MIB
Installation Instructions and Reference Handbook
DEIF A/S
Page 39 of 50
Unbalance factor:
MIB can measure the unbalance factor of three-phase
voltage and current, using the method of sequence vector.
Max./min.: MIB can measure the max. value of a system’s total power,
reactive power and apparent power and the max./min. of the three-phase
voltage and current. The value of the measured data is stored in NV-RAM.
Alarm function
When the measured data value has reached the pre-set alarm limit and the
pre-set alarm time has expired, an alarm will be generated.
Digital output (only MIB 7020)
The digital output (DO) can be used as trigger to light or sound alarming.
An example is given below to describe how the over-limit alarming works.
Example DO1+2 alarm output:
With the following settings, a high-limit alarm will be generated when I1
goes over 1A and the duration is over 15 seconds:
1. Set the mode of DO1 as alarming output, namely the value of DO1 mode
is set to 1.
2. Alarm time set to 15 seconds, 1 digit is 300ms. The setting value of alarm
time is then: 15÷0.3=50.
3. Alarm output item is I1, and then the value must be set to 7.
4. I1 must be higher than 1A, so the alarm function must be set to 1. High
alarm = 1.
5. Setting of alarm limit = 1A (use direct primary values).
Energy pulse output:
The two digital outputs can be used as energy pulse outputs. The output
energy can be selected among all kinds of active and reactive energy terms.
Pulse rate and pulse width can be set to meet the requirements.
Pulse constant is the amount of kWh for each pulse.
Pulse width is the time that a pulse lasts.
When the accumulated energy reaches the pulse rate value, there will be a
pulse on DO.
