2) Wiring of CT
(1) Clamp the CT to the ground wire that measures the surge current
(There is no polarity for the CT installation).
(2) Makes sure the CT stoper is engaged properly.
(3) Secure the CT with a tie wrap, for example.
(4) Do not secure the CT by wrapping the ground wire.
Operation
1) When a surge current (200A and above) flows in the ground wire, the “actuation count” is increased.
2) When the count exceeds “99”, the counter starts counting from “00” again.
3) There is no display reset (0 reset) function for the “actuation count”.
4) The “contact terminals” switch when the count is incremented.
Maintenance and Inspection
1) Operation Check
When DC 24V (DC 23V ~ DC 25V) is applied to the “test terminals”, the “actuation count” is
increased by 1, and the “contact terminals” are switched. (Note the polarity of the test voltage.)
2) Actuation Record
The “record switch” can be used to note the actuation count.
3) The “record switch” has an ascending (UP) and descending (DOWN) button for each of the two digits.
Change the values by pressing the buttons.
Rated voltage/current
AC125V/0.5A, DC30V/2A
Contact movement
a Contact (N.O-COM)…normal: OFF, during count: ON
b Contact (N.C-COM)…normal: ON, during count: OFF
Contact hold time
5 ms
Applicable wire size
Stranded wire…0.2mm
2
~ 1.25mm
2
Solid wire… φ0.4mm ~ φ1.2 mm
Set the “record switch” to the
display on the “actuation
count” during maintenance.
During a subsequent maintenance, the increase in the
count from the previous maintenance can be seen.
(Example shows two actuations.)
ACTUATION
COUNTER
5
1
1 5
ACTUATION
RECORD
ACTUATION
COUNTER
5
1
1 7
ACTUATION
RECORD
Ground wire
Ground wire
Ground wire
Tie wrap
Stopper
c
b
a
COM
N.C
N.O
Contact terminal circuit
