Itec DIGIPOWER 2x250T User manual

DIGIPOWER 2x250T
POWER AMPLIFIER
MANUAL
VERSION 1.0, MAY 2011
Designed and Manufactured by
ITEC Tontechnik und
Industrieelektronik GesmbH
8200 Laßnitzthal 300
Austria / Europe
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ITEC DIGIPOWER 2x250T - INTRODUCTION
Dear Customer,
The power amplifiers of the series “ITEC DigiPower” offer due to the latest digital technology in place an
extremely high efficiency.Another feature is the very low power consumption in the automatic standby mode.
Therefore “ ITEC DigiPower amplifiers” are ideal for the use in voice alarm systems. For this application
alternatively to the standard 230V AC power supply a supply from a 24V DC backup battery can be
provided.
LEDs on the front panel show the proper function of the power amplifier and the power supplies.
This information can be passed on to higher-order control and fault indication systems via floating relay
contacts.
ITEC DigiPower amplifiers are very robust and reliable. They are designed for a continuous operation in pro-
fessional sound reinforcement systems. Dynamic limiters provide an effective overload protection and avoid
distortion or damages of the speaker systems. Short-circuit and over temperature protection ensure a maxi-
mum operational safety. Various practical details and the convenient, streamlined design facilitate installation
and operation.
Please read this instruction manual carefully and observe all instructions in particular those safeties related
to ensure a long lasting and trouble-free operation.
We are happy to assist you in any other questions concerning sound, voice alarm, security, sound, speech
technology, media remote control, conference room facilities, etc.
Your ITEC acoustics team
ITEC DigiPower 2x250T – Features
• LED indicators for signal and operating conditions
• Monitoring contacts for battery
• Monitoring contacts for the output amplifier
• 2 channels in a 19-inch, 2 units of height case
• Low installation depth of only 260 mm
• All feed lines with plug-in, screw terminals
• Balanced Inputs
• Automatic standby mode
• Protection against open circuit, short circuit, over temperature, DC
• 230V AC and 24V DC power supply
• Switching on delay

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DIGIPOWER 2x250T
ITEC DIGIPOWER 2x250T
Safety instructions
Please read this instruction manual carefully before installation and putting the “ITEC DigiPower” amplifier
into operation. Keep this document easy to find on a safe place to have it available as a later reference.
Instruct all persons dealing with this device and make them familiar with its use and in particular with the
safety regulations.
When installing the device, local connection conditions, required protective measures and all relevant
standards must be observed.
Do not block, cover or obstruct the vent slots: The air circulation has to remain ensured.
The device is designed for installations in 19“ cabinets / racks / frame / housing. Improper installations in
furniture, cabinets or distribution systems as well as a free putting have to be avoided.
Operate the device only via a grounded safety power outlet. Make sure the power cable is not damaged.
Never remove the ground wire of the feeder.
Before connecting to the mains supply check that the data on the backside of the device match with the local
network.
The device must necessarily be checked by trained personnel in case:
The power cable or plug are damaged, small objects or liquids got into the device, the device operates in a
different way than usual, the device was exposed to a severe impact or the housing has been damaged.
Extended storage or operating in rooms with high humidity, during rain or under the influence of splash water
can lead to damages or malfunctions.
Do not apply temperatures above 50 °C, humidity larger than 95% or rain to the device.
Never try to open the device by force or by unscrewing. The product does not contain parts that can be re-
paired by amateurs. Please contact the manufacturer or a local distributor.
For cleaning use a soft, dry cloth only. Never use cleaning agents or solvents which attack the surface or
could enter the device. Unplug the device before cleaning.
NOTE: Before carrying out any modifications of the device by a specialist, the device has to be disconnected
both from the mains supply as well as from the 24V DC power supply.

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ITEC DIGIPOWER 2x250T - FRONT VIEW
Fault Clip
Signal
Channel B
Fault Clip
Signal
Channel A
24V DC
230V AC Operating mode Operating mode
10
9876
1 2 3 4 5
1. 24V DC: indicates that 24V DC power is applied
2. Channel A Fault: indicates a fault, e.g.: thermal overload at channelA
During normal operation this LED flashes shortly after powering up until the protection mode
is terminated and the speaker output is enabled.
3. Channel A Clip: indicates an excessive input signal and the activation of the built-in limiter to prevent a clipping
of the signal
4. Channel B Fault: as item 2, but for channel B
5. Channel B Clip: as item 3, but for channel B
6. 230V AC: indicates that the applied voltage is 230V AC. The device is supplied by this voltage -
the 24V DC remains unloaded.
7. Channel A Operating Mode: Indicates that channel A is active. This means a signal at input A is present,
which is amplified. If no signal is detected, the amplifier switches to a low power
standby mode - the LED turns off.
8. Channel A Signal: indicates that the signal is > 30dB.
9. Channel B Operating Mode: as item 7, but for channel B
10. Channel B Signal: as item 8, but for channel B

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DIGIPOWER 2x250T
ITEC DIGIPOWER 2x250T - BLOCK DIAGRAM
ITEC DigiPower 2x250T Block diagram
230 V AC
24 V DC +
–
230 V OK
+ 24 V
24 V OK
CH A OK
100 V
50 V
0
IN A1
IN A2
Switch IN2
Pilottone Protect
+ 24 V
Volume A A
CH B OK
100 V
50 V
0
IN B1
IN B2
Switch IN2
Pilottone Protect
+ 24 V
Volume B B

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ITEC DIGIPOWER 2x250T - BACK VIEW
Fault
OK
Clip
Signal
Channel B
Fault
OK
Clip
Signal
Channel A
Mains
Battery
USE ONLY FOR A 250V FUSE
n -
-7
Volume
Volume
PILOT TONE SWITCH I 2
n
A I 2 GND A IN2 + A IN1 - GND A IN1 +
PILOT TONE SWITCH I 2
n
B I 2
n -
GND B IN2 + B IN1 - GND B IN1 +
CH B
CH A
24V OK
CH A OKCH B OK
230V OK
DC IN 24V
OU T B O UT A
0 / 50 / 1 00V
500W
0 / 50 / 1 00V
2V30 / 6,3A / M
50 60Hz, 50VA
+
CONNECTIONS ARE ONLY ALLOWED AS SHOWN
~
11
12 28 27
11. AC 230V: The power cord is plugged in to the panel connector containing an integrated fuse (6,3A).
The device becomes active, when a voltage of 230V AC is applied
12. DC IN 24V: The 24V DC power supply is connected to the terminal block. In case of a breakdown of the
230 V supply a switch to the 24V DC supply is carried out without interruption. As long as
a supply via 230V AC is made the power consumption at the 24V DC input is kept at a
minimum level (40mA for measurements).
13. CH A Volume: Volume control for channel A; adjustable with a little screwdriver.
14. A IN1: Balanced signal input for channel A.
15. A IN2: Second, symmetrical signal input for channel A. If the corresponding terminal is „Switch IN2“
to set to GND, this signal is alternatively used instead of “A IN1”.
16. SWITCH IN2: Used for switching from A IN1 to A IN2. Becomes active when contact is set to GND.
See also item 15
17. PILOTTONE: A pilot tone signal connected to this terminal (unbalanced) is added to the input signal A.
The volume control has no effect on the pilot tone.
18. CH A OK: Floating contact, closed in case channel A works in proper conditions. After switching on the
contact remains open for a few seconds until the protection mode is terminated and the
speaker output is enabled.
19. 24V OK: Floating contact, closed when 24 V DC is applied properly

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DIGIPOWER 2x250T
A series connection of the two outputs A and B is possible.
The output power in this case is 500W / 100V. Using the brid-
ged mode, the input signal has to be applied in parallel to “A
IN1” and “B IN1”. The two volume controls of “CHAVolume”
and “CH B Volume” must be placed into the same position.
If the alternative inputs “A IN2” and “B IN2” are used, the
alternative signal has to be applied in parallel to both inputs.
The two terminals “SWITCH IN2” must be connected in par-
allel in this case as well.
If a pilot tone has to be added at the power amplifier, it has
to be applied in parallel to both pilot tone terminals. The fault
signal contacts “CH A OK” and “CH B OK” and can be con-
nected in series to a common alarm message.
ITEC DIGIPOWER 2x250T
DIGI POWER 2x250T
n-
n -
Volume
Vo
Vo
lume
lume
Volume
V
olum
olume
PILOT TONEPILO
PILO
TT
T T
ONE
ONE
SWITCH I 2n SWITCH
SWITCH
I2
I 2
n
AI 2n-AI
A I 2
GNDGND
GND
AIN2+AI
A I
N2
N2 +
AIN1-AI
A I
N1
N1 -
GNDGND
GND
AIN1+AI
A I
N1
N1 +
PILOT TONEPILO
PILO
TT
T T
ONE
ONE
SWITCH I 2n SWITCH
SWITCH
I2
I 2
n
B I 2n-B
B
I2
I 2
n-
n -
GNDGND
GND
B IN2 +B IN
B IN
2+
2 +
B IN1 -B IN1
B IN1 -
GNDGND
GND
B IN1 +B IN1
B IN1 +
CH BCH
CH B
CH ACH
CH A
24V OK24V OK
24V OK
CHAOKCH
CH
AO
A OK
CH B OKCH B OK
CH B OK
230V OK230V OK
230V OK
Made Germanyin
RISK OF ELECTRIC SHOCK
DO NOT OPEN BEFORE DISCONNECT MAINS PLUG
13 14
20
15 16
17
18 19
21 22 23
24
25 26
20. CH B Volume: like item 13, but for channel B.
21. B IN1: like item 14, but for channel B.
22. B IN2: like item 15, but for channel B.
23. SWITCH IN2: like item 16, but for channel B
24. PILOTTONE: like item 17, but for channel B
25. CH B OK: like item 18, but for channel B
26. 230V OK: Floating contact, closed when the 230V AC power is applied properly.
27. OUTA: Output terminal A. Floating, transformer-balanced power output (100V or 50V)
28. OUT B: like item 27, but for channel B.
Bridged-Modus: OUT B OUTA
0 50 100 0 50 100
100 V / 500 W
CH A/B OK
Pilottone
Switch IN2Signal 2Signal 1
IN1 + GND IN1 - IN2 + GND IN2 - SWITCH PILOT
A
B

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Fault Clip
Signal
Channel B
Fault Clip
Signal
Channel A
DIGI POWER 2x250T
24V DC
230V AC Operating mode Operating mode
USE ONLY FORA 250V FUSE
n-
n -
-7
Volume
Vo
Vo
lume
lume
Volume
V
olum
olume
PILOT TONEPILO
PILO
TT
T T
ONE
ONE
SWITCH I 2n SWITCH
SWITCH
I2
I 2
n
AI 2n-AI
A I 2
GNDGND
GND
AIN2+AI
A I
N2
N2 +
AIN1-AI
A I
N1
N1 -
GNDGND
GND
AIN1+AI
A I
N1
N1 +
PILOT TONEPILO
PILO
TT
T T
ONE
ONE
SWITCH I 2n
SWITCH
SWITCH
I2
I 2
n
B I 2n-B
B
I2
I 2
n-
n -
GNDGND
GND
B IN2 +B IN
B IN
2+
2 +
B IN1 -B IN1
B IN1 -
GNDGND
GND
B IN1 +B IN1
B IN1 +
CH BCH
CH B
CH ACH
CH A
24V OK24V OK
24V OK
CH A OKCH
CH
AO
A OK
CH B OKCH B OK
CH B OK
230V OK230V OK
230V OK
Made Germanyin
DC IN 24V
OU T B O UT A
0 / 50 / 1 00V
500W
0 / 50 / 1 00V
2V30 / 6,3A / M
50 60Hz, 50VA
+
CONNECTIONS ARE ONLY ALLOWED AS SHOWN
~
RISK OF ELECTRIC SHOCK
DO NOT OPEN BEFORE DISCONNECT MAINS PLUG
TYPE 2x250T
Output Power 2 x 250 W or 1 x 500 W
Total Harmonic Distortion < 0,2 %
Input sensitivity 1V @ 10 kOhm
Output transformer 2 x 50 V / 100 V
Power consumption in standby mode (230V) 10 W
Power consumption at full load (230V) 630 W
DC current consumption in standby mode 400 mA
DC current consumption during 230V AC operation 40 mA
Inputs symmetrical on screw terminal
Supply voltage 230 V AC / 24 V DC
Noise ratio 250W 1 kHz 85 dB
Frequency response 70 Hz ÷ 20 kHz / -3 dB
Operating temperature -5° bis +40°
Protection circuits DC, short circuit, resonance, over temperature
Dimensions 482 x 88 x 260 mm (W x H x D), 19“ / 2HE
Weight 16,5 kg
ITEC DIGIPOWER 2x250T - SPECIFICATIONS
482 mm
88 mm
Depth: 260 mm
No responsibility is taken for the correctness of this information - Specifications subject to change
431 mm
ITEC-Tontechnik und Industrieelektronik GesmbH,A-8200 Lassnitzthal 300 / Austria / Europe
Tel.: [phone] / 3780-0, offi[email protected], www.itec-audio.com