Mitsubishi Electric NF250-HEV, Инструкция по эксплуатации, Страница: 17 / 64

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4. MDU Features and Functions
4.1 Features of MDU
4.2 Functions of MDU
● The load current, line voltage, harmonic current (fundamental frequency; 3rd, 5th, 7th, 9th, 11th, 13th, 15th, 17th, and 19th order; and total),
electric power, reactive power, electric energy, reactive energy, power factor, and frequency flowing to MDU Breaker can be measured and displayed.
● When MDU Breaker is tripped, the fault cause and fault current are stored in non-volatile memory. This information can be used to identify
fault causes and recover.
● The maximum value of measurement items such as demand current and time electric energy is stored in non-volatile memory, along with when the
maximum value occurred. This information can be used to identify peak energy usage times.
● The LCD backlight color changes from white to red when an alarm (PAL, OVER) or fault occurs, allowing users to notice abnormalities even
from far away.
● Data such as measurement values, maximum values (and maximum value occurrence times), fault causes, fault current, and the alarm
status can be sent over a field network (CC-Link, MODBUS).
● Some models do not measure or display (transmit) some items. These items and functions will be skipped.
Caution
*1. Refer to “4.3 Measurement functions” for details of measurement functions.
*2. Either the latest fault cause or the latest fault current is shown. They are not displayed simultaneously.
*3. Electric energy pulse output, CC-Link communication, and MODBUS communication can not be installed at the same time.
*4. The CC-Link version is “CC-Link Ver. 1.10.”
*5. During MDU panel mounting, a CC-Link/MODBUS cable (part no. FANC-110SBH manufactured by Kuramo Electric Co., LTD.) is used from the
front surface of the MDU to the terminal block on the rear surface.
*6. When the MDU control power supply is turning on, a transitional inrush current will be generated. (Inrush current maximum value 2 A,
energization time 1 ms [240 VAC].)
*7. Refer to “6.1 Contact capacity and combinations for alarm contact output” in “MDU Breaker Instruction Manual for Main Unit” for alarm
contact output combinations.
Measurement
functions
(*1)
Load current I
○
Line voltage V ○
Harmonic current IH ○
Electric power P
○
Reactive power Q ○
Electric energy EP ○
Reactive energy EQ ○
Power factor PF ○
Frequency Hz
○
○
○
○
○
○
○
○
Fault cause,
Fault current
(*2)
Long time delay
Short time delay
Instantaneous
Line system
Output
specifications
(*3)
No transmission (standard product)
Electric energy pulse output (option)
CC-Link communication (option) (*4) (*5)
MODBUS communication (option) (*5)
MDU control power supply (permissible voltage
range 85% to 110%)
Alarm contact (MDU Breaker main unit option)
(Refer to
“
4.4 Monitoring functions
”
) (*7)
100 to 240 VAC/DC common 12 VA (*6)
PAL, TI
1 φ 2W, 3 φ 3W, 1 φ 3W (applied to three-pole products), 3 φ 4W (applied to four-pole products)