K8AK-VS
8
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 and an Operating Time of 5 s
Note:
K8AK-VS
@
output relays are normally operative.
Connection Diagram
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.
Questions and Answers
Q
Q
Set value
Input voltage
Alarm indicator
Relay output
Flashing
Lit
5 s
200 VAC
0 to 300 V
V
A1
A2
±
C 200 V
Variable
autotransformer
Input terminals
Power supply
Cycle counter
Q
Q
