Crown 460CSL Test 4 AC Power Draw, Test 5 Common Mode Rejection, Test 6 Voltage Gain

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Power Base-1 & 460CSL Amplifier Service Manual

Checkout Procedures

TEST 4: AC POWER DRAW

Spec: 90 Watts maximum quiescent.

Initial Conditions: Controls per standard.

Procedure: With no input signal and no load, measure AC line wattage draw. If current draw is excessive, check for high AC line voltage or high bias voltage.

TEST 5: COMMON MODE REJECTION

Spec at 100 Hz: –70 dB.

Spec at 20 kHz: –50 dB.

Initial Conditions: Controls per standard.

Procedure: No load. Inject a 0 dBu 100 Hz sine wave into each channel, one channel at a time, with inverting and non-inverting inputs shorted together. At the output measure less than –44 dBu. Inject a 0 dBu 20 kHz sine wave into each channel, one channel at a time, with inverting and non-inverting inputs shorted together. At the output measure less than –24 dBu. Adjust R921 or R1021, if necessary, to obtain the required measurements. (In older units the adjust- ments are done using N100/N200.)

TEST 6: VOLTAGE GAIN

Spec: ±3% when the Sensitivity Switch is set for 26dB gain, ±6% when the Sensitivity Switch is set for 0.775V or 1.4V sensitivity.

Initial Conditions: Controls per standard.

Procedure: No load connected. Inject a 0.775 VAC 1 kHz sine wave with the Sensitivity Switch in the 26 dB position. Measure 15.5 VAC ±0.07 VAC at the ampli- fier output. Inject a 0.775 VAC 1 kHz sine wave with the Sensitivity Switch in the 0.775V position. Measure 39.9 VAC ±1.2 VAC at the amplifier output. Inject a 1.4 VAC 1 kHz sine wave with the Sensitivity Switch in the 1.4V position. Measure 39.9 VAC ±1.2 VAC at the amplifier output. Return the Sensitivity Switch to the 26 dB position.

TEST 7: PHASE RESPONSE

Spec: ±10° at 1 Watt.

Initial Conditions: Controls per standard, 8 ohm load on each channel.

Procedure: Inject a 1 kHz sine wave and adjust for 1 Watt output (2.8 VAC). Check input and output signals against each other, input and output signals must be within 10° of each other.

TEST 8: LEVEL CONTROLS

Spec: Level controlled by level controls.

Initial Conditions: Controls per standard.

Procedure: No Load. Inject a 1 kHz sine wave. With level controls fully clockwise you should see full gain. As controls are rotated counterclockwise, observe similar gain reduction in each channel. When com- plete, return level controls to fully clockwise position.

TEST 9: CURRENT LIMIT

Spec: Current Limit at 13 ±2 Amps

Initial Conditions: Controls per standard.

Procedure: Load each channel to 1 Ohm. Inject a 1 kHz differentiated (or 10% duty cycle) square wave and increase output level until current limit occurs. Current limit should occur at 11 ±1 Amps. Observe clean (no oscillations) current clipping.

TEST 10: SLEW RATE & 10 KHZ SQUARE WAVE

Spec: >13V/µS.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a 10 kHz square wave to obtain 40 volts peak-to-peak at each output. Observe the slope of the square wave. It should typically measure 17 to 25 V/µS. Also, the square wave must not include overshoot, ringing, or any type of oscillation.

TEST 11: CROSSTALK

Spec: <33 mVAC at 20 kHz.

Initial Conditions: Controls per standard. Short input of channel not driven.

Procedure: 8 ohm load on each channel. Inject a 20 kHz sine wave into the Channel 1 input and increase output level to 37.4 VAC. Measure less than 33 mVAC at the output of Channel 2. Inject a 20 kHz sine wave into the Channel 2 input and increase output level to 37.4 VAC. Measure less than 33 mVAC at the output of Channel 1.

TEST 12: OUTPUT POWER

Spec at 8 Ohm Stereo: 205W at 0.1% THD.

Spec at 4 Ohm Stereo: 230W at 0.1% THD.

Initial Conditions: Controls per standard.

Procedure: Load each channel to 8 ohms. Inject a 1 kHz sine wave and measure at least 40.5 VAC at the output of each channel. Load each channel to 4 ohms. Inject a 1 kHz sine wave and measure at least 30.3 VAC. All power measurements must be at less than 0.1% THD.

TEST 13: REACTIVE LOADS

Spec: No oscillations. Safe with all types of loads.

Initial Conditions: Controls per standard.

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Contents Power BASE-1& 460CSL Avis Table of Contents Scope WarrantyIntroduction Parts Performance SpecificationsPower MechanicalVoltage Conversion BLUOverview FeaturesTheory Front END OperationError Amp Voltage TranslatorsGrounded Bridge Topology High Side HSOutput Device Emulation Protection Odep Low Side LSPositive Test 3 Odep Voltage Adjustment Checkout ProceduresTest 2 Output Bias Adjustment Standard Initial ConditionsTest 7 Phase Response Test 4 AC Power DrawTest 5 Common Mode Rejection Test 12 Output PowerTest 14 Odep Limiting Test 16 Signal to Noise RatioPost Testing Test 15 LF ProtectionCheckout Procedures Mechanical Non-Module Parts Chassis Front Assembly Output Assembly ONE PER ChannelBack Panel Assembly Main Chassis Assembly Output Modules Module InformationModule History Main ModulesQ42576-1 Output Module Parts List P10137-1 Board Q42661-1 Output Module Parts List P10137-1 Board Q42661-1 Output Module 4 Resistor #2 for PB-1Q42718-9 Output Module Parts List P10233-8 Board Q42718-9 Output Module 4 Resistor #3 for PB-1Q42885-6 Output Module Parts List P10305-4 Board Q42967-2 Output Module Parts List P10341-9 Board Q43200-7 Output Module Parts List P10397-1 Board Q42552A0 Main Module Original for PB-1 Q42552A0 Main Module Parts List D 6304B2 BoardNetwork Resistors Switches IC’SQ42664-5 Main Module Parts List D 6910-0 Board UPA75 PNP Q42682-7 Main Module Parts List D 6910-0 Board Q42682-7 Main Module #2 for PB-1Interconnects Trim POTBoard Mounts U1, U2 Q42776-7 Main Module Parts List D 7251-8 Board Q42776-7 Main Module 3rd Gain for PB-1Dpdt Side Header 5 PIN Q42953-2 Main Module Parts List D 7251-8 Board UPA75 Misc Q43060-5 Main Module Parts List D 7993-5 Board Jumper 7325-1 Ground Lift 7960-5 Sensitivity 6781-6 Stereo/Mono

460CSL specifications

The Crown 460CSL is a powerful combination of innovation and performance that redefines efficiency in the material handling industry. Designed for heavy-duty tasks, this electric lift truck offers an impressive range of features that cater to the demands of modern warehouses and distribution centers.

One of the standout characteristics of the Crown 460CSL is its advanced ergonomic design, which prioritizes operator comfort and productivity. The spacious operator compartment is designed to minimize fatigue during extended use, featuring a low step-in height for easy access and a fully adjustable seat that provides optimal support. The intuitive controls are positioned for easy reach, allowing operators to maneuver the lift truck with ease and precision.

At the heart of the Crown 460CSL is its robust AC motor technology. This powerful motor provides rapid acceleration and smooth operation, reducing both energy consumption and maintenance needs. The regenerative braking system helps to extend battery life by converting braking energy back into stored energy, making the lift truck more efficient during operations. Operators benefit from enhanced traction and stability, ensuring dependable performance on various surfaces.

The Crown 460CSL boasts industry-leading lifting capabilities, with a maximum lifting capacity often exceeding competitors. Its precision-engineered mast allows for smooth and steady lifting of heavy loads, while its advanced hydraulic system provides reliable control over load placement. The lift’s extended height options enable operators to handle tasks at varying elevations, from ground level to tall shelving systems, with confidence.

Safety is a top priority for Crown, and the 460CSL incorporates several features designed to protect both operators and the loads being handled. The truck is equipped with a comprehensive suite of safety features, including an integrated stability system, load monitoring capabilities, and a visibility-enhancing overhead guard. These features work together to provide operators with greater awareness of their surroundings, reducing the risk of accidents.

In terms of technology, the Crown 460CSL integrates advanced diagnostics and connectivity features. This enables fleet managers to monitor performance, track usage patterns, and schedule maintenance with ease. Remote access to diagnostic information ensures that any potential issues can be identified and resolved promptly, further enhancing the truck's reliability and efficiency.

In conclusion, the Crown 460CSL stands out in the crowded lift truck market due to its combination of ergonomic design, powerful motor technology, impressive lifting capabilities, and enhanced safety features. This electric lift truck is an excellent choice for businesses seeking to improve productivity and reduce operational costs while maintaining a safe and comfortable working environment for their operators.
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