2-14
VersaMax® Modules, Power Supplies, and Carriers User's Manual – March 2003
GFK-1504K
2
Installing Additional Suppression
For agency compliance, external MOV suppression is required from both the positive and
negative input to frame ground or at the power line input of a system enclosure (see
below). The axial-leaded ZA series of MOVs from Harris is often used. The 20mm size,
model V36ZA80 rated at 160 joules is sufficient for both supply types. The MOV should
be able to handle most line transients. Measurement of actual transients may be required in
extreme cases to decide what MOV is best.
Installing Suppression at the Power Supply
Typical power and ground connections are shown below.
DC: +
or
AC: H
DC: -
or
AC: N
Installing Suppression for Devices in an Enclosure
For a group of devices installed in an enclosure, MOVs can be installed at the point where
the power lines enter the enclosure. Ideally, MOVs should be used at each cabinet in the
system for maximum protection. The following illustration shows suppression on both
power lines and a communications bus entering an enclosure.
Enclosure
Power
to
Modules
Short Length of
Communications
Bus Cable
Periodic Inspection and Replacement of MOVs
MOVs do a good job of absorbing transients on communications, control, and power lines,
provided the total energy of those transients does not exceed the rating of the device.
However, if the energy of the transient exceeds the rating of the device, the MOV may be
either damaged or destroyed.
This failure may not be visibly or electrically evident.
MOVs
should be regularly inspected for signs of damage to assure continued protection against
transients. For some applications, periodic replacement of critical MOVs is recommended,
even if they do not show signs of damage.
PDFsupply.com
Содержание VersaMax
Страница 3: ...PD Fsupply com ...
Страница 27: ...1 20 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 1 PD Fsupply com ...
Страница 79: ...3 14 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 3 PD Fsupply com ...
Страница 123: ...5 22 VersaMax Modules Power Supplies and Carriers User s Manual February 2003 GFK 1504K 5 PD Fsupply com ...
Страница 139: ...6 16 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 6 PD Fsupply com ...
Страница 243: ...8 48 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 8 PD Fsupply com ...
Страница 297: ...9 54 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 9 PD Fsupply com ...
Страница 345: ...10 48 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 10 PD Fsupply com ...
Страница 451: ...13 28 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 13 PD Fsupply com ...
Страница 471: ...14 20 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K 14 PD Fsupply com ...
Страница 487: ...A 12 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K A PD Fsupply com ...
Страница 489: ...B 2 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K B PD Fsupply com ...
Страница 495: ...C 6 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K C PD Fsupply com ...
Страница 499: ...D 4 VersaMax Modules Power Supplies and Carriers User s Manual March 2003 GFK 1504K D PD Fsupply com ...