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NEURN030000_220_A
NEURN030000_220_A
10.4 Capacitor
10.4.1 Capacitor rebuilt
If the frequency inverter hasn’t been used for a long time, before using it please rebuilt the DC bus capacitor according the instruction. The storage time
is counted from delivery.
Time
Operation instruction
Less than 1 year
No need to recharge
Between 1~2 years
Before the first time to use, the frequency inverter must be recharged
for one hour
Between 2~3years
Use adjustable power to charge the frequency inverter:
--25% rated power 30 minutes,
-- 50% rated power 30minutes,
-- 75% rated power 30minutes,
--Last 100% rated power 30minutes,
More than 3 years
Use adjustable power to charge the frequency inverter:
--25% rated power 2hours,
--50% rated power 2 hours,
-- 75% rated power 2hours,
-- Last 100% rated power 2hours.
Instruction of using adjustable power to charge the frequency inverter:
The adjustable power is decided by the frequency inverter input power, for the single phase/3 phase 220v frequency
inverter, we uase 220v AC/2A Regulator. Both single phase and three phase frequency inverter can be charged by single
phase Power Surge(L+ connect R,N connects T) Because it is the same rectifier,so al l the DC bus capacitor will be
charged at the same time.
You should make sure the voltage(380v) of high voltage frequency inverter, because when the capacitor being charged
it almost doesn’t need any current, so small capacitor is enough(2A)
The instruction of using resisitor( incandescent lights) to charge frequency inverters:
When charge the DC bus capacitor of drive system by connecting power directly, then the time should not be less than
60 minutes. The operation should be carried on under the condition of normal temperature and without load, and
moreover ,should be added resistor in the power supply cycle.
380V drive system: use 1K/100W resistor. When the power is less than 380v, 100w incandescent lights is also suitable.
When using incandescent lights, the lights will extinct or become very weak.
Voltage
AC 380V
Inverter
R
S
T
Fig. 10-1: 380V Drive equipment charging circuit example
10.5 Measuring and readings
• If a general instrument is used to measure current, imbalance will exists for the current at the input terminal.
generally, the deviation is not more than 10%, that is normal. If the deviation exceeds 30%, please inform the original
manufacturer to replace rectifier bridge, or check if the deviation of three-phase input voltage is above 5V or not.
• If a general multi-meter is used to measure three-phase output voltage, the reading is not accurate due to the
interference of carrier frequency and it is only for reference.
