Areva MiCOM P225, Technical Manual

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P225/EN FT/B11 User Guide
Page 16/52 MiCOM P225
4.7 The PROCESS menu
A set of measurements relating to operation displayed in the PROCESS menu makes it
possible to monitor the utilisation and state of the motor.
•
"%
I
FULL LOAD" is the percentage ratio of the equivalent thermal current Ieq
absorbed by the motor over the thermal current threshold
I
θ
> (sub-menu 4.10.1 [49]
THERMAL OVERLOAD).
•
The value of the motor thermal state can be reset by the user:
−
either by pressing the
"
key after entering the password
−
or through a logic input set to "
θ
RESET."
−
or through a command received on the RS485 communications port
•
The estimate of the time before a thermal trip “T before TH TRIP” is given under the
following conditions:
−
the thermal alarm threshold
θ
ALARM is reached
−
the equivalent thermal current
I
eq
is greater than the thermal current threshold I
θ
>
−
considering the constant motor overload rate
I
eq
/
I
θ
>.
When the above conditions are not respected, the P225 relay displays the value “****”.
•
The number of authorised starts of the motor “PERMIT START NB” takes into account
all the criteria for limiting or blocking start, that is, the functions: "limitation of the
number of starts", "minimum time between 2 starts", "minimum time between a stop
and a start" and "thermal criterion for blocking a start". When there is no limit to the
number of authorised starts, the relay displays the value “****”.
•
The temperature of each RTD is given in Celsius degrees.
•
"No HOTTEST RTD" indicates the number of the hottest RTD.
•
The indication of the time before a further start is authorised “T before START" is
given when an inhibition on starting is in progress. This indication takes into account
all the criteria for limiting or blocking start, that is, the functions: "limitation of the
number of starts", "minimum time between 2 starts", "minimum time between a stop
and a start" and "thermal criterion for blocking a start".
•
The counter for the number of starts of the motor is incremented at each start. In
contrast, authorisation for the motor to re-accelerate does not increment this counter.
•
The counter for the number of motor operation hours is the sum of hours during which
the motor is running.