YASKAWA CR700, Technical Manual, Page: 201 / 886

Startup
Procedure
and
Test
Run
3
3.10 Crane Application Setup Procedure
YASKAWA SIEPC71061723A YASKAWA AC Drive CR700 Technical Manual 201
Note:
• Under the following conditions, if the output frequency after Soft Start is less than or equal to the brake close frequency, then the drive
will switch OFF the brake release command.
– Both the Forward run command and the Reverse run command are OFF
– The drive is switching between forward and reverse rotation
• Without a Stop command being entered (either the Forward run command or the Reverse run command is still ON), once the frequency
reference fall below the brake release frequency or the brake hold frequency, then the drive will operate at the whichever speed
reference is greater.
Description of Operation
1. Once the Stop command is input (meaning that the Forward run command or the Reverse run command is
switched OFF), the drive will follow b1-03 [Stopping Method Selection] and decelerate to S1-14 [Slip
Prevention Frequency] according to the deceleration time set to the drive.
Note:
The drive will decelerate to Zero Speed when
S1-15 = 0 [Slip Prevention Time = 0.00 s]
.
2. When the output frequency after Soft Start is S1-12 [Brake Hold Frequency (FWD)] or S1-13 [Brake Hold
Frequency (REV)] , the Brake Release Command (BR) shuts OFF, and the Brake Release Check (BX) also
shuts OFF due to the external sequence.
3. The drive operates at the frequency set in S1-14 [Slip Prevention Frequency] for the time set in S1-15 , and
then ramps to stop.
Note:
In the Closed Loop Vector mode, the drive performs Speed Control as it operates at Zero Speed for the stop time set in b2-04 [DC Inject
Braking Time at Stop]
.
■
Switching between Forward and Reverse Rotation
V/f Control, OLV Control
It is not possible to perform continuous operation while switching from forward to reverse or from reverse to
forward without closing the brake. If a Run command is entered that is in the opposite direction that the motor is
currently rotating in, then once the stop sequence has been carried out and the brake has fully closed, the drive
will carry out the start sequence and operate in the opposite direction.
Note:
Refer to Stop Sequence on page 200 for more information about the stop sequence. Refer to Sequence at Startup on page 200 for more
information about the start sequence.
Closed Loop Vector Control
The drive continues operation while switching from forward to reverse or from reverse to forward without closing
the brake. There are case in which the brake closes. Refer to Run Command Minimum On Time Function on page
204 for details. When switching between forward and reverse, the brake will close when frequency reference falls
below
S1-01 [Brake Release Frequency (FWD)]
,
S1-02 [Brake Release Frequency (REV)]
.
■
Brake Open/Close Operation by Speed Reference Input from Terminal A1
By setting
H3-01 = 1 [-10 to +10V (Bipolar Reference)]
, it is possible to open and close the brake using a speed
reference input from terminal A1. The following is a time chart and description of the operation to open and close
the brake.
Note:
• When H3-01 = 0 [Terminal A1 Signal Level Select = 0 to 10V (Lower Limit at 0)] , you cannot open and close the brake using a speed
reference input from terminal A1. With the exception of what is explained in this section, the braking sequences discussed in this
manual presume that the drive has been set so that
H3-01 = 0
.
• When H3-01 = 1 [Terminal A1 Signal Level Select = -10 to +10V (Bipolar Reference)] , the drive will recognize a Stop command that
is entered and execute the sequence to stop the motor, provided that the following 2 conditions are met.
– Frequency reference ≤
b2-01 [DC Injection/Zero SpeedThreshold]
– Frequency reference < E1-09 [Minimum Output Frequency] for more than 100 ms
In this situation, the drive will interrupt output and execute baseblock if a frequency reference is entered that is less than E1-09 ,
regardless of the setting in b1-05 [Operation Below Minimum Freq] .