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BLUESTREAK SERIES
INSTALLATION & OPERATING MANUAL
P O W E R I N G T E C H N O L O G Y
Document Number: BLUESTREAK-MAN Rev. 6
bluestreak-man-rev6-0719.indd
12.6
Overvoltage Protection
- The power supply has two internal O.V.P. protection circuits. One
operates at a fixed voltage level and the other is programmable by the PMBus. The fixed
O.V.P. levels are defined below:
MODEL
FIXED OVP POINT
(nominal)
TBSR3000, RBSR12/100
21.1V
TBSR5000, RBSR24/54, RBSR24/60
31.9V
TBSR7000, RBSR28/28, RBSR48/37
59.4V
The default values for the programmable O.V.P. circuit can be found in the BLUEstreak
software manual. In order to reset the O.V.P. latch, the AC input must be cycled off for at
least 5 seconds before turning back on.
The O.V.P. latch is not resettable by PMBus command.
12.7
Overcurrent and short circuit protection
- The power supply will provide a constant
current limit in the event of an overload on the output. If the output voltage of the power
supply falls below a certain level, the power supply will enter a ‘hiccup’ mode of operation.
Removing the overload or short circuit will allow normal operation to resume. The voltage
at which the ‘hiccup’ mode of operation occurs is programmable down to the minimum
default setting.
12.8
Remote Sensing
- Remote sensing connections are made to pins B1 and C1 on the connector.
Remote sensing is not available on the +5V or +12V Standby outputs. Remote sensing is
used to regulate the output voltage at the point of load by compensating for the voltage drop
in the wires to the load. The +Sense lead (pin C1) must be connected to the +Ve side of the
load and the - Sense lead (pin B1) to the –Ve side of the load. The sense leads should be a
color-coded, twisted pair of AWG no. 22 or 24 copper wire.
Remote sensing can compensate for a total voltage drop of 0.5V, or 0.25V per load wire. The
sense leads should not exceed 10 feet (3 meters) in length. If remote sensing is not required,
the sense leads may be left open for local sensing at the output terminals.
Be careful not
to reverse the sense lead connections, as this could damage the unit.
12.9
Alarm, Control & Supervisory Signals
- All alarm, control and supervisory signals are
available on the connector at the rear of the unit. See section 9.2 for a complete description.
All logic signals are TTL level compatible are referenced to Standby Return and are isolated
from the main DC output.
12.10 PMBus
- The PMBus is available on the connector at the rear of the unit. BLUEstreak
modules can be addressed in the ranges 0x20 to 0x3E and 0xA0 to 0xBE.