Parker 890SD - Page 408

Programming
Page D-64 890CS Common Bus Supply - Frames B & D; 890CD Common Bus Drive and 890SD Standalone Drive - Frames B, C & D
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Parameter Descriptions
MANUAL STATE
PREF: 155.05 Default: FALSE Range: FALSE / TRUE
When METHOD is set to MANUAL and ENABLE is set to TRUE, use this parameter to apply/release the brake (via a DIGITAL
INPUT and switch for example).
FALSE : the brake is ON
TRUE : the brake is OFF
BRAKE RELEASED
PREF: 155.06 Default: FALSE Range: FALSE / TRUE
This output describes the state of the mechanical brake. If TRUE, the brake is OFF.
Functional Description
When the MECH BRAKE function block is enabled a state-machine is used to open or close the drive's internal brake relay.
This state-machine has 4 states :
CLOSING relay is open, brake is closing
ON relay is open, brake is on
OPENING relay is closed, brake is opening
OFF relay is closed, brake is off
The diagram opposite shows the state-machine transitions
for when METHOD is set to AUTOMATIC or MANUAL.
MANUAL STATE = FALSE
MANUAL STATE = FALSE
ON
OFF
Opening
Closing
MANUAL STATE = TRUE
T OPEN has elapsed
T CLOSE has elapsed
MANUAL STATE = TRUE