Figure 6-1 The Power Supply Module's Check Terminals - Hitachi HSC-2100 Hardware Manual

④ Condition of cable and wire jackets
Check the outer jackets of all cables and wires for any overheating or other abnormal
condition.
If the outer jacket of a cable or wire is overheated or flaked, it may result in system
malfunction, electric shock hazard, or burnout due to shorting.
⑤ Accumulation of dust and dirt
Check each module to see if dust and dirt is accumulated on it.
Accumulated dust and dirt may cause shorting or burnout in the internal circuit of the module.
It should be removed by vacuum-cleaning. Before using vacuum-cleaning, be sure to power
down your application system.
⑥ Input voltage to power supply
⑦ Voltage of power supply (power supply module and external power sources)
Check each power supply module to see if the input and output voltages to or from it are
within the prescribed ranges.
Also, check each external power source to see if the output voltage from it is within the
prescribed range.
If any such voltage is out of its prescribed range, it may result in system malfunction.
The prescribed ranges of the power supply module are as follows:
Input voltage ranges: for LWV450: 85 to 132 VAC
Output voltage range: 5 VDC ±5% (for all of LWV450, LWV460, and LWV550)
As shown below, the output voltage of each power supply module can be checked across the
check terminals provided on the module.
(For information on the operating power supply voltage and external power source voltage for
I/O modules, refer to the instruction manual on each I/O module.)

Figure 6-1 The Power Supply Module's Check Terminals

for LWV460: 85 to 132 VAC, 80 to 143 VDC
for LWV550: 80 to 143 VDC
LWV450
POWER ON
P.SUPPLY
DC12V
CHECK
DC5V
CHECK
H
AC100V
IN
N
LG
FG
GND
HITACHI
1
2
3
4
5
6
7
8
9
Check
10
terminals
11
12
13
14
15
16
17
18
19
20
6-3
6 MAINTENANCE