Delta AH500 Manual page 166

AH 5 00 Mo d u le Ma n ua l
4. Average
Digital values are averaged. The number by which the sum of several digital values is divided is
between 1 and 100. The sampled values are taken as a queue, and the length of the queue is N.
Each time a new sampled value is put at the end of the queue, an original value at the start of the
queue is removed. The N values are averaged so that the periodic noise is suppressed.
5. Disconnection detection
If a channel is enabled, the module will check whether a sensor is disconnected. If an input circuit
is an open circuit, the module will give an alarm. Please refer to description below for more
information.
A four-wire Pt100 sensor is taken for instance.
810: Maximum temperature
-190: Minimum temperature
n: 0~7
Disconnection
On+ -190 (Minimum temperature)
On- -190 (Minimum temperature)
In+ 810 (Maximum temperature)
In- -190 (Minimum temperature) On+ , On- , In+ -190 (Minimum temperature)
On+ , In+ 810 (Maximum temperature) On+ , On- , In- -190 (Minimum temperature)
On+ , In- -190 (Minimum temperature) On+ , In+ , In- -190 (Minimum temperature)
On+ , On- -190 (Minimum temperature) On- , In+ , In- -190 (Minimum temperature)
A three-wire Pt100 sensor is taken for instance.
810: Maximum temperature
-190: Minimum temperature
n: 0~7
Disconnection
On+ -190 (Minimum temperature)
On- -190 (Minimum temperature)
In+ 810 (Maximum temperature)
In- 810 (Maximum temperature) On+ , On- , In+ 810 (Maximum temperature)
On+ , In+ 810 (Maximum temperature) On+ , On- , In- 810 (Maximum temperature)
On+ , In- 810 (Maximum temperature) On+ , In+ , In- 810 (Maximum temperature)
On+ , On- -190 (Minimum temperature) On- , In+ , In- 810 (Maximum temperature)
6. Channel detection
If an input signal exceeds a range of inputs which can be received by hardware, an error
message appears. Please refer to section 5.2.1 for more information.
5 - 4 4
Result Disconnection
On- , In+
On- , In-
In+ , In-
Result Disconnection
On- , In+
On- , In-
In+ , In-
Result
-190 (Minimum temperature)
-190 (Minimum temperature)
-190 (Minimum temperature)
Result
810 (Maximum temperature)
-190 (Minimum temperature)
810 (Maximum temperature)