Subject: RE: E1881A Power supply current and dynamic current spec's Date: Thu, 10 Jun 1999 09:23:16 -0600 From: Dwight Anderson Hello All; I'll need to review the dynamic current spec's: But the supply is able to drive the following: as per Vicor/Westcor spec's, it sounds like we need to de-rate to 70% and not to 50% to meet the blackbird systems requirements. (Bob Dave and Dick, make a note of this requirement - it is a must for MXD ie design to meet the 70% load rating and rate the supply to 900Watts.) full 70% Watts model number +5 80A 56.0 280 260-CU M5V/40ADV (2 units slots 2 and 3) +12 8.3A 5.8 69 261-CU M12V/16.7ADV (slots 1) -12 8.3A 5.8 69 261-CU (USES MODULE ABOVE 16.7/2 AMPS AND RVS LEADS) +24 8.3A 5.8 139 263-CU M24V/8.3 (SLOT 7) -24 8.3A 5.8 139 263-CU M24V/8.3 (SLOT 8) -5.2 38.2A 26.7 139 260-CU M5.2/38.5 (SLOT 6) -2 40.0A 28.0 56 26Z-CU M2V/40ADZ31 (SLOT 5) --------- total power (useable ) 891 Watts Again the unit needs to be tested for enviormental and it may be that we will need to reduce the power spec's further. ie safety, dynamic current, noise...etc. But my point is that the 4 additional amps on the +5V supply is easily met with the E1881A mainframe. Please keep in mind that the power supply spec's vary for the various input voltages and frequencies. ie 85 VAC @47-500HZ = 1000W 105 VAC @47-500HZ = 1200W 145 VAC @47-500Hz = 1600WAtts There have been a number of requests for the current and dynamic current spec's on the power supply for the E1881A. The following is what we are specifying, however, the power supply is running at 50% of its potential, as this increases the temp, and mtbf. The point being is there is a lot more current available then we are showing in our spec's. * These are preliminary spec's! Final Numbers will be available in the August 1999 time frame. Power - 600 Watts (1200 watt supply) Supply Voltage Current Dynamic Current Power +5V 30.0A 5.0A 150 +12 5.0A 1.0A 70 -12 5.0A 1.0A 70 +24 3.5A 1.0A 84 -24 3.5A 1.0A 84 -5.2 30.0A 2.0A 150 -2 7.5A 1.5A 15 Total Power - 623W Sincerely, Dwight