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PIANO-Series
22.
A
PPLICATION
N
OTES
PIC480.241C, PIC480.241C-C1
24V, 20A, 480W, S
INGLE
P
HASE
I
NPUT
22.1.
B
ACK
-
FEEDING
L
OADS
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. (Electro Magnetic Force).
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 35Vdc. The absorbing energy can be calculated according to the built-in
large sized output capacitor which is specified in chapter 6.
22.2.
E
XTERNAL
I
NPUT
P
ROTECTION
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 10A B- or 6A C-Characteristic breaker should be used.
22.3.
P
ARALLEL
U
SE TO
I
NCREASE
O
UTPUT
P
OWER
Do not use the power supply in parallel to increase the output power.
22.4.
P
ARALLEL
U
SE FOR
1+1 R
EDUNDANCY
Power supplies can be paralleled for redundancy to gain higher system availability. Redundant systems require a certain amount of extra power to support the load in case one power supply unit fails. The simplest way is to put two power supplies in parallel. This is called a 1+1 redundancy. In case one power supply unit fails, the other one is automatically able to support the load current without any interruption.
Please note: This simple way to build a redundant system does not cover failures such as an internal short circuit in the secondary side of the power supply. In such a case, the defect unit becomes a load for the other power supplies and the output voltage can not be maintained any more. This can only be avoided by utilizing decoupling diodes which are included in the redundancy module
YR40.241.
+ + - -
24-28V
DC-OK
DC-
OK
+
Input
1
+
Input
2
-
YR40.242
Module
+ + - -
24-28V
DC-OK
DC-
OK
Failure
Monitor
PIC480.241C
Power Supply
L N PE
Output
+ -
PIC480.241C
Power Supply
L N PE
Recommendations for building redundant power systems: a) Monitor the individual power supply units. Therefore, use the
DC-OK relay contact of the PIC480.241C power supply. b) Use separate input fuses for each power supply.
I I
24V,20A
Load c) Use separate mains systems for each power supply whenever it is possible.
L
N
PE d) It is desirable to set the output voltages of all units to the same value (± 100mV) or leave it at the factory setting.
Mar. 2021 / Rev. 1.2 DS-PIC480.241C-EN
All parameters are typical values specified at 24V, 20A output, 230Vac input , 25°C ambient and after a 5 minutes run-in time unless otherwise noted. www.pulspower.com Phone +49 89 9278 0 Germany
18/19
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