DewPro<Superscript>® MMR31 Installation & Operation Manual
27
Chapter 4. Optional Display/User Interface
4.4.5
Error Codes (cont.)
When a value other than
0
is displayed in matrix location
VH 90
, complete the following steps to determine the cause
of the error (a value of
39
is used as an example in the steps below):
1.
Divide the error code displayed in matrix location
VH 90
by 16.
[
Example:
39/16 =
2.4375
]
2.
Determine the
temperature channel
error code by converting the integer portion of the result in step 1 to binary
).
[
Example:
integer portion of 2.4375 = 2 =
0010
binary]
3.
Determine the
moisture channel
error code by multiplying the decimal portion of the result in step 1 by 16 and
then converting the result to binary format (see
[
Example:
16 x decimal portion of 2.4375 = 16 x 0.4375 = 7 =
0111
binary]
4.
Each
“1”
in the binary values calculated in steps 2 and 3 above corresponds to a particular MMR31 error. Identify
these errors by referring to
[
Example:
The
“1”
in the third position of the
temperature channel
error code (see step 2 above) means that the
temperature reading is
> 85°C
. The
“1”
in the second, third and fourth positions of the
moisture channel
error
code (see step 3 above) means that Output 1 is
< 4 mA
and that the moisture unit selected depends on the
temperature.
Table 11:
Temperature Channel 4-Digit Code
Moisture Channel 4-Digit Code
X
X
X
X
X
X
X*
X*
CH2 Output
> 20 mA
CH2 Output
< 4 mA
Temp.
> +85°C
Temp.
< -15°C
CH1 Output
> 20 mA
CH1 Output
< 4 mA
RH
> 100%
RH
< 0%
* If both of these positions are set to
“1”
, the selected moisture unit depends on the temperature.
To further illustrate the process, let’s try one more example. If the
VH 90
matrix location displays an error code of
1
:
Step 1: 1/16 = 0.0625
Step 2:
temperature channel
error code = integer portion of 0.0625 = 0 =
0000
binary
Step 3:
moisture channel
error code = 16 x decimal portion of 0.0625 = 16 x 0.0625 = 1 =
0001
binary
Step 4: There are no temperature errors. The moisture error indicates that RH < 0%