SQLC-214-097
15
● In case of installing ZCT to ground wire by leakage monitor.
W (1φ3W, N-phase grounding)
W (3φ3W, V-phase grounding)
L
ZCT
K
4
3
N
LOAD
VU
U
● Caution on connection
(1) Mount the terminal cover without fail for safety after the end of connections.
(2) Separate the input wiring and output wiring from each other without fail, and take a preventive measure against
malfunction due to external noises.
(3) Connect the grounding terminal E (No. 7 terminal) to the ground without fail for enhancing the shield effect.
Keep the grounding resistance between the grounding terminal and the ground to be lower than 100Ω.
(4) Keep a distance of more than 30cm between this unit and the circuit breaker as well as between this unit and the
relay contact signal line.
(5) No protection is necessary for this unit even if the transmission line may be affected by an induced lightning
surge or the like when transmitting an analog output to the receiver. Mount an about 500V arrester or the like
between the line surge protector and the ground as well as between the transmission line and the ground on the
receiver side for the purpose of protecting the devices on the receiver side.
(6) It is recommended to mount a surge killer outside when connecting an inductive load to the pulse output and alarm
output. If no surge killer is mounted, the contact life may shorten.
(7) Please do not earth the output terminal of ZCT.
(8) Please shorten wiring for this product from secondary of ZCT as much as possible. And, in case secondary wiring
becomes close to other large current circuits, please use shielding wire.
(9) In case it measures a leakage current Igr, it is necessary to measure correctly the phase angle of a voltage input
and a zero phase-current input. Wiring of ZCT (primary, secondary) and wiring for this product should check
schematics.
<Caution> When doing Igr measurement by a leakage monitor,
please be careful about polarity of ZCT.
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