Mikro MPR500 - Settings and Protection Features

2.2 Auto Scroll
When auto scroll is enabled, the display scrolls between
currents and thermal reading every 10 seconds. To
toggle auto scroll mode, press "UP" and "DOWN"
simultaneously.
2.3 LED Display
a) Run LED
Run LED shows the motor status. Refer to 3.2.1 Motor
Starting.
2
Off
Motor stopping
Blink
Motor starting
On
Motor running
b) Trip LED
Trip LED is normally off. During tripping pickup, where
tripping delay is counting down, Trip LED blinks. Trip
LED on during tripping.
Off
Normal
Blink
Pickup
On
Tripping
c) Thermal LED
Thermal LED blinks when motor current is more than
105% of I
B
. Thermal LED on during thermal overload
tripping, and when thermal capacity is more than 40%
after overload tripping (in which R1 is off, motor not
allowed to start)
Off
Normal
Blink
Thermal overload warning
On Thermal overload tripping
3. Settings and Protection Features
3.1 Setting Display
When the relay is not under tripping condition, pressing
"RESET/MODE" will scroll through various settings.
Function LED showing number or alphabet to indicate
which setting is being view as shown in Figure 3. Table 1
gives description of each setting.
Tip: To quickly jump back to current/thermal display
during setting display, press and hold "RESET/MODE"
for 1.5 second.
1 t
6X
Thermal overload time constant
Current/Thermal Display
3 t>> Short circuit delay time
4 I<< Undercurrent
5 t<< Undercurrent delay time
2 I>> Short circuit
b t
Start
>> Prolonged starting delay time
7 t Unbalance delay time
A I
S
>> Prolonged starting / stalled rotor
8 I
0
>> Earth fault
6 Unbalance
9 t
0
>> Earth fault delay time
Tripping History
c t >> Stalled rotor delay time
d I
B
Base/full load current
E External CT ratio
F1 Auto/Manual Reset
F2 Binary input
F3 Relay 2 function
Stall
Figure 3: Display mode when pressing
Reset/Mode
F4 Phase Sequence/ Phase Loss option
F5 Frequency
Thermal LED will on if after thermal trip and user press reset but thermal % still > 40%
Thermal capacity high, R1 off