20
21
-1
1
36
Power Supply PS1000-A6-48.5
Application Notes
Figure 25.3 16A peak current for 12ms , typ. (3x the nominal current)
25.2
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.
The maximum allowed feed-back-voltage is 63Vdc. The maximum allowed feed-back peak
current is 21A. Higher currents can temporarily shut-down the output voltage. The absorbing
energy can be calculated according to the built-in large sized output capacitor which is
specified in chapter 8.
25.3
External Input Protection
The unit is tested and approved for branch circuits up to 30A (UL) and 32A (IEC).
An external protection is only required if the supplying branch has an ampacity greater
than this. Check also local codes and local requirements. In some countries local regulations
might apply.
If an external fuse is necessary or utilized, minimum requirements need to be considered
to avoid nuisance tripping of the circuit breaker. A minimum value of 6A B- or C-Characteristic
breaker should be used.
10ms/DIV
Output Voltage
Output Current
0A
12ms
16A
48V
19.3V
Note
The DC-OK relay triggers when the voltage dips more than 10% for longer than 1ms.
Peak current voltage
dips
Typically from 48V to 30.5V
At 10.8A for 50ms and resistive load
Typically from 48V to 30.0V
At 27A for 2ms and resistive load
Typically from 48V to 25.3V
At 27A for 5ms and resistive load
