YASKAWA VS mini J7 Series Technical Information

YASKAWA General-purpose Inverter Technical Information
Classification Correspondence to Standard/Model
Control Terminal Insulation of VS mini J7 Series
Title
The control terminals of the general-purpose compact inverter VS mini J7 Series are provided only with basic insulation
(protection class I, overvoltage category Ⅱ). In order to meet the CE mark requirements, additional insulation is needed
for the final products. The following describes how to provide additional insulation.
1. Contents of Additional Insulation
① When applied to overvoltage category Ⅱ power supply
The control terminals are of the insulation specifications assuming overvoltage category Ⅱ. When using the
inverter in overvoltage category Ⅱ, the following insulation is needed for the inverter control terminal metallic
parts (conductive parts) and the parts where human bodies contact directly in the final products.
・ Distance in space: 1.5 mm (200-V class inverter, pollution degree 2)
However, the human body contacting face is a conductive material and grounded, additional insulation is not
needed.
・ Creeping distance: 2.4 mm (200-V class inverter, pollution degree 2)
One of which tracking exponent (CTI) of the insulation material consisting the creeping exceeds 100 is needed.
(Example: 175 < CTI < 400 in case of printed boards)
② When applied to overvoltage category Ⅱ
Additional insulation in conformance to overvoltage category Ⅱ is needed to the inverter control terminal metallic parts
(conductive parts) and the parts where human bodies contact directly in the final products.
・ Distance in space: 5.5 mm (200-V class inverter, pollution degree 2)
However, the human body contacting face is a conductive material and grounded, the distance in space of the
required additional insulation is 3 mm.
・ Creeping distance: 2.4 mm (200-V class inverter, pollution degree 2)
The creeping distance is of the same specifications as overvoltage category Ⅱ, a priority is given to the distance
in space to be assured.
Inserting EN or an insulation transformer in accordance with IEC or a surge absorber into the power supply can
make the insulation equivalent to overvoltage category Ⅱ. In this case, additional insulation is the same as item
①. Also the inverter must be applied under the environment of pollution degree 2. The pollution degrees are
defined as shown below.
Pollution
Degree
1 No pollution or only dryness. Non-conductive pollution exists.
Normally, only non-conductive pollution occurs.
2
condensation rarely occurs while an electronics device is not operating.
Becomes conductive by expectable condensation.
3
Conductive pollution or dry non-conductive pollution occurs.
4 For example, conductive dust, rain or snow makes it permanently conductive.
Issued on: March 28, 2002 Modified on:
Definition of Pollution Degrees (Defined by EN50178 Table 2．)
YASKAWA Electric Corporation
J7
Model Document No.
Micro-environment
Primary conductive pollution by
E-K-01-J7-01
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