Using Inverters For Elevating Machines; Brake On/Off Sequence - YASKAWA Varispeed G7 Series Instruction Manual

Using Inverters for Elevating Machines

This section describes precautions to be observed when using the Varispeed G7 for elevating machines
such as elevators and cranes.
IMPORTANT


Brake ON/OFF Sequence

Brake ON/OFF Sequence
For the holding brake's ON/OFF sequence, use the following Inverter output signals according to the set con-
trol method.
Control Method
V/f with PG (A1-02 = 1)
Open-loop vector 1 (A1-02 = 2,
Flux vector (A1-02 = 3)
IMPORTANT
* 1. This example shows multi-function output terminals M1-M2 used for the holding brake ON/OFF signal.
Do not set H2-01 to 0 (During run).
* 2. This is the standard setting range for open-loop vector 1 control. For V/f control, set to approximately the motor rated slip frequency +0.5 Hz.
If the set value is too low, the motor torque is insufficient and the load may slip when the brake is applied. Be sure to set L4-01 to a value larger than that
of E1-09 (Min. output frequency) and larger than that of L4-02 shown in Figure 6.86. If the set value is too large, the motor may not run smoothly when
it starts running.
* 3. The hysteresis in frequency detection 2 can be adjusted (from 0.1 to 0.5 Hz) by L4-02 (speed agree detection width). Change the setting to approxi-
mately 0.1 Hz if there are drops while stopping.
* 4. Applicable for G7-Series Inverters with software versions PRG 1038 and later.
* 5. When using frequency detection 2, set L4-01 before H2-01. If H2-01 is set before L4-01, the holding brake will engage while stopping. For Inverters
with software versions PRG 1038 and later, use frequency detection 5 in which a holding brake signal is OFF when the Inverter is baseblocked.
Output frequency
Frequency detection 2
-172
6
When performing trial operation, enable Current alarm function (L8-41 =1), and be sure to make adjustments
to the braking sequence by using Peak hold functions (refer to Current Alarm Function and Peak Hold Cur-
rent Monitoring Function in Chapter 6 ) so that the startup current is less than 150% of the Inverter rated cur-
rent.
Signal Name
Frequency detec-
V/f (A1-02 = 0)
Frequency detec-
factory setting)
During run 2
Do not set Open-loop vector 2 for use in elevating machines.
L4-01
Brake ON/OFF Signal
*1
Constant
*5
H2-01 = 05
tion 2
*5
H2-01 = 36
*4
tion 5
H2-01 = 37
ON
Fig 6.86
Brake ON/OFF Level Adjustment
Signal Name Constant
• L4-01 = 1.0 to
• Speed agree
detection level 3.0 Hz
• Speed agree • L4-02 = 0.1 to
detection width
0.5 Hz
Zero-speed level b2-01 = 0.1 to
(OFF timing only) 0.5 Hz
L4-02
Time
OFF
*2
*3