# Menu 29 − LSRPM Motor Set-up

Mode: RFC‑A

Parameter | 29.199 Low Speed Acceleration Ramp Control Enable
--- | ---
Short description | Set to 1 to enable the Low Speed Acceleration Ramp Control for LSRPM motors
Mode | RFC‑A
Minimum | 0 | Maximum | 0
Default | 0 | Units |
Type | 1 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 0
Coding | RW

This parameter is only used in RFC-S mode and has no effect in any other mode of operation.

If LSRPM Motor Set-up Enable (29.200) and Low Speed Acceleration Ramp Control Enable (29.199) are both set to On (1), low speed acceleration ramp control is enabled. Low Speed Acceleration Ramp Control Enable (29.199) is automatically set to On (1) on successful completion of LSRPM motor set-up as detailed in LSRPM Motor Set-up Enable (29.200).

If LSRPM Motor Set-up Enable (29.200) or Low Speed Acceleration Ramp Control Enable (29.199) is set to Off (0) then no low speed acceleration ramp control is used.

If Low Speed Acceleration Ramp Control control is enabled then the drive will ensure that the ramp rate used during the low speed operation of the motor (i.e. <15% of rated speed) is at least 4s/1000rpm. If the user selected ramp rate is longer than 4s/1000rpm, then the drive will use a ramp rate of 4s/1000rpm until Post Ramp Reference (02.001) is greater than 15% of Rated Speed (05.008) at which point the drive will then use the user entered ramp rate. Low Speed Acceleration Ramp Control works for both units of ‘seconds per 1000rpm’ and ‘seconds to maximum speed’ as defined by Ramp Rate Units (02.039). Low Speed Acceleration Ramp Control is disabled if S-ramps are enabled in S Ramp Enable (02.006).

Parameter | 29.200 LSRPM Motor Set-up Enable
--- | ---
Short description | Enables the LSRPM motor set-up
Mode | RFC‑A
Minimum | 0 | Maximum | 1
Default | 1 | Units |
Type | 1 Bit User Save | Update Rate | Background read
Display Format | Standard | Decimal Places | 0
Coding | RW, BU

This parameter is only used in RFC-S mode and has no effect in any other mode of operation.

If LSRPM Motor Set-up Enable (29.200) is set to On (1), the drive is in RFC-S mode and the drive is 400V rated model, then on successful completion of an autotune, the drive will attempt to determine the LSRPM motor connected from the values entered into Rated Current (05.007) and Rated Speed (05.008). The drive will then configure the following parameters correctly for the motor and drive combination.

- Ld (05.024)
- Required Over-current Trip Level (05.067)
- Lq At The Defined Iq Test Current (05.078)
- Current Controller Kp Gain (04.013)

Low Speed Acceleration Ramp Control Enable (29.199) will also be set to On (1) and a full parameter save initiated (Parameter mm.000 = 1000).

If a User Trip 40 trip occurs after the autotune then this indicates that drive was unable to determine the LSRPM motor being used and none of the parameters detailed above are modified. The motor rated current and motor rated speed should be corrected, and an autotune repeated. In some cases the motor nameplate value for the rated current is not always the optimum value for sensor-less control of the LSRPM motors.

If LSRPM Motor Set-up Enable (29.200) is set to Off (0), then the LSRPM motor set-up detailed above is disabled. LSRPM Motor Set-up Enable (29.200) should be set to Off (0) if the drive is required to control a non-LSRPM permanent magnet motor.