3. SIGNALS AND WIRING
3 - 27
3.7.3 Hot line forced stop function
POINT
When the power supply of the servo amplifier is shut off during deceleration to a
stop by a hot line forced stop signal, the servo motor will be stopped with the
dynamic brake.
For using the hot line forced stop function with MR-JE-_B servo amplifier and
MR-J4-_B servo amplifier together, refer to app. 8 for the hot line forced stop
function of MR-J4-_B servo amplifiers.
(1) Summary
The hot line forced stop function enables all servo motors to decelerate to a stop safely if an alarm
occurs in a system configuration using MR-JE-_B servo amplifiers.
Since the power supply of the MR-JE-_B servo amplifier is commonly used for main circuit and control
circuit power supplies, if the power supply is shut off at occurrence of an alarm, servo amplifiers in which
the alarm occurred and later cannot communicate with the controller. Thus, if an alarm occurs, the
function outputs hot line forced stop signals to all servo amplifiers before a communication to the
controller is cut. Then, servo amplifiers will be in the [AL. E7.1 Controller forced stop input warning] state
and will be stopped safely. Also, the function can be disabled with a parameter.
(2) Parameter setting
The hot line forced stop function is enabled at factory setting. Setting "_ _ _ 1" in [Pr. PA27] disables the
function.
(3) Operation description
If an alarm occurs in the second axis servo amplifier in a 4-axis system configuration, the operation will
be as follows.
Controller
Alarm
occurrence
Deceleration
to a stop (c)
Deceleration
to a stop
Deceleration
to a stop (d)
Deceleration
to a stop (d)
Hot line forced stop signal transmission (b)
Hot line alarm signal transmission (a)
The first axis
MR-JE-_B
The second axis
MR-JE-_B
The third axis
MR-JE-_B
The fourth axis
MR-JE-_B
(a) The servo amplifier in which an alarm occurred transmits the hot line alarm signal to the controller.
(b) Upon receipt of a hot line alarm signal, the controller transmits hot line forced stop signals to all
servo amplifiers.
(c) Upon receipt of a hot line forced stop signal from the controller, [AL. E7.1 Controller forced stop input
warning] will occur in the servo amplifier, and normally operating servo amplifiers will enable the
servo motors to decelerate to a stop. "E7.1" will be shown on the display of the servo amplifier.
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