17
SANKEN ELECTRIC CO., LTD.
December
201
6
PAN40004-001E
-02
Input Voltage Range, Harmonic Current, and
Inrush Current
Input voltage range
The input voltage range of a base power unit is 85 to
264
VAC.
If other than specified input voltages are applied, it could cause
the products to fail to operate within the specifications and/or
cause permanent failure of the products.
Harmonic current
A harmonic current suppression circuit (active filter) is incorpo-
rated into each base power unit, and harmonic current is sup-
pressed in all load conditions from no load to full load. The input
voltage range at which the harmonic current suppression circuit
activates is between 85 and 264 VAC.
Inrush current
If a switch is used for controlling input, be sure to select a switch
that can withstand the expected inrush current. If the AC sup-
ply is being switched off and on again, before reapplying power
wait until the internal cooling fan has stopped moving, otherwise
a large current could flow after release of the inrush preventive
circuit.
Protection Functions
Overcurrent protection (OCP)
Each DC module has an isolated overcurrent protection circuit
incorporated into it. When OCP is activated, it shuts down the
respective DC module. If output is stopped due to an overcurrent
condition, be sure to evaluate the load condition and remove the
causes of overcurrent before reapply AC either by remote on/off
or by input of the base power unit.
!
CAUTION: OCP does not necessarily
guarantee complete protection against any
short in the output circuit. Be sure not to short
the output when using the products.
!
CAUTION: Regardless of the OCP range, be
sure not to exceed total rated output current
range or rated output power of the products.
Overvoltage protection (OVP)
Each DC module has an isolated overvoltage protection circuit
incorporated into it. When OVP is activated, it shuts down all
output. If output is stopped due to an overvoltage condition, be
sure to shut off the input and delay reapplying the AC supply
until more than 30 seconds after removal of the causes of the
overvoltage condition.
Thermal shutdown protection
Each base power unit has a thermal shutdown protection circuit
incorporated. The circuit is activated when the following abnor-
malities occur:
• When the airflow volume of the internal fan is lowered and/or
stopped, the internal temperature rises.
• When the base poser unit is used for a long time in conditions
exceeding the total rated power.
• When the base power unit is used in an ambient temperature
exceeding specified temperature in the specifications.
When thermal shutdown is activated, it shuts down all output.
Be sure to shut off the AC supply and remove the causes of the
overheating, as well as delay long enough for the products to cool
to normal temperatures, before reapplying the AC supply. If the
application requires that the product be used continuously, be
sure to apply thorough investigation of the causes and counter-
measures for overheating before using the product.
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