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POWER AMPLIFIER DPA 4120 / DPA 4140 OWNER'S MANUAL
DPA 4140
40 0 WATTS POWER AMPL IFIER
CLIP TEST
0dB
- 13dB
READY STANDBY
GROUND
PROTECT
FAULT
Performance Features
Power amplifier with 200 W or 400 W output power according to the IEC 283-3 standard within a
19“ - cabinet (3 HU) providing the following functions:
• supported are 115/230V AC mains as well as 24V DC emergency power source
• power amplifiers DPA 4120 providing 200 W or DPA 4140 providing 400 W output power, i
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Indicators, controls and connections 1 2 DPA 4140 400 WATT S PO WE R AM P LIFI ER C LIP TES T 3 0dB -13dB R EAD Y STAN DBY 4 G RO UN D PR OTE CT FAULT 5 8 7 6 10 11 12 13 B A 9 A A T4A FOR 230V NO USER SERVICEABLE PARTS INSIDE. REFER SERVICING TO QUALIFIED SERVICE PERSONNEL. T8A FOR 115V VOLT AGE SELECTOR DPA 4140 POWER 115V 230V 121629 INPUT 14 AC MAINS INPUT MADE IN GER MANY 115V /230V AC 50-60 Hz CAUTION: FOR CONTINUED PROTECTION AGAINST RISK O F FIRE REPLACE WITH SAME TYPE AND VALUE FUSE
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19 CIRCUIT ⊥ TO CHASSIS SWITCH B locking screws INPUT MODULE 20 DC INPUT 24V = (battery) 21 IDENT ADDRESS switch 22 REMOTE CONTROL connectors 23 STATUS indicator A locking screws power supply printed board Contents Performance Features.........................................................................................................................23 Indicators, controls and connections ......................................................................................
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14.3 NRS 90222 remote module .........................................................................................................69 14.4 NRS 90224 pilot tone and ground fault surveillance........................................................................70 15. Warranty ...........................................................................................................................................72 1. Utilization The amplifiers DPA 4120 and DPA 4140 are specially designed
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DPA 4120: For 115V AC operation, the mains fuse (11) has to be replaced by a slow blowing 4 ampere type, labeled "T4A" (see also paragraph 11.1). DPA 4140: For 115V AC operation, the mains fuse (11) has to be replaced by a slow blowing 8 ampere type, labeled "T8A" (see also paragraph 11.2). If the appliance is correctly connected and mains is present the green STANDBY indicator (4) will light. To remotely start the amplifier when it is being operated on the mains, it is necessary to interconnec
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figure 1 connections of the input sockets figure 2 LF cable for coupling two amplifiers DPA 41xx 5. Outputs 5.1 POWER OUTPUT The power output is balanced and off-ground potential. The output is factory-configured for the connection of 100V loudspeaker systems. Connection has to be performed by inserting the supplied 5-pole plug into the power output socket (17). Switching the output voltage to 70V, 50V or to low impedance operation (4 ohms) is possible using the plug-in bridge B411 on the pr
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of 200W (connection impedance 50 ohms) with the DPA 4120, respectively 400W (connection impedance 25 ohms) with the DPA 4140. Connection is performed using the 100V output (17) (see also figure 3). In a few special cases it is also possible to operate the loudspeaker systems with 70V or 50V output voltage (see also paragraph 7). Caution It is possible that during operation shock-hazard output voltages can be present at the POWER OUTPUT connector (>34V peak value). Thus, the connected loudspeak
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6.1 STANDBY indicator When the appliance is correctly connected and mains and/or battery power is present, the green STANDBY indicator (4) will light. 6.2 READY indicator Both amplifiers, the DPA 4120 and the DPA 4140, employ power-on switching delays of approximately 3 sec. to effectively eliminate power-on switching noise. After this time, the green READY indicator (7) lights and the READY fault message relay picks up when no error is being detected. When the power amplifier's mains transforme
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output bridge B411 to 100 V B407 70 V B408 50 V B409 4 ohms B410 table 1 bridge B411 settings figure 5 coding-bridges S405 / S406 settings switching the output voltage output recognition OUTPUT CONFIG Caution It is possible that during operation shock-hazard output voltages can be present at the POWER OUTPUT connector (>34V peak value). Thus, the connected loudspeakers have to be installed in accordance to applicable security standards and regulations (see also paragraph 8.5.2). 8. Enh
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Note: Functioning changes in the models DPA 4120 (starting with serial numbers: 100 11) and DPA 4140 (starting with serial numbers: 100 11) in association with the input module NRS 90225: To achieve reliable attenuation of switching noise (knacks), the monitor output stays muted as long as the READY-relay is not pulled. Because of circuit design reasons this causes that the monitor output is also muted even when a ground-fault appears at the main output. 8.2 Remote module NRS 90222 This input an
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- re-insert the input module and tighten the locking screws (B). 8.4 NRS 90227 output transformer for the floating, balanced monitor output In case that floating monitor outputs are required, the outputs of the INPUT MODULE NRS 90225 and REMOTE MODULE NRS 90222 are prepared for retrofitting output transformers. If so, it is necessary to additionally install the extension kit NRS 90227 per each output. The installation has to be performed as follows (see figure 6 and/or figure 7): - to remove th
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Output Transformer NRS 90227 figure 6 printed board assembly 81338 showing the input transformer NRS 90208 and the output transformer NRS 90 227 Input Transformer NRS 90208 Output Transformer 90 227 figure 7 printed board assembly 81339 showing the input transformer NRS 90208 and the output transformer NRS 90 227 8.5 NRS 90224 pilot tone & ground fault surveillance The extension NRS 90224 is meant for insertion. It includes a 19 kHz tone generator and a selective 19 kHz receiver with evaluatio
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When off-ground potential loudspeaker cable networks are employed we recommend insulation-monitoring using the ground fault surveillance module NRS 90224. Error recognition: An occurring ground fault either signals that one of the cables is damaged - which most likely point towards a total line interruption in the near future - or that connections have been carried out erroneously which may lead to malfunctioning of the entire system. The fault message GROUND FAULT (6) is also maintained with ve
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B 411 figure 8 printed board assembly 84187 in the DPA 4120 showing the NRS 90224 pilot tone & ground fault surveillance and the bridges B411 and S405, S406 for switching the output voltage; inserted 37
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NRS 90 224 S 406 S 405 B 411 figure 9 printed board assembly 84175 in the DPA 4140 showing the NRS 90224 pilot tone & ground fault surveillance and the bridges B411 and S405, S406 for switching the output voltage; inserted Checking the pilot tone surveillance function: When the NRS 90224 is installed and the power amplifier is switched on, the green READY indicator (7) has to light. The testing and reset button TEST (3) serves as a function control for the pilot tone surveillance. With the TEST
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Checking the ground fault surveillance function: When the NRS 90224 is installed and the power amplifier is switched on, the green READY indicator (7) has to light. Utilizing an external switch to connect one pole of the 100V-loudspeaker network via a 47 k ohms resistor for approximately 5 seconds to ground potential, the corresponding red GROUND FAULT indicator (6) has to light and the READY fault message relay of the INPUT MODULE NRS 90225 drops while the green READY indicator (7) stays lit. A
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F 503 F 502 figure 10 printed board assembly 85270 in the DPA 4120 showing the DC fuses F502 and F503 40
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F 503 F 502 figure 11 printed board assembly 85268 in the DPA 4140 showing the DC fuses F502 and F503 41
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F 601 F 602 figure 12 printed board assemblies 86243 DPA 4120 and DPA 4140 showing the AC fuses F601 and F602 Caution Before opening the appliance, make sure to disconnect the mains and/or battery power source! Replacing the fuses F502 and F503 (only to be carried out by the experienced service technician!) The battery fuses F502 and F503 are located on the power supply PCBs 85270 (DPA 4120) and 85268 (DPA 4140) behind the AMP battery connectors (see also figure 10 and/or figure 11). To rep
