Sanken SVCO6, Instruction Manual, Page: 174 / 326

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7-3 Description of Functions
F1702 Electric thermal setting
The current at which the electric thermal begins to work (electric thermal overload setting) is specified as a ratio to the
rated inverter current. Rated current is the base of the ratio.
Code No. Function Name Data Content Setting
Resolution
Factory Presets
F1702 Electric thermal setting
0
：
Inactive
20
-
105%
1% 100
●
When a motor with a small capacity is driven, F1702 should be set to a small value which matches the rated
motor current.(Refer to Example 1)
●
For general-purpose motors, due to low cooling efficiency of the motor in the low speed zone, the electric
thermal works faster as the frequency decreases. When using an inverter-driven motor, current can not be
compensated according to the frequency value. Refer to F1705 (motor types).
●
The electric thermal overload function also works during DC braking.
Note 1: The so-called overload protection caused by thermal works by monitoring the output current of the inverter to
prevent the motor from overloading. It can only be used when one inverter is allocated to each motor. When many
small capacity motors are connected with one inverter, each motor should be equipped with a thermal, and each
motor shall be protected by inputting thermal relay contact to the control terminal
ES (external thermal relay).
Example 1) To drive a 2.2 kW motor using mode A of SVC06-0040:
Set F1702 = (rated current of 2.2 kW motor)/ (rated current in mode A of SVC06-0040: 9.0 A) × 100%
Example 2) When set to F1702=50%:
50% of the rated inverter current specified is equivalent to 100% of the load factor in the electric
thermal function. Accordingly, 75% of the rated inverter current is equivalent to 150% of the load
factor in the electric thermal function.
Reference parameter
F1414 - F1421 (select the input terminals DI1- DI8)
F1705 (Motor type)
Allo
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b
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o
n
tin
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o
u
s cur
re
n
t
Output frequency
W
o
rk
in
g
d
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n
[m
in
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]
F1702=100%
※
Example of mode B
Load factor [%]