Planning the electrical installation
38
Protecting the relay output contacts and attenuating disturbances in case
of inductive loads
Inductive loads (relays, contactors, motors) cause voltage transients when switched
off.
The relay contacts on the RMIO board are protected with varistors (250 V) against
overvoltage peaks. In spite of this, it is highly recommended to equip inductive loads
with noise attenuating circuits [varistors, RC filters (AC) or diodes (DC)] in order to
minimize the EMC emission at switch-off. If not suppressed, the disturbances may
connect capacitively or inductively to other conductors in the control cable and form
a risk of malfunction in other parts of the system.
Install the protective component as close to the inductive load as possible. Do not
install protective components at the RMIO board terminal block.
24 VDC
230 VAC
X25
1
RO1
2
RO1
3
RO1
X26
1
RO2
2
RO2
3
RO2
X27
1
RO3
2
RO3
3
RO3
Relay outputs
RMIO
230 VAC
Diode
Varistor
RC filter
Summary of Contents for ACS800-02
Page 1: ...ACS800 Hardware Manual ACS800 02 Drives 45 to 500 kW ACS800 U2 Drives 60 to 600 HP ...
Page 4: ......
Page 10: ...Safety instructions 10 ...
Page 20: ...About this manual 20 ...
Page 26: ...The ACS800 02 U2 26 ...
Page 42: ...Planning the electrical installation 42 ...
Page 76: ...Installation checklist 76 ...
Page 106: ...Technical data 106 ...
Page 108: ...Dimensional drawings 108 Frame size R7 US gland conduit plate 64579746 H ...
Page 109: ...Dimensional drawings 109 Frame size R8 3AFE 64564161 D US gland conduit plate ...
Page 110: ...Dimensional drawings 110 Frame size R7 with enclosure extension bottom entry 64625942 1 2 B ...
Page 111: ...Dimensional drawings 111 64625942 2 2 C ...
Page 112: ...Dimensional drawings 112 Frame size R7 with enclosure extension top entry 64626264 1 2 C ...
Page 113: ...Dimensional drawings 113 64626264 2 2 C ...
Page 115: ...Dimensional drawings 115 3AFE 64626388 2 2 B ...
Page 116: ...Dimensional drawings 116 Frame size R8 with enclosure extension top entry 3AFE 64626370 1 2 C ...
Page 117: ...Dimensional drawings 117 3AFE 64626370 2 2 C ...
Page 118: ...Dimensional drawings 118 ...
Page 127: ......