistance to change). 1V signal pressure is 0, 5V signal pressure is 1mPa, if want the instrument display is 0.001mPa. the parameter can be set as the following:
Sn=33 (select 1-5V linearity voltage input)
dP=3 (set decimal point, display 0.000)
P-SL=0.000 (define the pressure display value when the input lower limit 1V)
P-SH=1.000(define the pressure display value when the input upper limit 5V)
(2) When the thermal resistance, thermocouple input defining lower limit appointed value.
|P-SH||Input upper limit||When the linearity input defining single upper limit value, use with P-SL .||The same as above||2000|
|Pb||Input shift||Parameter Pb is used to make input shift to compensate the error produced by sensor or input signal itself. For thermocouple input, parameter Pb is used to correct reference junction compensation error.||-199.9~|
|oP-A||Output mode||Op-A denote output signal mode, and must conform to the module type installed as main output. |
Op-A=0, the mode of main output is time-proportional output (for artificial intelligence control) or ON/OFF mode (for ON/OFF control). If output modules such as SSR voltage output or relay contact discrete output, it should set Op-A=0.
Op-A=1, any specification linear current continuum output,
Op-A=2, time proportional output
|outL||Output lower limit||Restrain minimum value of adjust output||0-110%||0|
|outH||Output upper limit||Restrain maximum value of adjust output.||0-110%||100|
|AL-P used to define ALM1, ALM2, Hy-1 and Hy-2 alarm output locality. Its function is determined by the following formula:|
AL-P= A x 1 + B x 2 + C x 4 + D x 8 + E x 16
If A=0, then upper limit alarm by the relay2 output
If A=1, then upper limit alarm by the relay1 output
If B=0, then lower limit alarm by the relay2 output
If B=1, then lower limit alarm by the relay 1output
If C=0, then positive deviation alarm by the relay 2output
If C=1, then positive deviation alarm by the relay1output
|If D=0, then negative deviation alarm by the relay 2 output|
If D=1, then negative deviation alarm by the relay 1output
If E=0, then alarm types, such as "ALM1" and "ALM2" will be displayed alternately in the lower display window when alarm occurs.
For example: If it need that the upper limit alarm by the alarm1 relay output, lower limit alarm\positive deviation alarm and negative deviation alarm by alarm2output, when alarm occurs no alarm type display in the lower display window. Then we reach a conclusion: A=1\B=0\C=0\D=0\E=1, and parameter "AL-P" should be configured to:
|CooL||System function||COOL is used to select some system function: |
A=0, reaction control mode, if the input increase, the output will diminishment like heating control.;
A=1, direct action control mode, if input increase, output will increase like cooling control.
B=0, without the function of alarm while at the power on or SV change
B=1, have the alarm function while the power on and when the SV change have no alarm function.
|When the instrument have RS485 , Addr can be configured the ranged of 0 to256 In the same communication line's instruments, every one need have a different address.||0-256||0|
|When the instrument have communication interface, parameter bAud is communication baud rate, the range is 300-19200bit/s(19.2K).||-||9600|
|When the FILt value set large, the measurement value is stabilized but the response time is longer..||0-20||0|
|A-M is define manual / automatic control state |
A-M=0, manual control state
A-M=1, automatic control state
A-M=2, automatic control state, in this state manual operation is prohibited. When the manual function is not required, it can avoid entering manual state due to operator's false operating.
If use the RS485 to control the instrument, the transfer of automatic/manual status can be carry out by adjusting parameter A-M from computer.
|LocK||lock||Lock=0, can set locale parameter and SV. |
Lock=1, can display and view the locale parameter, but don't to modification. The SV can set.
Lock=2, can display and view the locale parameter, but the locale parameter and SV all cannot modification.
Lock=808, all the parameter and SV can set.
When the Lock is set other values except 808, then only locale parameter the range of 0 to 8 r and parameter Lock itself can be display and set.
|When configuration of the instrument is completed, most parameters will not need to be locale operators. Furthermore, locale operators may not understand many parameters, and may probably set parameters incorrectly by mistake and make the instrument unable to work.|
EP1-EP8 defines 1-8 locale parameters for operators' user in parameter table. Their parameter values are parameters except parameter EP itself like ALM1\ALM2, etc. When LOCK=0,1,2 and so on, only be defined parameter can display, other parameters can not be displayed and modified. This function can speed up the parameter modification and prevent important parameters (like input, output parameters) from modifying falsely.
Parameter EP1-EP8 can define 8 locale parameters at most, if the number of locale parameters is less than 8 (sometimes even none), it is necessary to define useful parameters from EP1-EP8 in order, the first parameter which are not used is defined as none. For example, two parameters of ALM1 and ALM2 are need to be modified by locale operators, the parameter EP can be set as follows:
Sometimes locale parameters are not needed after we finish adjusting the instrument, we can set EP1 parameter an nonE