FPS300.245-049-102
All parameters are specified at 24 V, 12.5 A, 230 Vac, 25 °C ambient and after a 5 minutes run-in time unless otherwise noted.
Apr. 2022 / Rev. 0.2 FPS300-EN
27 / 28
Application Notes
23.1.
Repetitive Pulse Loading
Typically, a load current is not constant and varies over time. This power supply is designed to support loads with a higher
short-term power demand (BonusPower). The short-term duration is hardware controlled by an output power manager and
is available on a repeated basis. If the average load is higher than the sum of all output power, the output voltage will dip.
To avoid this, the following rules must be followed:
a)
The power demand of the pulse must be below 200 of the nominal output power.
b)
The duration of the pulse power must be shorter than the allowed BonusPower time, see chapter 6
c)
The average power should be lower than the nominal output power.
The R.M.S. output current must be below the specified continuous output current. If the R.M.S. current is higher, the unit
may respond with a thermal shut-down after a period of time.
23.2.
External Input Protection
The device is designed, tested and approved for branch circuits up to 20 A (UL) and 32 A (IEC) without additional protection
device. If an external fuse is utilized, do not use circuit breakers smaller than 6 A B- or C-Characteristic to avoid a nuisance
trip.
23.3.
Inductive and Capacitive Loads
The unit is designed to supply any kind of loads, including capacitive and inductive loads. If extreme large capacitors, such
as EDLCs (electric double layer capacitors or “UltraCaps”) with a capacitance larger than 20mF are connected to the output,
the unit might charge the capacitor or the output might trip, chapter 6.
23.4.
Back Feeding Loads
Loads such as decelerating motors and inductors can feed voltage back to the power supply. This feature is also called return
voltage immunity or resistance against Back- E.M.F. (
E
lectro
M
agnetic
F
orce).
This power supply is resistant and does not show malfunctioning when a load feeds back voltage to the power supply. It
does not matter whether the power supply is on or off.
