Mitsubishi Electric MEsoftstart/I00, Users, Installation & Instruction Manual

Page: 46 / 119

46 Precautions for use
Checklist before applying power
The MEsoftstart/I series soft starter is a highly reliable product, but an incorrect peripheral circuit may shorten the product life
or damage the product. Before starting operation, always recheck the following points:
Checkpoint Countermeasure
Refer Checked
The soft starter model is
appropriate for the motor
that will be connected to
it.
If the soft starter model is not appropriate
for the motor that it is connected to, the
starting current may not be enough and the
motor can overheat.
- Consider a larger model soft starter.
- Consider connecting the soft starter inside
delta to the motor.
-
Consider adding an external bypass
contactor (for models without built in
contactor) - this may reduce the thermal
load on the soft starter.
-
Contact your local distributor for
assistance to find the best solution.
Table 1
Table 2
Table 3
Model: MEsoftstart/I03
Continuous
rated
current:
600A
Max.
starting
current:
1440A Normal
duty
Max
starting
current:
750A Heavy
Duty
Table 4Table 4
Table 5
There is adequate space
for air-flow around the soft
starter. If the air-flow is restricted, the soft starter
will overheat and trip.
Paragraph 2.3.3
Terminals are insulated.
Use terminals with insulation sleeves to wire
the power supply and the motor.
Figure 21
The main circuit cable
gauge is adequate.
Use an appropriate cable gauge to suppress
the voltage drop to 2% or less. If the wiring
distance is long between the soft starter and
motor, the voltage drop in the main circuit
will cause the motor torque to decrease.
Local standards
The wiring is correct:
Direct application of power to the motor-
side output terminals (T1, T2, T3) of the soft
starter will damage the soft starter.
Inadvertently connecting the supply lines to
the Bypass terminals will damage the soft
starter
-
Confirm that the line voltage is within the
soft starter’s rated voltage range.
- Confirm that the circuit breaker selected is
adequate for the motor maximum starting
current.
-
Confirm that the fuses that are installed
are according to the specification in Table
7 for the selected soft starter model.
-
Confirm that if an external bypass
contactor is used, the contactor is rated
for the operating current of the motor.
Table 7
Wiring between the supply
lines
(L1, L2, L3), Circuit breaker,
Fuses, soft starter and
motor is correct.
If an external bypass
contactor is used, the
wiring between the bypass
terminals is correct.