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The following procedure should be used to adjust the Speed Gain Trimpot: 
 
 

 

 
 
 
 
 
 
 
 
 
 
 
 
 
 

 
 
 

1) 

Set the motor speed to 5-10% of maximum speed. 

2)  Apply a load to the motor and observe if the speed 

increases or decreases. 

3) 

Remove the load. 

4) 

If speed increases under load, turn the trimpot counter-
clockwise. 

 

If speed decreases under load, turn the trimpot 
clockwise. 

5)  Repeat steps 2 through 4 until there is no observable 

change in speed when load is applied or removed. 

 
Note: if the motor oscillates when step 1 is attempted, turn the 

trimpot counter-clockwise until the motor runs smoothly; 
then proceed with steps 2-5. 

 

(3) MOUNTING PLATE 

 

The CN0121A is a linear amplifier. As a consequence it may dissipate considerable heat 
while running large motors at low speed under heavy load. This heat may cause damaging 
temperatures in the CN0121A. For this reason it is extremely important to properly heat sink 
the drive. 
 
Mount the CN0121A on a finned aluminum heat sink using thermal compound between the 
CN0121A and the heat sink. If needed, use a fan to force air over the heat sink. Monitor the 
case temperature of the CN0121A under the worst case motor load conditions. Do not let the 

case temperature exceed 70

°

C (158

°

F). 

Summary of Contents for CN0121A

Page 1: ...CN0121A H BRIDGE AMPLIFIER 3879 SOUTH MAIN STREET 714 979 6491 SANTAANA CALIFORNIA 92707 5710 U S A 0 M P A N Y ...

Page 2: ...ier Centent and the Centent Company logo are trademarks of Centent Company Other trademarks tradenames and service marks owned or registered by any other company and used in this manual are the property of their respective companies Copyright 2017 Centent Company 3879 South Main Street Santa Ana CA 97207 All Rights Reserved ...

Page 3: ...or velocity servo applications 2 1 3 1 TERMINAL STRIP CONNECTOR No terminals or connectors are required on the wiring to the CN0121A The recommended wire size is 16 22 gauge The terminal assignments and functions are described in the following sections MOTOR OUTPUTS TERMINALS 1 9 The positive motor lead is connected to Terminal 1 and the negative motor lead is connected to Terminal 9 With the moto...

Page 4: ... 1 5 257 ohm 270 1 0 150 ohm 150 DIFFERENTIAL INPUTS TERMINALS 7 8 Terminal 8 is the inverting input and Terminal 7 is the non inverting input If the voltage on Terminal 7 is positive with respect to Terminal 8 the motor will turn clockwise If Terminal 7 voltage is less than Terminal 8 voltage the motor will turn counter clockwise The input impedance is 10K ohms The Common Mode Voltage range is fr...

Page 5: ...SUPPLY INPUTS TERMINALS 2 10 The power supply is connected to Terminal 2 and Terminal 10 Terminal 2 is the positive supply input and Terminal 10 is the supply ground Reversing the power supply leads to the CN0121A will result in destruction of the drive so be careful to check the wiring before powering up the drive A regulated supply is recommended but is not necessary The power supply voltage can...

Page 6: ...tempted turn the trimpot counter clockwise until the motor runs smoothly then proceed with steps 2 5 3 MOUNTING PLATE The CN0121A is a linear amplifier As a consequence it may dissipate considerable heat while running large motors at low speed under heavy load This heat may cause damaging temperatures in the CN0121A For this reason it is extremely important to properly heat sink the drive Mount th...

Page 7: ... 5 3 0 2 5 2 0 1 5 1 0 open 5400 ohm 2400 ohm 1400 ohm 900 ohm 600 ohm 400 ohm 257 ohm 150 ohm AMPS RESIS TOR SPECIFICATIONS ELECTRICAL MIN MAX UNIT Power Supply Voltage 9 32 VDC Power Supply Current 70 mA Motor Voltage 25 25 VDC Maximum Load Current 5 5 A Voltage Gain 25 6 28 3 Frequency Response DC 20 KHz Common Mode Range 1 Vsupply V Input Impedance 10K ohms Input Offset 20 mV Input Bias Curren...

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