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A -48V DC power supply unit is optionally supplied with the ONS 15190. This unit can operate within the range of 100 to 250V AC. Output power is provided through a D-type high power connector on the front of the unit. Over-current and over-voltage protection is provided to prevent damage that might be caused by external loads. See the section "Power Supply Specifications" later in this chapter.
Power supply and system specifications are presented in the following sections:
Replace fuses only with fuses of like value and size.
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Warning There is a high voltage hazard from within the power supply unit. The power supply unit cover should only be removed by an authorized technician. |
The power supply comes packaged with the following items:
After unpacking, verify that all of these items are present. If any items are missing, report this immediately to a support representative.
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Caution Install the power supply unit with at least 2 inches (5 cm) of clearance on both sides to enable free air flow through the ventilation holes of the unit. |
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Warning Connect the power cable to the unit, only after the unit is secured. |
The power supply must be rack-mounted as follows:
Step 2 Determine the location on the rack where the power supply unit is to be installed, taking into account that the height of the unit is 2 RU.
Step 3 At the location of each of the four corner holes where the unit is to be installed, insert a nut from the back of the rack toward the front (so that the bolt can be screwed into the nut from the front of the rack).
Step 4 Lift the power supply unit up to the location of the nuts and screw in the four bolts with the washers placed between the bolt and the power supply panel.
The power supply is presented in the following sections:
The power supply front panel includes a three-pin D-type connector. The connector pin-out follows:
The main On/Off switch is used for turning the power supply unit on and off. When the power switch is turned to On, the unit will power up after a delay of approximately 1 second. Turn the unit off by pressing down on the switch. The time delay for turning off the output voltage is dependent on the output load and may be in the range of a few milliseconds to a few seconds.
The front panel of the power supply includes two indicators:
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Note You do not need to touch the ADJ button on the front panel. |
The AC fuse is rated at 15A/250V slow-blow size 3AG. The recommended replacement fuse is BASSMAN MDA-15.
Power supply specifications are presented in Table 3-1.
| Description | Value |
|---|---|
| Performance |
|
Input line voltage | 85 to 265V AC |
Line frequency | 47 to 65 Hz |
Output voltage | -48V DC at 17.7A |
Output voltage regulation | ±1V overvoltage range, load and temperature |
500mV peak to peak at 17.7 load (ripple and noise measured at 20 MHz bandwidth) | |
| Overload Protection |
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Set point in the range of 17.7 to 20A. The power supply transfers from constant voltage into constant current mode during overload. The short circuit current limit is below 20A. | |
Set point in the range of -56 to -62V DC. A latch circuitry will be activated at overvoltage. Turn on the unit by disconnecting AC power and reapplying it again. | |
| Indication |
|
Green lamp (located within the ON/OFF switch) indicates the unit is powered. | |
Green LED indicates DC output presence. | |
| General |
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Size (h x w x d) | 3.4 x 19 x 11 inches (87 x 483 x 280 mm) |
Power supply cooling is performed with an internal fan that blows air from side to side with a side mounted ventilation hole. | |
5.28 lb (2.4 kg) | |
Operating temperature | 23 to 122°F (-5 to +50°C) |
Storage temperature | -40 to 194°F (-40 to +90°C) |
5 to 95% at 144°F (60°C) |
Power supply problems and solutions follow in Table 3-2.
| Problem | Cause and Remedy |
|---|---|
Power supply does not turn on. No AC indication. | Fuse on front panel may have burnt out. Replace the fuse with an appropriate fuse. (See the section "Main Fuse" in this chapter.) |
No voltage appears at output, and the LED is not on. | Make sure that the power supply is not shorted or exposed to over voltage. Turn off the AC voltage and reapply the AC voltage. |
Posted: Sun May 27 05:07:44 PDT 2001
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