214
8.3.20
During AT loop disconnection detection function
A loop disconnection can be detected during auto tuning (AT) using this function. With this function, a channel that is
not controlled can be detected during AT, thus the error channel is detected more than 2 hours before the AT error
occurs. The AT continues even if an alert is output for the loop disconnection detection. For details on the loop
disconnection detection function, refer to the following.
●
This function is enabled even when the peak current suppression function or the simultaneous temperature rise function
is used.
●
The loop disconnection detection dead band setting is disabled for loop disconnection detection during AT. (The dead
band is not set.)
(1) Conditions to start the during AT loop disconnection detection function
• Enable (1) is set to During AT loop disconnection detection function enable/disable setting (address: 1E7H).
• A value other than 0 is set to CH
Loop disconnection detection judgment time (address: 116H, 146H,
176H, 1A6H).
• The standard control is set for the control mode. (The function can be used for CH3 or CH4 where the mix
control is set.)
The during AT loop disconnection detection function does not operate if the above conditions are not met. An
error or alarm does not occur even though the conditions are not met.
(2) Setting method
1.
Set "Method selection" to "Param write" of the control mode to be used.
"CC IE Field Configuration" window
Select the temperature control module from "List of
stations"
[CC IE Field Configuration]
[Online]
[Parameter Processing of Slave Station]
2.
Set "CH
Loop disconnection detection judgment time"
*1
.
*1
It takes time before the temperature starts rising due to the dead time of the controlled object. Consider the dead time of
each object and set the value.
3.
Set "1: Enable" to "CH
AT loop disconnection detection function enable_disable setting".
4.
Turn off and on CH
Auto tuning instruction (RY20 to RY23).
Remark
●
Setting example for the control to rise the temperature by 200
for 40 minutes
It takes approx. 24 seconds to rise the temperature by 2
. It also takes time before the temperature starts rising due to
the dead time of the controlled object. Consider the dead time of the object and set the value. Therefore, when assuming
the dead time of the controlled object is 6 seconds, set 30 (24 s dead time of the controlled object) to CH
Loop
disconnection detection judgment time (address: 116H, 146H, 176H, 1A6H).
Summary of Contents for NZ2GF2B-60TCRT4
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