Datasheet

CP20.241, CP20.241-C1, CP20.241-S1,
CP20.241-S2, CP20.241-V1, CP20.242
CP-Series
24V, 20A, 480W, SINGLE PHASE
Sep. 2018 / Rev. 1.0 DS-CP20.241-EN - All parameters are typical values specified at 230Vac, 50Hz input voltage, 24V, 20A output load,
25°C ambient and after a 5 minutes run-in time unless otherwise noted.
www.pulspower.com Phone [phone] Germany
24.6. PARALLEL USE FOR REDUNDANCY
Please note that there are variants with built-in redundancy are available in the CP20 series. Check CP20.241-Rx units.
1+1 Redundancy:
Devices 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 device fails. The simplest way is to put two devices in parallel.
This is called a 1+1 redundancy. In case one device fails, the other one is automatically able to support the load current
without any interruption. It is essential to use a redundancy module to decouple devices from each other. This
prevents that the defective unit becomes a load for the other device and the output voltage cannot be maintained any
more.
1+1 redundancy allows ambient temperatures up to +70°C.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple devices.
Recommendations for building redundant power systems:
- Use separate input fuses for each device.
- Use separate mains systems for each device whenever it is possible.
- Monitor the individual devices. Therefore, use the DC-OK signal of the device.
- It is desirable to set the output voltages of all devices to the same value (± 100mV) or leave it at the factory setting.
- Set the devices into “Parallel Use” mode.
N+1 Redundancy:
Redundant systems for a higher power demand are usually built in a N+1 method. E.g. four power supplies, each rated
for 20A are paralleled to build a 60A redundant system.
Pay attention that leakage current, EMI, inrush current, harmonics will increase when using multiple power supplies.
Keep an installation clearance of 15mm (left / right) between two power supplies and avoid installing the power
supplies on top of each other.
Do not use power supplies in parallel in mounting orientations other than the standard mounting orientation or in
any other condition, where a de-rating of the output current is required.
For N+1 redundancy the ambient temperature is not allowed to exceed +60°C.
Wiring examples for 1+1 and n+1 redundancy:
Fig. 24-5 1+1 Redundant configuration for 20A
load current with a dual redundancy module
Fig. 24-6 N+1 Redundant configuration for 60A load current with multiple power
supplies and redundancy modules
30/32
L
N
PE
20A
Load
Failure
Monitor
I
YR40.241
Redundancy
Module
Input
1
Input
2
Output
+ +
- -
+
-
optional
Power
Supply
24V,20A
DC-
OK
++
--
LNPE
Input
Output
o
o
Power
Supply
24V,20A
DC-
OK
++
--
LNPE
Input
Output
o
o
I
Alternatively, the YR40.242 redundancy module can be
used but has the input and output terminals reversed.
L
N
PE
60A
Load
Failure
Monitor
I
YR40.241
Redundancy
Module
Input
1
Input
2
Output
+ +
- -
+
-
optional
Power
Supply
24V,20A
DC-
OK
++
--
LNPE
Input
Output
o
o
Power
Supply
24V,20A
DC-
OK
++
--
LNPE
Input
Output
o
o
I
YR40.241
Redundancy
Module
Input
1
Input
2
Power
Supply
24V,20A
DC-
OK
++
--
Output
+ +
- -
+
- LNPE
Input
Output
o
o
Power
Supply
24V,20A
DC-
OK
++
--
Output
o
o
LNPE
Input
I I
Alternatively, the YR40.242 redundancy module can be used but has the input and output
terminals reversed.