Drive control apparatus

• US 9,547,305 B2
• Filed: 02/26/2013
• Issued: 01/17/2017
• Est. Priority Date: 03/15/2012
• Status: Active Grant

• Current Assignee: Omron Corporation
• Original Assignee: Omron Corporation
• Inventors: Ushiyama, Takao, Morikawa, Akihiko, Sato, Toshinori, Ueno, Junichi
• Primary Examiner(s): Ro, Bentsu
• Assistant Examiner(s): TRUNEH, ZEMENAY T
• Application Number:
  US13/777,207
• Publication Number:
  US 20130241460A1
• Time in Patent Office: 1,421 Days
• Field of Search: 318/565, 318/563, 318/560, 340/648
• US Class Current: 1/1
• CPC Class Codes: G05B 19/19 characterised by positioning or contouring control systems, e.g. to control position from one programmed point to another or to control movement along a programmed continuous path
• CPC Class Codes: G05B 19/4062 Monitoring servoloop, e.g. overload of servomotor, loss of feedback or reference
• CPC Class Codes: G05B 2219/42306 Excess in error, compare reference with feedback
• CPC Class Codes: G05B 2219/42309 Excess in speed
• CPC Class Codes: G05B 2219/42314 Warning signals are send when excess in error for speed, acceleration, amplitude
• CPC Class Codes: G05B 23/0286 Modifications to the monitored process, e.g. stopping operation or adapting control

Abstract

The operation state of a servo motor is monitored and output to a user before automatic termination of power to the motor. A servo system includes a servo motor and a safety unit. The safety unit cuts off electric power to the servo motor when at least one of a speed, a position, acceleration, an amount of movement, a movement direction, and torque of the servo motor is outside a first operation range. Furthermore, the safety unit outputs a warning when at least one of the speed, the position, the acceleration, the amount of movement, the movement direction, the torque is within the first operation range, but is outside a second operation range that is narrower than the first operation range. User controls allow reduced operation when outside the second operation range.

Claims

1. A drive control apparatus of a safety system, the drive control apparatus comprising:

a detection unit that detects operating values of a drive unit including at least one of a speed, a position, acceleration, an amount of movement, a movement direction and torque, and outputs a signal indicating one or more physical parameters associated with detected operating values (“

DOV”

) that indicate an operating state of the drive unit; and

a cut off unit that cuts off supply of electric power to the drive unit when the one or more DOV physical parameters are outside a first upper to lower limit range;

a safety unit that outputs, a warning when the DOV physical parameters are within the first range and additionally is outside a second upper to lower limit range, based on an input signal from the detection unit,

wherein the second range is narrower than the first range, and

wherein the warning includes information regarding whether the one or more DOV physical parameters are lower than the second lower limit range or whether the one or more DOV physical parameters are greater than the second upper limit range.

2. The drive control apparatus according to claim 1, wherein the safety unit monitors the one or more physical parameters, wherein the cutting off of the supply of electric power occurs between a period of time for which monitoring of the one or more physical parameters is effective and a period of time for which the monitoring of the physical parameter is non-effective, and the warning is output during monitoring of the one or more DOV physical parameters.

3. The drive control apparatus according to claim 1, wherein the warning is output as a warning signal.

4. The drive control apparatus according to claim 3, wherein the warning signal is as at least one of light and sound.

5. The drive control apparatus according to claim 3, wherein the warning signal is at least one of a physical signal and a logical signal.

6. The drive control apparatus according to claim 3, further comprising:

a control unit that controls the drive unit,

wherein the warning signal is output to the control unit, and

the control unit limits operation of the drive unit, while permitting operation of the drive unit.

7. The drive control apparatus according to claim 3, further comprising a displaying device that receives the warning signal and displays the warning.

8. The drive control apparatus according to claim 7, wherein the warning comprises a first warning signal that is displayed on the displaying device with a first pattern of light when the one or more DOV physical parameters is within the first range and is outside the second range, and wherein the warning comprises a second warning signal that is displayed on the displaying device with a second pattern of light different from the first pattern of light, when the one or more DOV physical parameters is outside the first range.

9. The drive control apparatus according to claim 7, wherein the warning comprises a first warning signal that is displayed on the displaying device with a first pattern of light when the one or more DOV physical parameters is less than the second lower limit range, and wherein the warning comprises a second warning signal that is displayed on the displaying device with a second pattern of light different from the first pattern of light when the one or more DOV physical parameters is greater than the second upper limit range.

10. The drive control apparatus according to claim 1, further comprising a setting unit that sets the second range according to a user interface input.

11. The drive control apparatus according to claim 10, wherein the upper limit and the lower limit of the second range are set from the user interface input.

12. The drive control apparatus according to claim 11, wherein the warning is output at operation at the upper limit and the lower limit of the second range.

13. The drive control apparatus according to claim 1, wherein the warning comprises a first warning signal that is output on a speaker with a first pattern of sound when the one or more DOV physical parameters is within the first range and outside the second range, and wherein the warning comprises a second warning signal that is output on the speaker with a second pattern of sound different from the first pattern of sound, when the one or more DOV physical parameters is outside the first range.

14. The drive control apparatus according to claim 1, wherein the warning comprises a first warning signal that is output from a speaker on the displaying device with a first pattern of sound when the one or more DOV physical parameters is less than the second lower limit range, and wherein the warning comprises a second warning signal that is output from a speaker on the displaying device with a second pattern of sound different from the first pattern of sound when the one or more DOV physical parameters is greater than the second upper limit range.