Assessments - 3, GPA: 4.7
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Thermal Protection. If the heatsink temperature reaches an abnormally high temperature, the amplifier will protect itself by disconnecting speakers and shutting down until sufficiently cooled. During this time, the Protect LED will light. If the power transformer gets too hot, its thermal sensing circuit will disconnect both channel outputs. During this time, the Active LED will extinguish, the Protect LED will illuminate, and ACL LEDs will stay off, and the cooling fan will stay running. Once cool enough, the amplifier will resume operation automatically. If NexSys control is installed, thermal protect operation is reported to NexSys. Short Circuit. If an output is shorted, the IGM and thermal circuits will automatically protect the amplifier. The IGM circuit senses the short circuit as an extremely stressful load condition and attenuates the signal, protecting the channel’s output transistors from overcurrent stress. If the short circuit remains, the load will be disconnected by the thermal protection circuitry. DC Voltage Protection. If an amplifier channel detects DC voltage at its output terminals, the output relay will immediately open to prevent loudspeaker damage. The Protect LEDs will light. If NexSys control is installed, a DC protect condition is reported to NexSys. Crest Audio CK Power Processing Amplifiers Page 9 Sequential Turn-On/Turn-Off. CK Power Processing amplifiers come standard with the CC-STL Sequential Turn-On/Turn-Off (STO) Output/Power module installed. If the amplifier front power switch is set to “remote” and a voltage of between +8 to +18 VDC is applied across the “Com” and “+8 to +18V” terminals, a closure between the “In” and “Com” terminals will turn the amplifier on. Additional amplifiers are added to the chain by looping from the "Out" terminal of one amplifier into the "In" terminal of the next amplifier. Turn-on delay time between amplifiers fitted with basic modules (i.e., CC-STL) is approximately 100ms, turn-off delay time is 200ms. (When using NexSys-controlled Power/Output modules, these standard turn-on and turn-off delay times may be modified in the software). The number of CC-STL modules that an external DC supply will be able to power is dependent on the supply's voltage output and current capability. The external Direct Plug-In Power Supply Unit (CC-WW1, available from Crest Audio) supplies 9 volts at 300 milliamps and can power 15 CCSTL modules. If your configuration requires the STO control of more than 15 amplifiers, contact Crest Audio. Standard Sequential Turn-On/Turn-Off Wiring. For CK Power Processing amplifier systems configured for basic non-NexSys applications, (CC-IPB with CC- STL) an external Direct Plug-In Power Supply Unit is needed to provide a nominal +8 to +18 Volts to each STL module. Use only a two-wire power supply! This power supply (part number CC-WW1) may be ordered from Crest Audio . (Note that module CC-SDC has an integral STO power supply, and does not require CC- WW1). The “Com” and “+8 to+18V” terminals on each CK Power Processing amplifier are bussed together in parallel and connected to the DC supply. The “Out” ter- minal of each CK amplifier is connected to the “In” ter- minal of the next CK amplifier in the turn-on sequence. The first amplifier in the chain requires an SPST closure between it’s “In” terminal and “Com” terminal to initi- ate the power turn-on sequence and keep the amplifiers in the chain powered on. Output Com On Off Com On Off In Out Output Com On Off Com On Off In Out PC ® NC-NXS NC-NXS OffOn Com Out In +8 to 18VDC 20 mA NEC CLASS 2 ONLY Com Out In +8 to 18VDC 20 mA NEC CLASS 2 ONLY LISTED 8B42 COMMERCIAL POWER AMPLIFIER 120V~60 Hz 15A LISTED 8B42 COMMERCIAL POWER AMPLIFIER 120V~60 Hz 15A CC-WW1 Direct Plug-In Power Supply Unit +8 (min) to +18VDC (max) Standard Sequential Turn-On/Off (max. # of amplifiers is 15 per CC-WW1) Manually Initiated (hard-wired) Sequential Turn-On/Off using NexSys-compatible Power/Output Modules When employing NexSys-compatible Power/Output modules, use either NexSys-initiated Sequential Turn- On/Off OR (three-wire) hard-wired Sequential Turn-On/Turn-Off; NOT BOTH! NexSys-Initiated Sequential Turn- On/Off using NexSys-compatible Power/ Output Modules (unlimited # of amplifiers) Manual or NexSys-Compatible Sequential Turn-On/Turn-Off Wiring. CK Power Processing amplifiers fitted with a NexSys-compatible NC Power/Output Module (NC-STI, NC-SAC, NC-SLM) may be powered up via NexSys OR with a manual switch closure. If NexSys is employed, the STO delay time is also software-controllable. Note: when using NexSys control, hard-wiring for manual switch closure between amplifiers should be used cautiously. If the switch closure output is wired up, it WILL .cause the next amp to switch, regard- less of which source (hardware switch or NexSys STO command) has initiated the command. The modules (and the non-NexSys compatible CC-SIO) feature a 6-pin connector providing a 3-wire input from switch closure...
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