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TDK-Lambda
EZA11K series
Quick Manual / Practical(I)
1) Explanation of terms of EZA
In EZA, terms unfamiliar with other power supplies are used in instruction manual etc. I will
explain the main ones below.
①
CV: Constant Voltage. In the case of EZA, control to make the voltage on the high-voltage
side or the low-voltage side of EZA constant is called CV control.
②
CC: Constant Current. When the output current reaches a preset current, EZA control the
voltage so that it does not exceed that current. This is called CC control. If it does not reach that
current, EZA performs CV control.
③
Automatic CV mode : The operation of comparing the preset target voltage (parameter) with
the actual voltage, EZA itself judging and switching the direction of charging / discharging is
called automatic CV mode.
④
Manual CV mode: In contrast to the above, EZA switches direction of charging / discharging
by receiving instructions from a personal computer, PLC, etc. is called manual CV mode.
⑤
Generation: In the case of EZA, charging from the (power) grid side (high voltage side,
HVDC side) to the battery side (low voltage side, LVDC side) is called generation or power
running. Since the bi-directional DCDC converter has been put to practical use in railroads etc.,
it is sometimes called “power running” or “generation” to supply power to the motor side from
the power grid side.
⑥
Regeneration: This is called electric power conversion in the opposite direction of “power
running”. In the case of EZA, discharging from the battery side to the grid side is called
regeneration.
⑦
Droop control: Controlling to lower the output voltage in proportion to the magnitude of the
output current is called droop control. With these characteristics, you can expect the effect of
aligning the output currents between the EZAs when performing parallel operation. In EZA, the
rate of voltage drop with respect to current is called the Droop Ratio and can be set as a
parameter.
⑧
Shutdown: EZA outputs a heavy alarm signal, stops the main circuit, stops the output and
enters the standby state is called Shutdown.
⑨
Heavy alarm: EZA has its own function to protect EZA itself or peripheral equipment. When
the protection function is activated, the EZA outputs an alarm signal, stops the main circuit, and
enters the standby state. When the protection function works, if it seems that worker's
confirmation work is necessary before releasing, EZA will output Heavy alarm signal. With
heavy alarm, the red LED on the front panel is lit, EZA is on the front panel, the pin 1 of the CN
is open to the SG, and the standby state is entered.
When a Heavy alarm signal is output, in order to reactivate, it is necessary to input the start
signal after clearing the heavy alarm signal by inputting the reset signal from the outside, except
for the cause of the occurrence of the alarm Is required. Reset can be done by one of the
