ElmoMC SimplIQ Digital Servo Drives-Bell Command Reference - Manual (Page 43)

CL[N] - Current Continuous Limitations and
Motor Stuck Protection Parameters
Purpose:
Defines the continuous loading of the drive.
CL[1] defines the maximum allowed continuous motor phase current, in amperes.
This parameter is used to protect the motor from over-current, and the load from
excessive torques. The motor current (torque) command is normally limited to its
peak limit, as defined by PL[1]. After a short period of torque demands higher than
CL[1] (as defined by the PL[2] parameter and equations in the
SimplIQ for Steppers
Application Note), the torque command limit is decreased to CL[1]. The torque
command remains limited to CL[1] until the average torque demand falls below 90%
of CL[1] for a few seconds. CL[1] has no effect if CL[1] > PL[1].
CL[2] and CL[3] define how the motor stuck protection is handled. A stuck motor is a
motor that does not respond to the applied current command, due to failure of the
motor, the drive system or the motion sensor.
CL[2] defines the tested torque level as a percentage of continuous current limit CL[1].
CL[3] states the absolute threshold of the main sensor speed under which the motor is
considered to be not moving. If the motor is stuck, motion fault MF=2,097,152
(0x200,000) is set.
If CL[2] < 2, the motor stuck protection is not applied.
For other values of CL[2], the motor is disabled and MF is set to 0x200000 if the motor
current command level exceeds a selected level for more than 3 seconds, without the
result of a significant motor speed, as defined by CL[3].
Attributes: Type: Parameter, Real
Source: Program, RS-232, CANopen
Restrictions: None
Default values:
CL[1]=0 (RS), Non-volatile,
CL[2]=0 (RS), Non-volatile,
CL[3]=60 (RS), Non-volatile
Range: CL[1]: [0…MC/2]
CL[2]: [0…100]
CL[3]: [0…16,000]
Index range: [1…3]
Unit modes: All
Activation: Immediate
SimplIQ:
Similar
Example:
If CL[2]=50 and CL[3]=500, the drive will abort (reset to MO=0) with motion fault
(MF) 0x200000 if the torque level is kept at least 50% of the continuous current, while
the absolute value of the shaft speed does not exceed 500 counts/sec for a continuous
3 seconds.
SimplIQ for Steppers Command Reference Manual Alphabetical Listing
MAN-STECR (Ver. 1.1)
35