Specifications

YASKAWA Inverter Drive A1000 – Crane Software Application Manual
35
7. Description of Added Functions
In this section, all new functions that the A1000 Crane Drive has compared to the standard A1000 drive are described in
detail.
7.1 Brake Sequence
For the brake to open and close while generating the necessary torque for the load to maintain a stationary position, the
brake sequence on the A1000 Crane Drive has been specially modified. In this section the parameters that control the
brake release function are described, a detailed time chart is shown for the brake sequence in each control mode, and
the brake sequence faults are explained. To better understand the descriptions, the following terms and abbreviations are
defined:
FWD Run Command, REV Run Command
: Refers to the signals received by the drive to operate the motor in the
forward (FWD) or reverse (REV) direction. By default these signals are input to terminals S1 and S2 respectively, but
they can also come from any other digital input terminal or the digital operator. When the Run Command is programmed
to come from the digital operator, the brake sequence is completely disabled. Unlike the standard A1000 drive, the crane
version does not allow these commands to be received by MEMOBUS/Modbus communication or via an Option Card.
The following table shows drive operation when these signals are received through digital inputs.
FWD Command REV Command Drive Operation
OFF OFF Stops motor according to stopping method in b1-03
ON OFF Runs the drive in the FWD direction
OFF ON Runs the drive in the REV direction
ON ON
Motor coasts to stop, an SE1 fault is triggered, and external brake is closed. If
S1-16 is set to 0.00, motor will decelerate to stop according to C1-02 before
closing the brake and EF alarm is displayed on the digital operator (no fault).
Brake Release Command (BR)
: Output command used to open or close the external brake. This command is output by
default to the M1-M2 relay terminals, but can be programmed to any other digital output relay. When the relay is open (no
electrical continuity) the brake is closed and the motor shaft (and therefore the load) should not move. When the relay is
closed (short circuit) the brake is energized and is opened so that the motor shaft can be moved.
Brake Release
Check (BX): Feedback command received by the drive from external circuitry to ascertain that the brake
has effectively been opened. By default this signal is received at digital input terminal S5, but can be programmed to any
other digital input. If the Brake Release Check (BX) is programmed to a digital input, the Brake Release Command (BR)
must be programmed to a digital output relay, otherwise a Parameter Setting Error (oPE22) will be triggered.
Drive Output Current (IOUT)
: Drive output current as a percentage of motor rated current.
Drive Torque Reference (ITR): Drive internal torque reference as a percentage of motor rated torque.
Brake Operation Delay Time (BDT): Time between the moment the Brake Release Command (BR) is activated and the
brake is actually completely opened. This time is inherent to each external brake and is not dependent on the drive or the
motor.
7.1.1 Brake Sequence Parameters (S1-)
In this section the parameters relating to the brake sequence are described, along with their interdependencies and
commonly used settings for different control modes. An abbreviation is also assigned to each parameter for later use in
the brake sequence time charts.
S1-01 FWD Brake Release Frequency (FRF)
: When a FWD Run Command is given, one of the conditions for the Brake
Release Command (BR) to be activated is that drive output frequency must surpass the value set in this parameter. FRF
should be set to a value smaller than the Brake Delay Frequency BF (S1-03) and larger than both b2-01 (DC Injection
Start Frequency) and E1-09 (Minimum Output Frequency). When operating in CLV control mode without a counter weight,
FRF should be set to zero, and FWD Torque Compensation FTC (S1-09) can be increased if slipping occurs at start.
S1-02 REV Brake Release Frequency (RRF)
: When a REV Run Command is given, one of the conditions for the Brake
Release Command (BR) to be activated is that drive output frequency must surpass the value set in this parameter. RRF
should be set to a value smaller than the Brake Delay Frequency BF (S1-03) and larger than both b2-01 (DC Injection
Start Frequency) and E1-09 (Minimum Output Frequency). When operating in CLV control mode without a counter weight,
RRF should be set to zero, and REV Torque Compensation RTC (S1-10) can be increased if slipping occurs at start.
No. Parameter Name Setting Range Default
S1-01
FWD Brake Release Frequency 2.0 Hz
S1-02
REV Brake Release Frequency
0.0 to 20.0 Hz
2.0 Hz