5-3
5-1 Main Circuit/Control Circuit Power Supply Setting
COMMON PARAMETER SETTING
- SV Series User’s Manual -
Torque Limit at Main Circuit Voltage Drop
After voltage of the main circuit voltage drops, the "Main circuit under voltage warning" (971) will be detected, and the
output current will be suppressed through limiting the torque. Even if supply voltage drops, operation will continue and
will not stop due to the alarm.
The torque when main circuit voltage drops can be limited through a higher-level equipment or servo amplifier.
• Through a higher-level equipment
Higher-level equipment will limit torque when it receives "Main circuit under voltage warning" (971). It will release
torque limit when it receives release signal of "Main circuit under voltage warning" (971).
• Through a servo amplifier
The servo amplifier will limit torque inside the servo amplifier when it receives the "Main circuit under voltage
warning" (971). It will release torque limit according to the "Rel time for trq lim at vol drop" (OTH_28) when it
receives release signal of "Mmain circuit under voltage warning" (971).
Torque limit can be set through parameters when main circuit voltage drops.
Relationship of OTH_27 and OTH_28 is shown below.
Parameter
type
Category
Level Parameter name Setting range
Setting
unit
Default
Enable
timing
OTH_26
Other Special
*Main circuit
voltage drop
0 : Not detect
1 : Warning
2 : Warning and torque limit
-0
After power is
ON again
OTH_27
Trq lim at main circuit
vol drop
0 to 100 % 50
After changing
OTH_28
Rel time for trq lim
at vol drop
0 to 1000 ms 100
Max. torque
Torque T during
normal operation
OTH_27
0%
OTH_28
t
t: Actual release time
T
-
OTH_27
T
MAX
t = x OTH_28
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