Curtis 1239E - MOTOR: FEEDBACK OPTIONS MENU

Return to TOC Curtis 1239E-1269E Manual, os 37.0 RevA – May 2021
4 — PROGRAMMABLE PARAMETERS
pg. 61
MOTOR: LOS (Limited Operating Strategy) MENU
PARAMETER ALLOWABLE
RANGE
DESCRIPTION
LOS Upon Encoder Fault
|LOS_Upon_Encoder_Fault
|LOS_Upon_Encoder_Fault_Bit0 [Bit 0]
0x308F 0x00
On / Off
On / Off
Limited Operating Strategy (LOS) is typically used to drive the vehicle back to
a repair center at very low speeds in the event the motor encoder fails.
Following an encoder failure ((either Encoder Fault (fault code 36) or Stall
Detected (fault code 73)), and after the Interlock is cycled, the vehicle enters
LOS mode thus allowing drive without motor encoder feedback.
In LOS mode, the ability to achieve maximum torque—even for a very short
time—is considered more important than smoothness.
When LOS mode is entered, the Encoder LOS fault (fault code 93) becomes
active and the encoder fault ((either Encoder Fault (fault code 36) or Stall
Detected (fault code 73)) is cleared.
When this parameter is programmed On, LOS mode will be entered in the
event of an encoder fault followed by an Interlock cycle.
When programmed Off, in the event of an encoder fault the encoder fault
remains and drive is disabled.
LOS Max Speed
Enc_LOS_Max_Speed
0x3083 0x00
100 – 2000 rpm
100 – 2000
This parameter indirectly denes the maximum speed for LOS mode by
setting the maximum frequency that corresponds to LOS Max Speed. In LOS
mode the throttle commands a frequency that is interpolated linearly between
zero (at Throttle Command = 0%) and the programmed LOS
Max Speed (at Throttle Command = 100%).
LOS Max Current
Enc_LOS_Max_Current
0x3085 0x00
50 – 1000 A
500 – 10000
In LOS mode, a partial or full throttle command will result in the maximum
current set by this parameter. This current setting is clamped by the
controller’s rated current.
LOS Max Mod Depth
Enc_LOS_Max_Mod_Depth
0x3084 0x00
15 – 100%
177 – 1182
In LOS mode, the maximum modulation depth acts to limit the current at
higher speeds. This parameter should be set such that the modulation depth
limit is reached prior to the LOS Max Speed limit, so that the motor current
will fall off from LOS Max Current at higher speeds. This may allow the
vehicle to drive longer in LOS mode, as it lessens the chance of the motor or
controller overheating.
LOS Accel Rate
Enc_LOS_Accel_Rate
0x3086 0x00
2.0 – 15.0 s
2000 – 15000
Denes the rate (in seconds) at which the frequency increases when full
throttle is applied, while operating in LOS mode. This parameter should be
set to a slow rate (high parameter value) so the frequency command has a
very slow slew rate to ensure that the max torque point is hit for a reasonable
period of time; this decreases the probability of going over the slip curve, and
allows ramps or obstacles to be overcome.
LOS Decel Rate
Enc_LOS_Decel_Rate
0x3087 0x00
2.0 – 15.0 s
2000 – 15000
Denes the rate (in seconds) at which the frequency decreases when throttle
is released, while operating in LOS mode.