584
PRACTICAL CIRCUITS
4.16 Operation using stop-on-contact control
function
(A700, E700)
*1
If the setting of the excitation current low-speed multiplying factor at stop-on-contact is too large, an overcurrent (OCT) alarm is liable to
occur.
*2
If the setting of the excitation current low speed multiplying factor is too large, the machine may oscillate in a stop-on-contact state.
*3
Unlike the servo lock function, the stop-on-contact function cannot hold the load for a long time. Stop-on-contact operation continued for
long time can cause the motor to overheat. After a stop, therefore, immediately use the mechanical brake to hold the load.
*4
When an inverter with a regenerative brake resistor is used for cyclic or heavy duty operation, it is recommended to install a magnetic
contactor in the primary side to prevent the brake discharge resistor from overheat/burnout if the regenerative brake transistor is
damaged due to the thermal capacity shortage of the discharge resistor, and excessive regenerative brake duty, etc.
*5
When the power supply is 400V class, install a step-down transformer.
A700
[
Pr. 44
]
([
Pr. 45
])
IM
U
V
W
R
S
T
Earth (Ground)
MCCB
T
F
BR
B
B
C
LSRT
F
R
F
LS
R
F
BR
R
LS
F
R
BR
LS1
LS2
F
STF
R
STR
H
RH
L
RM
LS1
RL
LS2
RT
BR
SD
MRS
P
N
PR
N
P
[
Pr. 6
]
[
Pr. 275
]
[
Pr. 276
]
[
Pr. 44
]
[
Pr. 45
]
RM
RH
RL
RT
ON
ON
ON
[
Pr. 4
]
[
Pr. 5
]
[
Pr. 6
]
0
MC
*4
*5
*3
LSRT
Related parameters
Multi-speed setting (low speed)
Stop-on contact excitation current low-speed
multiplying factor
PWM carrier frequency at stop-on contact
Stop-on contact/load torque high-speed frequency
control selection
Second acceleration/deceleration time
Second deceleration time
Switched to stop-on-contact control mode when both RL and RT turn ON.
(RL and RT may be turned ON in any sequence and with any delay between them.)
Normal mode
Stop-on-contact control mode
Frequency
Power
supply
Stop
PB
Up
PB
Down
PB
Maximum deceleration limit LS1
Maximum deceleration limit LS2
BU
brake unit
Discharge
resistor
Motor
Inverter
Brake
Time
[
Pr. 270
]
B
R
L
S
1
L
S
2
E700
Содержание FR-A700 Series
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