|
|
| Line 1: |
Line 1: |
| {{Technical support}}
| |
|
| |
|
|
| |
| The problem with uninterrupted power supply divides in some sections:
| |
|
| |
| 1 UPS functional type
| |
| Online UPS means, that the output-power ist constantly generated from the battery while the battery becomes constantly loaded from
| |
| mains power. This concept ensures uninterrupted output-power even in the moment of mains powerfail.
| |
| Other concepts deliver mainspower and start generation from battery only in case of powerfail. The startup of generation may take some
| |
| (short) time. So the output-power can have dips or other deformations in the moment of powerfail, which could cause the "load" instruments
| |
| to stop working.
| |
|
| |
| Choose a high-quality UPS with "online"-generation.
| |
|
| |
| 2 UPS output voltage:
| |
| The waveform should be sinewave or stepped approximation to sinewave.
| |
| The voltage should meet the Oxy-requirements which are 110 or 230V at 50 or 60 Hz with serie A-D according to the
| |
| setting at the Oxygraph mains input. Serie E and F accept nominal voltages from 100 to 240 V 47 - 63 Hz, due to accepted tolerances
| |
| of +/- 10 % the maximum range covers 90 - 264 V.
| |
|
| |
| For the waveform of any UPS is only "close" to a sinewave its always a good idea to stay securely within these ranges and not to
| |
| explore the boundaries. The type of "rectangle"-output UPS and most cheap UPS come with the risk of interference with the loads
| |
| electronics.
| |
|
| |
| 3 UPS Output maximum current:
| |
| The instruments powered by the UPS draw different currents at startup, at running with full load or in normal operation. The UPS needs
| |
| to limit the current to prevent its internal electronics from damage. This limitation may cause problems with the "load" instruments especially
| |
| at startup when they need to switch on transformers or to load capacitors, thus drawing inrush-currents.
| |
|
| |
| Therefore an UPS with inrush capability is preferable.
| |
|
| |
| 4 UPS Output thermal current:
| |
| The output current will warm up the internal electronics of the UPS, which is designed for a certain maximum of continuous current.
| |
| All "load"-Instruments together may not reach this value during an experiment.
| |
|
| |
| So the rated UPS output continuous current has to be higher then the sum of continuous current of all connected instruments, including
| |
| Oxygraphs, computers, monitors.
| |
|
| |
| 5 UPS power failure buffering time
| |
| The battery of the UPS in normal operation is fully charged by the mains supply, the batteries capacity becomes only relevant in case of
| |
| mains powerfail. From fail on the battery has to deliver all the energy used by the load. The longer an experiment should be continued without
| |
| mains power the bigger batteries must be used.
| |
|
| |
| Calculate more power failure buffering time than you ever plan to use. The battery will loose capacity during lifetime and the convenient use
| |
| will increase the number of "load" Instruments.
| |
|
| |
| Oxygraph power-consumption Serie E, F:
| |
| nominal mains input: 100 - 240 V 47 - 63 Hz
| |
| maximum mains range: 90 - 264 V
| |
| inrush-current: depends on the mains power net impedance, at WGT-Labs we measured maximum 45 A for 5µs. With limited current the
| |
| inrush becomes lower in current but takes more time. We measured 8A for 50 µs.
| |
| maximum current: At ambient temperature 25 °C with Chamber temperature set to 0° the Oxygraph takes full peltier-power. Additionally the
| |
| stirrers and the TIP moving will add to a maximum of 110 W and 0,5 A at 50 Hz.
| |
| normal operation:
| |
| 25 ° C ambient and 37° C chamber lead to app. -11% peltier-power thus consuming 40 W from mains power.
| |
| 25 ° C ambient and 5°C chamber lead to ca. -66% peltier-power thus consuming 75 W from mains power.
| |
|
| |
| I use "load" instrument for all electric equipment connected to the UPS.
| |
|
| |
| Even cheap UPS may work properly.
| |
| Even the most luxury UPS still can cause some complications with certain load-situations.
| |
|
| |
| We can not guarantee functionality of UPS-powering of Oxygraphs.
| |
| If all the above mentioned criteria are carefully attended to we suppose experimental equipement will serve smoothly.
| |
|
| |
|
| |
| {{#set: Technical service=Main unit}}
| |
