Programmable DC Power Supply User’s Guide
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to its closed circle system. When capacitance is large enough, the phase lag is easy to
cause the shock to power supply itself, to avoid this, the capacitance should be limited
within 22000μF.
Once the OVP function enabled, the one-way thyristor serves as discharge component in
over voltage protection circuit, the triggering of OVP will cause the thyristor breakover
and release the stored energy in load capacitor. Once the total capacitance released from
load and power supply internal over the support ability of thyristor, the component
probably be damaged, to avoid this, the maximum capacitance should be limited within
10000μF.
For operator using of over capacitance load and cause the damage to thyristor,
the maintenance is chargeable according to actual condition.
2.6.2 When load is storage battery
The diode connected in anti-parallel at output terminal of power supply could support
15A current at most. Also the one-way thyristor serves as the discharge component in over
voltage protection circuit at output terminal. If the voltage of OVP set lower than battery
and OVP is enabled, the thyristor is probably to breakover and cause the huge short
current to burn out the mainboard. So to protect the power supply and battery, user should
connect one diode to prevent the contra flow current when you select storage battery as
load. The capacitance of diode should match with the max output current, or else it will
cause the diode over heat and burn out. Also do not make the reverse connection to
battery to avoid the damage to diode and current sampling resistance.
For the damage of power supply caused by user wrong operation, the maintenance is
chargeable.
2.7 Attention to operation
2.7.1 The using of OVP function
The function can be enabled or disabled as user demand, the value of which is also can be
set. The wrong setting may cause the protection not work and output not normal. So user
should set over voltage protection parameter according to actual condition.
OVP circuit makes the direct measurement to the voltage of output terminals internally
without S+ and S- terminals, if user make mistake to connect them, the monitoring
voltage probably get wrong, which is not so accurate (a little higher). So considering the
