Operations - Mitsubishi Electric FR-K-400-U Instruction Manual

10 -150 rec.
110
secor~ds
increment)
0.2 - 3 sec.
10.2 second increment1
(4) Both the acceleration and deceleration times are set at 5 seconds at shipping.
5-2-4 Sening of electronic thermal relay (set b y setting dial)
(1) For setting of the electronic thermal relay, the rated output current of the inverter is deter-
mined at 100%. (The setting range i s 50 t o loo%.)
(2) The electronic thermal relay is
s e t
at 100% at shipping.
(3) Set the setting dial for the electronic thermal relay by calculating the percentage according
t o the following equation.
0
When
s
single motor is operated by the inverter, the following equation applies:
Rated current of the motor ( A )
Set scale (%)
=
-
x 100
Rated output currentof the inverter ( A )
I f the value of the
s e t
scale (%) exceeds 100%. then s e t the setting dial t o 100%.
Rated output current i s shown i n the name plate.
(4) I f a multipole motor with eight or more poles, an special-purpose motor, or plural motors
are being
operated, the built-in electronic thermal relay will n o t affort sufficient protection
so a thermal overload relay should be added t o the inverter's output circuit.
I f such cases turn the electronic thermal relay setting dial (TH) as far as it will go i n the
clockwise direction.
5-3 Operations
When the preparations have been completed, begin inverter operations in the following procedure:
(1) First close the MCCB, then the magnetic contactor (MS) by pushbutton. The power pilot lamp
on the inverter panel should light in yellow. The motor will not yet rotate in this state. Touch the
motor with your hand t o see that there are no buzzing sounds or vibration.
(2) I f there are no zbnormalities, turn the FWD start switch (or REV start switch) on. Gradually turn
the knob of frequency setter clockwise. When the knob is turned t o "3Hz" position, the motor
will start rotating. And turned farther clockwise, the frequency (rotation of the motor) will in-
crease gradually ap to i t s maximum frequency setting (60Hz. 120Hz or 240Hz)
(3) When the frequency setter has been s e t at the desired frequency, and the FWD start switch (or
REV start switch) has been turned on, motor revolutions will increase to the set value within the
time
s e t
by the acceleration time setting dial described above, and then continue t o operate at the
setting frequency. I f the motor does not accelerate smoothly and the A L A R M lamp blinks during
the acceieration or the "ALARM" indication lamp lights up, this is because the acceleration time
has been s e t at too short period i n relation t o the motor load, and the acceleration time should
thus be lengthened.