Qsc - It42Inst 电路图.pdf

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1、CX 302 Amplifier Amplificateur CX 302 CX 302-Verstrker Amplificador CX 302 16.48 418.6 mm 17.31 439.7 mm To front rack rail Vers le rail montage avant Zur Vorderrackstange Hacia la barandilla de montaje anterior Figure 4 1 2 345 6 6 INTRODUCTION The IT-42 is an output isolation transformer accessory

2、 for the QSC CX 302 amplifier, allowing it to drive two 25-, 70-, and 100-volt distributed lines in stereo or parallel, or a single 140- or 200-volt line in bridged mono. It mounts conveniently to the back of the amplifier and requires no additional rack space. In stereo or parallel modes, the two d

3、istributed lines may be loaded at up to 400 watts each. In bridged mono, the distributed line may be loaded at up to 800 watts. Figure 1 shows the necessary mounting and configuration features of the IT-42 1. Mounting tabs 2. Transformer input wires with spade lug connectors 3. Isolated output barri

4、er strip 4. Transformers 5. Slotted mounting tabs ( 2) 6. #8-32 5/16” Philips screw, black ( 2), included IT-42 Installation Guide Figure 1 Figure 3 *TD-000081-00* TD-000081-00 Preliminary Figure 2 INSTALLATION Although the IT-42 transformer accessory can be installed while the amplifier is already

5、rack mounted, installation is much easier with the amplifier out of the rack and placed face-down so it rests on its front panel. CAUTION: Turn off the amplifier before installing the IT-42 accessory. 1. Open the safety shroud over the amplifiers output barrier strip. Fully loosenbut do not removeth

6、e two screw terminals at the top and the two at the bottom. 2. Align the spade lug connectors on the transformer input wires with their respective screw terminals and slide them fully onto the screws. Tighten the screw terminals. 3. Insert the slotted mounting tabs on the right end of the IT-42 into

7、 the slots in the amplifier chassis (Figure 2). 4. Align the holes in the mounting tabs on the left end of the IT-42 with the threaded holes in the amplifier chassis. Insert and tighten the mounting screws. 5. Press the right end of the bracket in to the left so that the slotted tabs lock to the amp

8、lifier and will not pull out (Figure 3). Rack mounting The IT-42 adds to the depth of the amplifier, so you must allow more space at the rear of the rack. See Figure 4. Because of the additional weight of the transformers, it is important to support the amp at the back, even in fixed installations.

9、Rear rack ear kits for QSC amplifiers are available from QSCs technical services department or from your dealer or distributor. If you are using in the same rack two or more amplifiers with transformer accessories, separate them by at least one rack space to minimize crosstalk. RadioFans.CN 收音机爱 好者资

10、料库 CONFIGURATION With the IT-42 installed, the CX 302 amplifier can operate in several different configurations listed below. TWO-CHANNEL OR TWO-ZONE OPERATION (STEREO OR PARALLEL) Both channels 25V Both channels 70V Both channels 100V One channel 25V, the other 70V or 100V One channel 70V, the othe

11、r 100V BRIDGED MONO OPERATION 140V or 200V Amplifier settings: To minimize transformer saturation, we recommend always using the amplifiers 75 Hz input filters. We also recommend using the clip limiters in most applications. See the amplifier users manual for instructions on configuring filters and

12、clip limiters, as well as configuring the CX 302 for stereo, parallel, or bridged mono operation. Connecting outputs Turn off the amplifier before opening the safety shroud over the output barrier strip or making any changes to the output connections. Always close the safety shroud when you finish w

13、orking on the output connections and before turning the amplifier on. The illustrations at right will help you identify the correct output terminals for your distributed line. Use fully insulated wiring that conforms with local and national electrical and safety codes. Wiring for circuit classes lis

14、ted below are as specified by the 1999 National Electrical Code, which is prevalent in the United States. Codes in your location may vary. 25-VOLT LINE Connect the 25-volt distributed line across the 70V and 100V terminals. Use wiring suitable for a Class 2 circuit. 70-VOLT LINE Connect the 70-volt

15、distributed line across the COM and 70V terminals. Use wiring suitable for a Class 2 circuit. 100-VOLT LINE Connect the 100-volt distributed line across the COM and 100V terminals. Use wiring suitable for a Class 2 circuit. 140-VOLT LINE (BRIDGED MONO) Connect a jumper wire between the COM terminals

16、 of Channel 1 and Channel 2. Connect the 140-volt distributed line across the 70V terminals of Channel 1 and Channel 2. Use wiring suitable for a Class 3 circuit. 200-VOLT LINE (BRIDGED MONO) Connect a jumper wire between the COM terminals of Channel 1 and Channel 2. Connect the 200-volt distributed

17、 line across the 100V terminals of Channel 1 and Channel 2. Use wiring suitable for a Class 3 circuit. SCHEMATIC COM 70V 100V 25V line COM 70V 100V 70V line COM 70V 100V 100V line COM COM 70V 70V 100V 100V 140V line COM COM 70V 70V 100V 100V 200V line Ch. 1 + out Ch. 2 + out Ch. 1 - out Ch. 2 - out COM COM 70V 70V 100V 100V QSC Audio Products, Inc. 1675 MacArthur Blvd., Costa Mesa, California 92626 USA Phone: (714) 754-6175 Fax: (714) 754-6174 Technical Services phone: (714) 957-7150 Technical Services fax: (714) 754-6173 RadioFans.CN 收音机爱 好者资料库