Tesira Operation Manual
11. Operation and performance
30
D SERIES Tesira Operation Manual rev 1.0.0
11.3.13. Mains anomaly protection
D Series ampliers incorporate several features to ensure continuous operation in case of irregularities in the AC
mains service.
Over–voltage – If the power supply detects mains voltage above 400 V peak or 270 V RMS, it will enter protective
shut down mode. The amplier will auto–restart if the condition clears. Fault will be indicated by a red LED and
associated error messages will register in Tesira and CAFÉ software programs.
Under–voltage – If the power supply detects mains voltage of less than 65 V, it will enter protective shut down
mode. The amplier will auto–restart if the condition clears. Fault will be indicated by a red LED and associated
error messages will register in Tesira and CAFÉ software programs.
Mains instability – If the power supply detects protracted instability in the AC mains, it will enter protective
shut down mode. The amplier will auto–restart if the condition clears. Fault will be indicated by a red LED and
associated error messages will register in Tesira and CAFÉ software programs.
Mains glitch – If the power supply detects a momentary mains glitch (missing cycles) at the AC inlet, a warning
indication will be reported with a yellow LED and associated error messages will register in Tesira and CAFÉ software
programs. The power supply and other product functions will continue operation throughout a mains glitch.
11.4. Power Supply
The R.SMPS (Regulated Switch Mode Power Supply) is designed to keep supply voltage rails at optimum levels.
Thus the R.SMPS can deliver full rail voltage to the output stage at all times, allowing the amplier to exhibit
consistent transient response and a clean LF response.
D Series features a universal power supply with power factor correction (PFC). The device can accept any mains
voltage, from 65 V to 265 V, allowing it to function worldwide in many different congurations. The PFC reduces
current peaks on the lines and reduces the requirements placed on the mains distribution system. D Series units
offer an unparalleled power factor extremely close to one.
11.4.1. Low Inrush Current
High power ampliers with inadequate inrush current limiting can draw considerable current from the mains at
turn–on, sometimes tripping a fast–acting mains breaker. The D Series, however, has very low inrush current to
prevent tripping of breakers. Several units can, under normal conditions, be powered up simultaneously. If you
do experience problems powering up multiple units simultaneously, they must either be turned on manually in an
ordered manner, or sequenced remotely. Alternatively, the capacity of the mains supply should be increased.
NOTE: If insufcient power is available to allow simultaneous power–up, then there is probably
insufcient capacity for full power output during operation. It is recommended that additional capacity is
added to the mains power distribution system.