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---
tag: m0917
title: L6474 Overcurrent Warning Test
brief: Find L6474 minimum current thresholds
author: shitcreek
requires: MONITOR_L6470_DRIVER_STATUS
group: L6474
codes: [ M917 ]
related: [ M916, M918]
notes:
- Requires `MONITOR_L6470_DRIVER_STATUS`.
- All tests assume each axis uses matching driver chips.
parameters:
-
tag: J
optional: true
description: Select which driver(s) to monitor on multi-driver axis.
values:
-
tag: 0
description: (default) Monitor all drivers on the axis or E0.
-
tag: 1
description: Monitor only X, Y, Z, E1.
-
tag: 2
description: Monitor only X2, Y2, Z2, E2.
-
tag: 3
description: Monitor only Z3, E3
-
tag: 4
description: Monitor only Z4, E4
-
tag: 5
description: Monitor only Z5, E5
-
tag: 6
description: Monitor only Z6, E6
-
tag: 7
description: Monitor only Z7, E7
-
tag: X
optional: true
description: Monitor X with the given displacement (1 - 255mm) on either side of the current position.
values:
-
type: mm
-
tag: Y
optional: true
description: Monitor Y with the given displacement (1 - 255mm) on either side of the current position.
values:
-
type: mm
-
tag: Z
optional: true
description: Monitor Z with the given displacement (1 - 255mm) on either side of the current position.
values:
-
type: mm
-
tag: E
optional: true
description: Monitor E with the given displacement (1 - 255mm) on either side of the current position.
values:
-
type: mm
-
tag: F
optional: true
description: Feedrate for the moves. If unspecified, uses the max feedrate.
values:
-
tag: feedrate
type: int
-
tag: I
optional: true
description: Starting overcurrent threshold. Report current value from driver if not specified. If there are multiple drivers on the axis then all will be set the same.
values:
-
tag: current
type: int
-
tag: T
optional: true
description: Current (mA) setting for TVAL (0 - 4A in 31.25mA increments, rounds down) - L6474 only. Report current value from driver if not specified.
values:
-
tag: current
type: int
-
tag: K
optional: true
description: Value for KVAL_HOLD (0 - 255) (ignored for L6474). Report current value from driver if not specified
values:
-
tag: Kvalue
type: int
---
The `M917` command runs a test procedure to find the minimum stepper current thresholds.
- Decrease OCD current until overcurrent error
- Increase OCD until overcurrent error goes away
- Decrease stall threshold until stall (not done on L6474)
- Increase stall until stall error goes away (not done on L6474)
|
