YASKAWA Sigma-7 SGD7S Series - Page 210

This function can be executed either with the host controller or with the SERVOPACK.
Use Pn008 = n.X (Function Selection for Undervoltage) to specify whether the func-
tion is executed by the host controller or by the SERVOPACK.
The default setting (Pn008 = n.0) disables detection of an A.971 warning (Under-
voltage).
Parameter Meaning When Enabled Classification
Pn008
n.0
(default
setting)
Do not detect under-
voltage.
After restart Setup
n.1
Detect undervoltage
warning and limit torque
at host controller.
n.2
To detect undervoltage
warnings, use Pn424
(Torque Limit at Main
Circuit Voltage Drop)
and Pn425 (Release
Time for Torque Limit at
Main Circuit Voltage
Drop). (i.e., only in SER-
VOPACK).
n Execution with the Host Controller (Pn008 = n.1)
The host controller limits the torque in response to an A.971 warning (Undervoltage).
The host controller removes the torque limit after the Undervoltage warning is cleared.
280 V
200 V
0%
0%
Torque limit ends.
The torque is limited when the
Undervoltage warning is received.
Torque limit starts.
The main circuit bus voltage increases when
the main circuit power supply recovers.
The output torque is limited to suppress
the drop in the main circuit bus voltage.
Torque limit
reference
Undervoltage
warning status
Torque control
A.971 warning
(Undervoltage)
Main circuit
bus voltage
Main circuit input
power supply
Host controller
SERVOPACK
Main circuit power interruption time
Fig. 151: SEMI F47 Function - Execution with the Host Controller
n Execution with the SERVOPACK (Pn008 = n.2)
The torque is limited in the SERVOPACK in response to an Undervoltage warning.
The SERVOPACK controls the torque limit for the set time after the Undervoltage warning
is cleared.
Execution Sequence
Sigma-7 Series SERVOPACKs
Application Functions
SEMI F47 Function
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