Hitachi EH-D6EAN - Page 160

Chapter 4 Installation
4 – 6
(6) Output wiring for the output terminal
Item
Relay output
(MV-***DR)
Transistor output
(sink type)
(MV-**DT)
Transistor output
(source type)
（MV-***DTP(S)）
External wiring
FUSE
①
②
④
C2
POW
C1
③
⑤
POW
C0
0
Surge killer
FUSE
①
②
④
C2
POW
C1
③
⑤
POW
C0
0
Diode
Diode
FUSE
NC
③
⑤
C
POW
②
④
V
POW
①
0
Diode
FUSE
NC
③
⑤
C
POW
②
④
V
POW
①
0
Figure 4.6 Output wiring
(a) Wiring for the relay output module
1] Life of relay contact
Life curve of relay contact
500
100
10
1
0.1
0.2
5
50
20
10
1
0.5
1000
0.3
3
2
30 V DC τ=7ms
250 V AC cosφ=0.4
30 V DC/250 V AC R load
Switching life (10,000 times)
Shut-off current (A)
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
40/64 points expansion unit
16 points expansion unit
500
100
10
1
0.1
0.2
5
50
20
10
1
0.5
1000
0.3
3
2
30 V DC/250 V AC R load
250 V AC cosφ=0.4
30 V DC τ=7ms
Switching life (10,000 times)
Shut-off current (A)
Below: other than listed above
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.