Omron K8AK-VW2 24 VAC/DC Manual page 8

K8AK-VW
Questions and Answers
Q Checking Operation
Overvoltages
Gradually increase the input from 80% of the set value.
The input will equal the operating value when the input
exceeds the set value and the alarm indicator starts flashing.
Operation can be checked by the relay outputs that will start
after the operating time has passed.
Undervoltage
Gradually decrease the input from 120% of the set value and
check the operation using the same method as for
overvoltage.
Example: Overvoltage Operating Mode, Undervoltage Operating
Mode and an Operating Time of 5 s
Note: K8AK-VW@ output relays are normally operative.
Set value
Input voltage
Alarm indicator
Relay output
Connection Diagram
200 VAC
Variable
autotransformer
±
Cycle counter
8
Lit
Flashing
5 s
Input terminals
V
0 to 300 V
A1
Power supply
A2
C 200 V
Q
How to Measure the Operating Time
Overvoltage
Change the input suddenly from 0% to 120% of the set value
and measure the time until the Unit operates.
Undervoltage
Change the input suddenly from 120% to 0% of the set value
and measure the time until the Unit operates.
Q Setting the Pre-alarm Monitoring Mode
Use the DIP switch to set the operating mode pins both to
overvoltage (SW3 ON and SW4 OFF) or both to undervoltage
(SW3 OFF and SW4 ON).
Example: Both Pins Set to Overvoltage
AL1 can be used as the pre-alarm for AL2 by setting a
smaller voltage set value for AL1 than for AL2.