Question about interpreting BRAKE_MODE parameter (ID 90) on ACOPOSmicro 80VD100PD.C000-01

[novi (Noe Vizcarra)]

Hello everyone,

I’m working with an ACOPOSmicro 80VD100PD.C000-01, and I have a question regarding the interpretation of the BRAKE_MODE parameter (ID 90).

Since this device only has one digital output for brake control, I decided to use it for motor 1, and for motor 2, I’m controlling the brake via a PLC digital output.

To eliminate the “low brake voltage” error for motor 2, I set the BRAKE_MODE parameter to 2, and the error disappeared. However, I’m a bit confused about the interpretation:

• I understand that BRAKE_MODE is a 9-bit bitfield, and the value is entered in decimal.
• According to the documentation, decimal 2 corresponds to Bit 1: CMD_BRAKE at "Controller on" enabled.
• However, I assumed that to disable brake monitoring (and avoid the error), I should activate Bit 2: Control monitoring off, which would be decimal 4.

So my main question is:

Am I interpreting the BRAKE_MODE bitmask correctly?
I f I enter the value 2, am I really activating Bit 1 and not Bit 2?

Any clarification or reference would be greatly appreciated to better understand this configuration.

Thansk in advance.

Regards.

[michael_w]

HI there,

this is just pure numbers in different representation. If you do not feel comfortable interpreting any of those manually, the windows calculator can do this for you:

Step 1: Set it to programmer mode

Step 2: Click the icon to switch to binary view

Step 3: Click all the bits you want to set

You’ll see that setting only Bit 2 is decimal 4, so 2 is Bit 1, 1 is Bit 0 and so on…

So if you set it to decimal 2, yes, you din’t disable control monitoring.
Also I am unsure if you can even disable the low voltage monitoring that way.
To disable a brake, set all the parameters of the brake (MOTOR_BRAKE_…) to 0, then the drive should not attempt to open/close it for you