Switching Performance - Three-State Controller; Limit-Contact - Ecolab MULTRONIC Notice Technique

8.4.3

Switching performance - Three-state controller

NOTE
8.5

Limit-Contact

The "limit contact" function is not a control function, but a means of monitoring state deviation.
The alarm message resulting from a too large state deviation is displayed via the relay output
1 (terminals 1 and 2) and is shown on the display as plain text.
The switching points, L- (lower limit) and L+ (upper limit) must be set independently of the
setpoint value of the feedback control (absolute values).
In addition to this, the switching points are assigned an hysteresis characteristic which itself
are independent of the control.
Parameters
Limit contact (L-):
Limit contact (L+):
NOTE
Switch difference (X
NOTE
417101163_Multronic.doc
The performance described above relates to a three-state controller with a pure P action.
The switching of output 1 is also influenced by the controller's PID response.
Lower alarm limit
Upper alarm limit
It is absolutely essential to ensure that L- is adjusted smaller than L+.
): To be adjusted in %.
2Sd
The difference is calculated as a function of the switching
points, L- and L+.
The display will show the type of alarm used. The alarm output can be switched off by
pressing the "ENTER" button or, depending on the setting, can be acknowledged
automatically if the relevant measured value has moved out of the limit area again.
- adjustable as an absolute value
within the measuring range
- adjustable as an absolute value
within the measuring range
- 65 - Rev: 5.07-08