Brake Sequence Function - Mitsubishi Electric FR-A820-00046 (0.4K) Instruction Manual

NOTE
• When the start signal is turned OFF before the time set in Pr.137 has passed after the start signal is turned ON, the inverter
does not start and the MC1 signal is turned OFF after the time set in Pr.254 has passed. If the start signal is turned ON again
before the time set in Pr.254 has passed, the inverter immediately starts outputting.
Output frequency
• At inverter reset, the status of the MC1 signal is held and operation of the magnetic contactor is not performed.
• When the inverter stops the output due to, for example, the Output stop (MRS) signal, the MC1 signal is turned OFF after the
time set in Pr.254 has passed.
• During the stop, turning ON the External DC injection brake operation start signal (X13) and Pre-excitation/servo ON signal
(LX) turns ON the MC1 signal.
• To avoid inverter reset when supplying power to the main circuit is started when power is supplied only to the control circuit,
set 100 or more in Pr.30. (For the separated converter type, setting Pr.30 of the converter unit is also required.)
• When supplying power to the main circuit is started when power is supplied only to the control circuit, there is a slight waiting
time before starting.
• Repeated operation of the magnetic contactor due to frequent start and stop or activation of the protective function may shorten
the inverter life.
• Changing the terminal assignment using Pr.178 to Pr.189 (Input terminal function selection) and Pr.190 to Pr.196 (Output
terminal function selection) may affect the other functions. Set parameters after confirming the function of each terminal.
• To use X94 signal for the separated converter type, use a converter unit manufactured in August 2014 or later.
Parameters referred to
Pr.11 DC injection brake operation
Pr.30 Regenerative function selectionpage 689
Pr.190 to Pr.196 (Output terminal function

5.14.3 Brake sequence function

This function outputs operation timing signals of the mechanical brake from the inverter, such as for lift applications.
This function is useful in preventing load slippage at a start due to poor mechanical brake timing and overcurrent alarm in stop
status and enable secure operation.
Pr. Name
278
Brake opening frequency
A100
279
Brake opening current
A101
280 Brake opening current
A102 detection time
281
Brake operation time at start
A103
282
Brake operation frequency
A104
283
Brake operation time at stop
A105
(Hz)
ON OFF
STF
ON OFF
MC1
Pr.137
Pr.254
timepage 681
selection)page 450
Initial Setting
value range
3 Hz 0 to 30 Hz
130% 0 to 400%
0.3 s 0 to 2 s
0.3 s 0 to 5 s
6 Hz 0 to 30 Hz
0.3 s 0 to 5 s
Output frequency
(Hz)
Time
ON OFF
STF
ON
MC1
Pr.137
Description
Set the rated slip frequency of the motor + approx. 1.0 Hz. This can be
set only when Pr.278 ≤ Pr.282.
Set between 50 and 90% because load slippage is more likely to occur
when a start setting is too low.
The inverter rated current is regarded as 100%, or the rated motor
torque is regarded as 100%. (According to Pr.639 setting)
Generally set between 0.1 and 0.3 s.
Set the mechanical delay time until braking eases. When Pr.292 = "8",
set the mechanical delay time until braking eases + approx. 0.1 to 0.2
s.
Turn OFF the Brake opening request (BOF) signal and set the
frequency for operating the electromagnetic brake. Generally, set the
setting value of Pr.278 + 3 to 4 Hz. This can be set only when Pr.282
≥ Pr.278.
When Pr.292 = "7", set the mechanical delay time until the brake
closes + 0.1 s. When Pr.292 = "8", set the mechanical delay time until
the brake closes + approx. 0.2 to 0.3 s.
Time
ON
Pr.254
5. PARAMETERS
5.14 (A) Application parameters
1
2
3
4
5
6
7
8
9
10
541