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G120 D - Lift Motor drops when you release Brake

Created by: anoopbalagopal at: 3/5/2025 12:24 AM (6 Replies)

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3/5/2025 12:24 AM	Rate (0)
anoopbalagopal Experienced Member Joined: 4/4/2018 Last visit: 12/17/2025 Posts: 153 Rating: (1)	Hello We have vertical lift which is driven by G120D, the issue what i am facing is it drops when i try to move from the control panel (Jog/Backward/Forward). Below is the configuration what i have for the drive Setpoint specification: Setpoint specified in the PLC and ramp function in the drive Open-loop/closed-loop control type: Open-loop/closed-loop control operating mode: [21] Speed control (with encoder) Defaults of the setpoints/command sources: Macro drive unit: [27] EPOS with fieldbus Telegram configuration: [111] SIEMENS telegram 111, PZD-12/12 Drive setting: IEC/NEMA Standards: [2] NEMA (60 Hz line, SI units) Drive unit line supply voltage: 480 V Power unit application: [0] Load duty cycle with high overload for vector drives Motor: Motor type selection: [1] Induction motor Motor connection type: Delta Motor 87/104 Hz operation: No Number of motors connected in parallel: 1 Rated motor voltage: 380 Vrms Rated motor current: 9.60 Arms Rated motor power: 4.70 kW Rated motor power factor: 0.840 Rated motor frequency: 59.50 Hz Rated motor speed: 1750.0 rpm Motor cooling type: [0] Natural ventilation Motor temperature sensor type: [6] PT1000 Motor holding brake: Motor holding brake configuration: [1] Motor holding brake acc. to sequence control Motor holding brake opening time: 100 ms Motor holding brake closing time: 100 ms Important parameters: Reference speed: 1500.000 rpm Maximum speed: 1785.000 rpm Ramp-function generator ramp-up time: 3.000 s Ramp-function generator ramp-down time: 3.000 s OFF3 ramp-down time: 0.000 s Current limit: 14.40 Arms Drive functions: Technology application: [0] Standard drive Motor data identification and rotating measurement: [2] Identifying motor data (at standstill) Automatic calculation motor/control parameters: [1] Complete calculation Encoders: Name Encoder 1 : Encoder 1 Encoder type Encoder 1 : [3007] 2048 HTL A/B Code number Encoder 1 : 3007 Measuring system: Encoder system for the position control: Encoder 1 Mechanical system: LR motor/load motor revolutions: 1794 LR motor/load load revolutions: 289 Actual position value / position setpoint resolution : 10000 LU per load revolution (encoder resolution) : 50852 What should i need to do to avoid the drop of the lift? Anoop

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3/5/2025 3:51 AM	Rate (0)
Hati Platinum Member Joined: 9/21/2012 Last visit: 12/25/2025 Posts: 4829 Rating: (512)	Does your motor nameplate really have 380v to be connected in Delta?

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3/5/2025 8:10 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 5149 Rating: (772)	Is the direction of holding torque correct?
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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3/5/2025 4:48 PM	Rate (0)
anoopbalagopal Experienced Member Joined: 4/4/2018 Last visit: 12/17/2025 Posts: 153 Rating: (1)	That was a mistake .i need to reconnect to Star Hati Does your motor nameplate really have 380v to be connected in Delta?

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3/5/2025 4:49 PM	Rate (0)
anoopbalagopal Experienced Member Joined: 4/4/2018 Last visit: 12/17/2025 Posts: 153 Rating: (1)	Which is that Parameter jacek d Is the direction of holding torque correct?

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3/7/2025 9:48 AM	Rate (0)
jacek d Platinum Member Joined: 9/23/2005 Last visit: 12/23/2025 Posts: 5149 Rating: (772)	So other way around. Do direction of rotation of a motor and of an encoder match? anoopbalagopal Which is that Parameter jacek d Is the direction of holding torque correct?
	Regards, Jacek What is confusing you is the fact that you never see a number but always its digit representation. So you end up thinking that the number is the representation. - Andrej Bauer Any claims against me - based on whatever legal reason - resulting from the use of any code and/or ideas presented on this forum shall be excluded. #StayWithUkraine
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3/8/2025 7:30 PM	Rate (0)
anoopbalagopal Experienced Member Joined: 4/4/2018 Last visit: 12/17/2025 Posts: 153 Rating: (1)	It wasnt.We adjusted the brake open close parameters and also we invert the encoder values and all is good now jacek d So other way around. Do direction of rotation of a motor and of an encoder match? anoopbalagopal Which is that Parameter jacek d Is the direction of holding torque correct?

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This contribution was helpful to 1 thankful Users jacek d

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