12 | M-Drive | User guide
The architecture of Powersoft’s amplifiers encompass
several protection mechanisms triggered by harmful signal
and temperature. Protection systems and triggers are
independently implemented in the power supply section
(power supply protection) and the amplifier section (amplifier
protections). (ref.
Chapter 15 : 3.Advanced parameters
12 : 1.Thermal Protections and Fan Control
Fan starts to run as soon as the amp module measures
a temperature greater than 35°*, the fan control keeps fan
at maximum speed for the first 2s, then its speed will be
controlled according to operating temperature.
When the amp module reaches 45°**, or when the
module reaches the 500 W threshold, the fan starts to run
at maximum speed.
At 60
o
the temperature Led will turn solid on, at 80
o
the
unit will shutdown.
The temperature of the Amplifier section is monitored
and replicated on the 34 poles interface connector
according to the TEMPON table:
12
Hardware protections
12 : 2.Power supply protections
Power supply protections aim to isolate a faulty section
in electrical power system from the rest of the device in
order to prevent the propagation of the fault and limit device
damages.
12 : 2.1. Primary AC mains overcurrent protection
AC main overcurrent are filtered by two 10 A time-lag
fuses (also known as time-delay or low blow-fuse). The
purpose of the time lag fuses is to allow the supply in
electricity for a short time before the fuses actually blow. If
the time-lag fuses blow out, the amplifier switch off; replace
the fuses with proper 10 A time-lag fuses in order to restore
the full functionality of the amplifier.
12 : 2.2. Primary AC mains overvoltage protection
AC mains overvoltage threshold is set to 295 V
rms
. If the
AC mains voltage exceeds 295 V
rms
the power supply stop
working; the device does not turn completely off but falls in
a “sleeping” mode: the power supply turns on again when
the AC mains voltage drops under 290 V
rms
.
AC mains overvoltage are well tolerated by the power
supply: no damages can be caused to the system even in
case of severe overvoltage up to 400 V
peak
.
12 : 2.3. Primary thermal protection
The temperature is detected at power supply and triggers
the heat dissipated by the device: if the temperature rises
exceeding components tolerances, the primary hardware
thermal protection starts lowering the rails voltage in order
to lower the heat wasted and keep the overall efficiency
high.
The process is drived by the DSP section of the Control
Board and is auto-adaptive, aiming to maintain the system
up even in heavy thermal condition.
12 : 3.Amplifier protections
The amplifier section protections are managed by the
DSP section on the Control Board and can be customized
by means of the ArmoníaPlus software.
12 : 3.1. Auxiliary power protections
Auxiliary plugs are protected against short circuit: a
poliswitch opens the auxiliary circuits when the current
drawn exceeds 1 A.
12 : 3.2. Secondary overcurrent protection
A secundary protection on the load shuts down the
amplifier section when an output current greater than 200 A
peak
is detected.
TEMP (
O
C)
TEMPMON (V)
0
2.69
5
2.57
10
2.44
15
2.30
20
2.16
25
2.00
30
1.85
35*
1.70
40
1.55
45**
1.41
50
1.28
55
1.15
60
1.04
65
0.93
70
0.84
75
0.76
80
0.68
85
0.61
90
0.55
95
0.50
100
0.46
