Hitachi MICRO-EHV+ Applications Manual page 160

Chapter 4 Installation
(6) Output wiring for the output terminal
Relay output
Item
(MV-***DR)
POW
0
POW
C0
Surge killer
POW
0
POW
C0
Diode
(a) Wiring for the relay output module
1] Life of relay contact
1000
500
100
50
20
10
1
1000
500
100
50
20
10
1
2] Surge killer
For inductive load, connect a surge killer (capacitor 0.1F, + resistance of around 100 ) in parallel to the
load. Also, for DC load, connect a flywheel diode.
3] Fuse
A fuse is not built in this module. Install a 6A fuse in the common to prevent the external wiring from
burning out. Install a 2A fuse in each independent contact output circuit.
① ② ④
C2
③ ⑤
C1
POW
POW
FUSE
① ② ④
C2
③ ⑤
C1
FUSE
Figure 4.6 Output wiring
Life curve of relay contact
30 V DC/250 V AC R load
30 V DC τ=7ms
250 V AC cosφ=0.4
0.5
0.1 0.2 0.3 1 2
Shut-off current (A)
30 V DC/250 V AC R load
250 V AC cosφ=0.4
30 V DC τ=7ms
0.1 0.2 0.3 0.5 1 2
Shut-off current (A)
Transistor output
(sink type)
(MV-**DT)
0 ③ ⑤
NC
① ② ④
V
FUSE
Diode
Life of the contact is also in squared reverse
proportion to the current, so be aware that
interrupting rush current or directly driving
the capacitor load will drastically reduce the
life of the relay.
When switching is done with high frequency,
use a transistor output unit.
Above: 20/40/64 points basic unit
3 5 10
Below: other than listed above
3 5 10
4 – 6
Transistor output
(source type)
（MV-***DTP(S)）
POW
0
C NC
POW
① ②
Diode
40/64 points expansion unit
16 points expansion unit
③ ⑤
C
④
V
FUSE