Sel 2414 - Example 1

7.7
Date Code 20130214 Instruction Manual SEL-2414 Transformer Monitor
Communications
ASCII Commands
When parameter p is a percentage, the device displays the following message
during the test:
Outputting xx.xx [units] to Analog Output Port for y.y minutes.
Press any key to end test
When parameter p is a ramp function, the device displays the following message
during the test:
Ramping Analog Output at xx.xx [units]/min; full scale in y.y min-
utes.
Press any key to end test
NOTE: 0% = low span, 100% = high
span. For a scaled output from 4–
20 mA, 0 percent is 4 mA and 100
percent is 20 mA.
For either mode of operation (percentage or ramp), when the time expires, or
upon pressing a key, the analog output port returns to normal operation and the
device displays the following message:
Analog Output Port Test Complete
Example 1
The following is an example of the device response to the ANA command in the
percentage mode. For this example, we assume the analog output signal type is
4–20 mA, and we want to test the analog output at 75 percent of rating for
5.5 minutes. To check the device output, calculate the expected mA output as fol-
lows:
To start the test, enter ANA A0301 75 5.5 at the Access Level 2 prompt:
=>>ANA A0301 75 5.5 <Enter>
Outputting 16.00 mA to Analog Output Port for 5.5 minutes.
Press any key to end test
Example 2
The following is an example of the ramp mode when the analog output signal
type is 4–20 mA for a 9.0 minute test.
To check the device output, calculate the current/time (mA/min) output as fol-
lows:
where:
xx.xx
is the calculation of percent of full scale
[units]
is either mA or V, depending on the channel type setting
y.y
is the time in minutes
where:
xx.xx
is the calculation based upon range/time t
[units]
is either mA or V, depending on the channel type setting
y.y
is the time in minutes
Output 20.00 mA 4.00 mA–()
75
100
---------
• 4.00 mA+ 16.00 mA==
Output
20.00 mA 4.00 mA–
9.0 min
---------------------------------------------------
1.78 mA/min==