Mitsubishi Electric NF400-HEW, Instruction Manual

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15
6. MDU Features and Functions
6.1 Features of MDU
6.2 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 (such as 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).
● Some models do not measure or display (transmit) some items. These items and functions will be skipped.
Caution
*1. Refer to “ 6.3 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 and CC-Link communication cannot be installed at the same time.
*4. The CC-Link version is
“ CC-Link Ver. 1.10. ”
During MDU panel installation, a CC-Link 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.
*5. 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].)
*6. Refer to “ 4.1 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
○
○
○
○
○
○
○
(*2)
Fault cause,
Fault current
Long time delay
Short time delay
Instantaneous
Line system 3 φ 3W, 1 φ 3W (applied to three-pole products), 3 φ 4W (applied to four-pole products)
Output
specifications
(*3)
No transmission (standard product)
Electric energy pulse output (option)
CC-Link communication (option) (*4)
MDU control power supply (permissible voltage
range 85% to 110%)
Alarm contact (MDU Breaker main unit option)
(Refer to “ 6.4 Monitoring functions ” ) (*6)
100 to 240 VAC/DC common 12 VA (*5)
PAL, TI