Santerno Sinus Penta - 47 Bridge Crane Menu; Overview; List of Parameters C300 to C303

PROGRAMMING GUIDE
SINUS PENTA
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47. BRIDGE CRANE MENU
47.1. Overview
For lifting applications, it may be necessary to consider the opening/closing of a mechanical brake in order to obtain a
proper control of the connected motor.
For example, if a mechanical brake takes 500ms to open after the start command – the delay is due to the type of brake
– the motor will not be running for 500ms, while the speed reference increases the preset ramp. The motor then pushes
against the brake, and when it can rotate freely, the motor torque will not match with the torque required to move the
connected load.
If the speed setpoint is kept to zero for a given time after sending the start command (considering the time required for
the mechanical brake to open), the motor control will implement the proper torque for the motor speed as soon as the
motor can start rotating.
The brake closure can be controlled via a digital input that is properly set up; when the drive detects the brake closure, it
automatically adjusts the value of the current injected into the motor to the fluxing value. This is required when, during
the lifting stage, the mechanical brake closes when the load is suspended after reaching negligible speed. In that case,
the torque produced by the motor is capable of keeping the load hanging; when the brake closes, this has no effect on
the speed regulator, because the motor is already standstill. When the brake closes, no torque must be generated to
keep the load hanging, so the current injected into the motor drops to the value required for the motor fluxing.
NOTE The Bridge CRANE menu is used for VTC and FOC Control only.
NOTE
For safety reasons, the brake closure contact must be an NO
contact (closed contact
only when the brake is engaged).
NOTE
In addition to parameters C300 to C302, a dedicated MDO must be set as 6:BRAKE (see
the DIGITAL OUTPUTS MENU).
47.2. List of Parameters C300 to C303
Table 124: List of parameters C300 to C303
Parameter FUNCTION User Level
MODBUS
Address
DEFAULT
VALUES
C300
Positive pretensioning torque [%Cmot]
ENGINEERING
1300
0.0%
C301
Positive pretensioning torque time
ENGINEERING
1301
0ms
C300a
Negative pretensioning torque [%Cmot]
ENGINEERING
1308
0.0%
C301a
Time period of negative pretensioning
torque
ENGINEERING 1309 0ms
C302
Closed brake input (NO contact)
ENGINEERING
1302
0: None
C303
Brake activation during Tracking Error
ENGINEERING
1304
1: Yes