| 电机驱动可调衰减器 |
- ATM's motor driven variable attenuators utilize DC motors with integrated, long life gear reductions ideal for High Reliability applications.
- The unit will operate with a set DC voltage between 18-30VDC, commonly found in most systems or by a separate DC power supply. Motor speed will vary based on Voltage used. Maximum running current is 250mA & 600mA max starting.
- To prevent motor damage, Micro switches are used to stop the motor at the minimum and maximum travel positions
- Units are provided with 9 pin D Sub Male connectors allowing for control voltage, end point indication if desired, and follower potentiometer. See connector pin-out.
- These devices are best controlled by an external Double-Pole/Double-Throw (DPDT) switch or ATM optional control module .
- Any one of ATM's Continuously Variable Attenuators can be mounted to a motor drive.
- For Motor Drive Option add –28 to any of the 06 , 07 , 08 , Medium, & High Power attenuators Example: AF064-10 = AF064-10–28
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The above photograph shows an AV06 CVA mounted to a motor drive
Motor Drive Outline Drawings: 06 , 07 , 08 |
Motor Characteristics:
1. Motor Control Voltage
Pins 2 and 7 of the nine pin D Sub male connector will have fixed DC voltage between 18-30 volts applied. To increase pin 2 is + and pin 7 is -. To reverse the direction 2 is - and 7 is +. In both directions a stop is provided by means of Micro switches.
2. End Point Indicator *
The switch is also used to provide end point indication by means of pins 1 and 6 developing a voltage when the device has reached the maximum limit, (for 2+ and 7-). Pins will 3 and 8 will develop a voltage when a minimum limit is met. (for 2- and 7+). The developing voltage is equal to supply voltage used.
3. Follower Potentiometer **
A 10K Pot with an output proportional to the position of the motor drive mechanism is available at pins 4, 5, and 9.
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Motor Pin-Out
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Pin # |
Function |
+ 2 |
Increase Attenuation |
– 7 |
– 2 |
Decrease Attenuation |
+ 7 |
+ 1 |
* End Point Indicator
(Max. Phase) |
6 |
– 3 |
* End Point Indicator
(Min. Phase) |
8 |
** 10K Follower Potentiometer |
4 |
Pot End Points |
9 |
5 |
Wiper |
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Atm Optional Control Module:
An External Drive Module part number MCM-001 shown at right, is available for the motor drive as an optional accessory. It includes:
1. Crisp tactile switches to control drive.
2. Max/Min position indicator lights.
3. Follower potentiometer terminals.
4. Self-switching power supply with input of 120 VAC - 240VAC.*
5. 6 Ft, 9 pin cable to interconnect the control box to the motor driven device.
*If supplied power source is not used, an input of 18-30 VDC through the 9 pin connector may be substituted. |
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