M54128 Mitsubishi, M54128 Datasheet - Page 8

• Manufacturer Part Number: M54128
• Description: EARTH LEAKAGE CURRENT DETECTOR
• Manufacturer: Mitsubishi

7. Reset time in reset circuit
8. Application of leakage detection function to time delay
OFF
S
CRT
This circuit is designed as a timer circuit of V
and lo = 10 A. When SCR is ON, the power supply route of the
leakage detection and abnormal voltage detection circuits are
shut off, VL does not drop to 0.7V as shown below and therefore
reset time may become shorter.
Set the reset time somewhat longer in advance.
function
As shown in the figure below, by applying the neutral conductor
open-phase protection function, it is possible to provide the
leakage detection function with time delay function (several
100ms). ln this case, however, the neutraI conductor open-
phase protection function disappears. Pin No. in parentheses
are of L type.
C
pin waveform
pin waveform
0.7V
V
CC
T =
P
SAV
C x (V
(Example 1)
2.4V
0V
I
I
BLI
H
- V
L
)
T
T
TDC
RC1
=
0.33 F x (2.4 - 0.7)
T
RC2
L
= 0.7V, V
10 A
H
= 2.5V
=
55ms
55ms
t = 10 – 20ms
EARTH LEAKAGE CURRENT DETECTOR
MITSUBISHI <CONTROL / DRIVER IC>
V
CC
3.1V
P
SAV
Note. t : time shorter than setting value
(Example 2)
• ln the case of leakage detection :
• ln the case of abnormal voltage detection :
May become 10ms (50Hz) shorter
May become 20ms (50Hz) shorter
I
BLI
M54128L/FP
T
T
TDC
RC1
T
RC2