6.2
Connecting the power supply
Refer to Section 2, Safety (or Section 3, Sicherheit, or Section 4, Sécurité) for
important electrical safety information.
Choose a power supply unit that limits its output current by design, by
setting the current limit on the supply (if this feature exists) or use fuses. The
external power supply should be able to supply at least 6A.
Remember to de-rate the fuse when mounted in an enclosure, as the temperature
will be higher than ambient.
The use of a regulated power supply with 100% short-circuit protection is
recommended and an external disconnector is required. However, if a non-
regulated power supply is used, then the maximum ripple voltage of this
power supply must not exceed 10% of the actual DC value.
Additional surge protection is required if transient interference of greater
than ± 60V on the power supply lines is expected.
6.2.1
VTS power supply handling
The VTS analyses its power supply in order to decide whether it is operating
from a 12V supply or a 24V supply and applies internal self- protection
mechanisms accordingly. At initial power-up, the VTS assumes that it is
operating from a 12V power supply. However, if the incoming supply voltage
rises above 18V, it will assume that it is operating from a 24V supply.
If the VTS has deduced that it is operating from a 12V supply and the supply
voltage drops below 10V, an
Error 72
will be generated and the VTS will turn
itself off until the supply recovers to above 10V again. If the VTS has deduced
that it is operating from a 24V supply and the supply voltage drops below
18V, an
Error 73
will be generated and the VTS will turn itself off until the
supply recovers to above 18V again.
Note:
The performance may have already reduced by the time the supply voltage
drops to the 10/18V threshold. See Section 11.1, Ratings and restrictions for the
maximum and minimum allowable voltage supplies for full performance.
The power supply voltage decision made by the VTS is not stored
permanently in memory, so every time the VTS is powered-up, it will
decide what its power supply voltage is.
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Summary of Contents for PULSESTAR VTS Series
Page 1: ...PULSESTAR VTS Installation Guide Issue 004...
Page 2: ...For your notes...
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