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Hitachi H20-T User Manual

Hitachi H20-T
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19
Table 14. Selection of starter and contactor for motor (As to main items)
General standard for selection Item
Motor Starter and
contactor
Standard for
selection
Evaluation
Electrical
endurance
Starting current : Is
Load current: I
f
Rated operational
current : I
Is 6I
I
f
I
Electrically allowable
performance for
the rush current and
accident current
which rarely occur.
Rush current and
allowable accident
current: I
R
Making
capacity: Im
Breaking
capacity : Ib
I
R
Im
I
R
Ib
When I
R
> Im, the
contact may be welded.
When I
R
> Ib, breaking
may become impossi-
ble .
Mechanical
endurance
Start / stop
frequency: n
Necessary endurance
times: N
Opening / closing
frequency : m
Mechanical
endurance: M
n m
N M
Overload protection
(thermal overload
relay)
Load current of
motor: I
f
RC value of
thermal overload
relay: I
RC
I
f
= I
RC
(2) Selection
The starters and contactors whose capacity is respectively equal to or more than the capacity (kW) of motor are
selected from the table in Page 8 and 9 of the catalogue.

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Hitachi H20-T Specifications

General IconGeneral
BrandHitachi
ModelH20-T
CategoryController
LanguageEnglish

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