Display Method For Protection Characteristic Setting Values; Protection Characteristic Setting And Setting Method For 250 A Frame - Mitsubishi Electric MDU-BN Instruction Manual

7.1.1 Display method for protection characteristic setting values

• Select PROTECT from the main menu screen and press ENTER to switch to the protection characteristics selection screen.
• Switches through LTD ⇔ STD/INST ⇔ ER ⇔ LTD....
* Protection characteristics cannot be set (changed). Use the setting dials on the MDU Breaker main unit to change them.
[Main menu screen]
PROTECT
SETTING
AL_RST
ERASE
INFO
MENU

7.1.1-1 Protection characteristic setting and setting method for 250 A frame

• The setting current from the measurement display unit can not be changed for current setting (Ir) and instantaneous tripping current (Ii).
Please change with the setting knob on the breaker.
(1) Current setting (Ir) check and long time delay operating time (TL), long time delay lamp characteristics (I
characteristic (NP) setting
• You can check the setting value of current setting (Ir) .
• The long time delay operating time (TL) switches between 12 ⇔ 60 ⇔ 80 ⇔ 100 ⇔ 12 .... Enter to set the setting value.
• The long time delay lamp characteristics （ I
• N pole protection characteristic (NP) setting switches between ON ⇔ OFF ⇔ ON .... Please enter with Enter. (4 poles only)
• On the change permission screen, select " YES " and change the setting with Enter.
• After pressing the Enter button, it returns to the protection characteristics selection screen.
[LTD setting value
display screen]
PROTECT LTD
Ir TL at
200 100 200
［ % ］
［ A ］ ［ S ］
MENU
Ir setting value TL setting value
Set with UP/DOWN
(2) Set short time delay current (Is), short time delay operating time (Ts) and instantaneous tripping current (Ii) confirm
• The short time delay current (Is) changes to 2.0 ⇔ 2.5 ⇔ 3.0 ⇔ 3.5 ⇔ 4.0 ⇔ 5.0 ⇔ 6.0 ⇔ 7.0 ⇔ 8.0 ⇔ 9.0 ⇔ 10 ⇔ 2.0 ....
Enter to set the setting value.
• The short time delay operating time (Ts) switches between 0.1 ⇔ 0.2 ⇔ 0.3 ⇔ 0.1 .... Enter to set the setting value.
• The long time delay lamp characteristics (I
• You can check the setting value of instantaneous tripping current (Ii).
• On the change permission screen, select " YES " and change the setting with Enter.
• After pressing the Enter button, it returns to the protection characteristics selection screen.
[STD/INST setting value
display screen]
PROTECT STD/INST
Is Ts I 2 t
10.0 0.3 ON
OFF
［ ｘ I r ］ ［ S ］
MENU
Is setting value Ts setting value
Set with UP/DOWN Set with UP/DOWN
[Protection characteristics
selection screen]
PROTECT
ENTER
MENU
t ） switches between ON ⇔ OFF ⇔ ON .... Please enter with Enter.
6
PROTECT LTD
ENTER
I 6 t NP
ON ON
OFF OFF
MENU
I t ON/OFF
6
Select with UP/DOWN
t) switches between ON ⇔ OFF ⇔ ON .... Please enter with Enter.
6
PROTECT STD/INST
ENTER
I i
3500
MENU
［ A ］
I t ON/OFF
2
Ii setting value
Change with
UP/DOWN
Select with UP/DOWN
LTD
STD/INST
ENTER
ER
MENU
MENU
ENTER
MENU
MENU
NP ON/OFF
Select with UP/DOWN
ENTER
MENU
MENU
38
To [LTD setting value display screen]
t), N pole protection
6
PROTECT LTD
OK？
NO
YES
MENU
Change NO ⇔ YES
with UP/DOWN
PROTECT STD/INST
OK？
NO
YES
MENU
Change NO ⇔ YES
with UP/DOWN
ENTER
MENU
To [Protection
characteristics
selection screen]
ENTER
MENU
To [Protection
characteristics
selection screen]