Siemens MICROMASTER Vector MMV110, Руководство по эксплуатации, Страница: 8 / 30

English English 1. OVERVIEW 1. OVERVIEW
G85139-H1751-U529-D1 G85139-H1751-U529-D1
© Siemens plc 1999 © Siemens plc 1999
4/8/99 4/8/99 88
1.2 1.2 Wiring Guidelines Wiring Guidelines to Minimise to Minimise the Effects of the Effects of EMI EMI
The inverters are designed to operate in an industrial environment where a high level of Electro-Magnetic The inverters are designed to operate in an industrial environment where a high level of Electro-Magnetic
Interference (EMI) can be expected. Usually, good installation practices will ensure safe and trouble-free
Interference (EMI) can be expected. Usually, good installation practices will ensure safe and trouble-free
operation. If problems are encountered, the following guidelines may prove useful. In particular, grounding of
operation. If problems are encountered, the following guidelines may prove useful. In particular, grounding of
the system at the inverter, as described below, may prove effective. Figures 1.2.1-1.2.3 illustrate how an RFI
the system at the inverter, as described below, may prove effective. Figures 1.2.1-1.2.3 illustrate how an RFI
suppression filter should be installed and connected to the MICROMASTER Vector.
suppression filter should be installed and connected to the MICROMASTER Vector.
(1) (1) Ens Ensure t ure that hat all e all equi quipme pment in nt in the c the cubi ubicle i cle is wel s well ear l earthe thed usi d using sh ng short ort, thi , thick ea ck earth rthing c ing cabl able con e connec nected t ted to a o a
common star point or busbar. It is particularly important that any control equipment that is connected common star point or busbar. It is particularly important that any control equipment that is connected
to the inverter (such as a PLC) is connected to the same earth or star point as the inverter via a short,
to the inverter (such as a PLC) is connected to the same earth or star point as the inverter via a short,
thick link. Flat conductors (e.g. braids or metal brackets) are preferred as they have lower impedance
thick link. Flat conductors (e.g. braids or metal brackets) are preferred as they have lower impedance
at high frequencies.
at high frequencies.
The return earth from motors controlled by the inverter should be connected directly to the earth The return earth from motors controlled by the inverter should be connected directly to the earth
connection (PE) on the associated inverter.
connection (PE) on the associated inverter.
(2) (2) On On the the MID MIDIMAS IMASTER TER Vec Vector tor, us , use sa e saw-t w-toot ooth wa h washe shers w rs when hen mou mounti nting t ng the i he inve nverte rter an r and en d ensur sure th e that a at a
good electrical connection is made between the heatsink and the panel, removing paint if necessary. good electrical connection is made between the heatsink and the panel, removing paint if necessary.
(3) (3) Whe Wherev rever po er possi ssible ble, use , use scr screen eened l ed lead eads for s for con connec nectio tions t ns to the o the con contro trol ci l circu rcuitr itry. Te y. Termi rminat nate the e the end ends of s of
the cable neatly, ensuring that unscreened wires are as short as possible. Use cable glands whenever the cable neatly, ensuring that unscreened wires are as short as possible. Use cable glands whenever
possible.
possible.
(4) (4) Sep Separa arate t te the c he cont ontrol rol cab cables les fro from th m the po e power wer con connec nectio tions a ns as mu s much a ch as po s possi ssible ble, us , using ing sep separat arate tr e trunk unking ing,,
etc. If control and power cables cross, arrange the cables so that they cross at 90° if possible. etc. If control and power cables cross, arrange the cables so that they cross at 90° if possible.
(5) (5) Ens Ensure ure tha that co t conta ntacto ctors i rs in th n the cu e cubic bicle a le are s re supp uppres ressed sed, ei , eithe ther wi r with R th R-C s -C supp uppres ressor sors fo s for AC r AC con contac tactors tors
or ‘flywheel’ diodes for DC contactors, or ‘flywheel’ diodes for DC contactors, fitted to the coils fitted to the coils . Varistor suppressors are also effective. This . Varistor suppressors are also effective. This
is particularly important if the contactors are controlled from the relay on the inverter. is particularly important if the contactors are controlled from the relay on the inverter.
(6) (6) Use Use scr screen eened o ed or ar r armour moured c ed cable ables fo s for th r the mo e motor c tor conn onnect ection ions an s and gro d ground und the the scr screen een at b at both oth end ends vi s via a
the cable glands. the cable glands.
(7) (7) If If the the drive drive is is to to be be operated operated in in an an Electro-magnetic Electro-magnetic noise-sensitive noise-sensitive environment, environment, the the RFI RFI filter filter should should
be used to reduce the conducted and radiated interference from the inverter. For optimum be used to reduce the conducted and radiated interference from the inverter. For optimum
performance, there should be a good conductive bond between filter and metal mounting plate.
performance, there should be a good conductive bond between filter and metal mounting plate.
(8) (8) For For Frame Frame Size Size A A units units (Fig.1.2.1), (Fig.1.2.1), the the flat flat earth earth braid braid strap, strap, supplied supplied with with the the unit, unit, should should be be fitted fitted to to
minimise emissions. minimise emissions.