Table 5.10 LV alarm operating conditions
Alarm
Output of alarm
LV
If the output voltage drops below
the rating, the alarm signal is out-
put from LV and LVG terminal.
Note :
1
This becomes unstable
in the event of output
overcurrent (intermit-
tent overcurrent).
2
The alarm signal is not
output for parallel op-
eration that does not
use OR diodes.
Open collector method
Good : Low
(0 - 0.8V, 10mA max)
Fail : High or Open
50V 10mA max
¡
Parallel operation
In case of parallel operation, please make the following process.
1
Before wiring, output voltage should be set to the required
voltage at fi rst to each power supply. Each output voltage dif-
ferences must be less than 0.1V or 1% of the rated output volt-
age, whichever smaller.
2
Please connect each wire refer to Fig.5.10. And please use
same length and same type wire to connect each load line.
3
As variance of output current drew from each power supply is
maximum 15%, the total output current must not exceed the
value determined by the following equation.
The rated
current per unit
=
X
(Number of unit)
X
0.85
Output current in
parallel operation
*
Please confi rm that each output current is within the rated cur-
rent.
-
When the output voltage adjustment is required after wiring, retry
the above process from
1
again.
-
When the number of units in parallel operation increases, input
current increases at the same time. Adequate wiring design for in-
put circuitry is required, such as circuit pattern, wiring and current
capacity for equipment.
-
In parallel operation, the maximum operative number of units is 5.
-
It is not possible to work as master and booster operation.
CB
CB
CB
-S
-S
-S
Load
(+)
(-)
Fig.5.10 Parallel operation condition
-
When the output current is less than 10% of rated output current,
the output voltage fl uctuates occasionally. The minimum current
is different depending on the model and the number of parallel
operation. Please contact us.
-
When output cable is not same length from each power supplies,
output current value will not be balanced at each units. Please
set the cable length as same as possible.
¡
Remote sensing
-
These models have a built-in remote sensing function.
If you do not use the remote sensing function, you can short out
bS and +M and between -S and -M on CN1.
When the power supplies are shipped from a factory, they come
with a dedicated harness (H-SN-31) being mounted on CN1. If
you do not use the remote sensing function, you can use the
power supplies as they are.
-
Please see Fig.5.10 if you do not use the remote sensing function.
Please see Fig.5.11 if you use the remote sensing function.
-
When you use the remote sensing function, please wire from +S
and -S on CN1. Harnesses are available for your purchase.
Please contact us for details.
When you use the remote sensing, please note the followings.
1
Wire carefully. When a connection of a load line becomes loose
(due to such factors as loose screw), the load current flows to
the sensing line and internal circuits of the power supply may be
damaged.
2
Use a suffi ciently thick wire to connect between the power supply
and the load and keep the line drop at 0.3V or below.
3
If the sensing line is long, connect C1 and R1.
4
Use a twisted pair wire or a shielded wire as the sensing line.
5
Do not draw the output current from +M, -M, +S or -S.
6
When the remote sensing function is used, the output voltage of
the power supply may show an oscillating waveform or the output
voltage may dramatically fl uctuate because of an impedance of
wiring and load conditions.
Please check and evaluate carefully before using the remote
sensing function.
If the output voltage becomes unstable, we suggest you to try the
followings.
-
Remove the remote sensing line on the minus side and short
out between -S and -M.
- Connect C1, R1 and R2.
Please contact us for details.
AC-DC Power Supplies Enclosed type
Instruction Manual
PLA-19
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