Watson-Marlow MM420 User Manual
Page 143
Issue 10/06
3 Functions
MICROMASTER 420 Operating Instructions
6SE6400-5AA00-0BP0
143
NOTE
Motors have optional holding brakes which are not designed to be used as
brakes for normal operation. The holding brakes are only designed for a limited
number of emergency braking operations / motor revolutions with the brake
closed (refer to the Catalog data).
When commissioning a drive with integrated holding brake it is therefore
absolutely imperative that it is ensured that the holding brake functions
perfectly. A "clicking noise" in the motor indicates that the brake has been
correctly released.
Parameter settings:
♦ To open/close, the digital output controls the motor holding brake at point 1/2
(refer to Fig. 3-58). In this case the prerequisite is that the motor holding
brake P1215 has been activated as well as the selection of the motor
holding brake at the digital output.
♦ Brake opening time P1216 is greater than/equal to the time to open the
holding brake.
♦ Brake delay time P1217 is greater than/equal to the time to close the holding
brake.
♦ Select the min. frequency P1080 so that it acts just like a weight equalization
function.
♦ A typical value for the min. frequency P1080 for the motor holding brake is
the slip frequency of the motor r0330. The rated slip frequency can be
calculated using the following formula:
n
n
sy
n
n
sy
Slip
f
n
n
n
P0310
100
r0330
[Hz]
f
⋅
−
=
⋅
=
♦ The following control parameters should be noted in conjunction with the
motor holding brake:
−
P1310, P1311, P1333, P1335