
Planning the electrical installation 43
Protecting the contacts of relay outputs
Inductive loads (relays, contactors and motors) cause voltage transients when switched
off.
When you connect inductive loads to the customer I/O, equip the loads with noise
attenuating circuits (varistors, RC filters [AC] or diodes [DC]) to minimize the EMC
emissions at switch-off. If they are not suppressed, the disturbances can connect
capacitively or inductively to the other conductors in the control cable and cause a
malfunction.
Install the protective component as close to the inductive load as possible. Do not install
protective components at the relay outputs.
1) Relay outputs, 2) varistor, 3) RC filter, 4) diode
230 V AC
230 V AC
+24 V DC
-
1
2
3
4
Содержание PVS800-57B
Страница 1: ... ABB SOLAR INVERTERS PVS800 57B central inverters Hardware manual ...
Страница 4: ......
Страница 8: ...8 ...
Страница 16: ...16 Safety instructions ...
Страница 30: ...30 Operation principle and hardware description ...
Страница 32: ...32 Planning the mechanical installation ...
Страница 62: ...62 Dimension drawings Cabinet dimensions ...
Страница 63: ...Dimension drawings 63 ...
Страница 64: ...64 Dimension drawings Cabinet attachment points ...
Страница 65: ...Dimension drawings 65 ...
Страница 66: ...66 Dimension drawings AC and DC cabling lead throughs ...
Страница 67: ...Dimension drawings 67 ...
Страница 68: ...68 Dimension drawings AC cabling ...
Страница 69: ...Dimension drawings 69 ...
Страница 70: ...70 Dimension drawings DC cabling ...
Страница 71: ...Dimension drawings 71 ...
Страница 72: ...72 Dimension drawings ...