Mitsubishi Electric MELDAS MDS-B-SVJ2 Series - Wiring of Contactors

Chapter 2 Wiring and Connection
2-27
2-7 Wiring of contactors
A contactor (magnetic contactor) is inserted in the main circuit power supply input (L1, L2, L3) of servo
amplifier, and the power supply input is shut off when an emergency stop or servo alarm occurs.
When an emergency stop or servo alarm occurs, the servo amplifier stops the motor using
deceleration control or a dynamic brake. The contactors cannot be shut off during deceleration control,
because the regeneration energy (MDS-C1-CV Series) is returned to the power supply, and the power
supply for deceleration must be held. Therefore, the CNC controls the contactors. The CNC confirms
that all axes are stopped, or confirms the dynamic brake operation. Then it outputs a shutoff command
for amplifiers that drive contactors.
If a converter unit (MDS-C1-CV/A-CR) is present when actually wiring the contactor, the drive is from
the converter unit. When a converter unit is not present, the drive is from the vertical axis or the servo
axis having the longest deceleration time constant. Note that the SVJ2-01 cannot control the
contactors unless an option resistor is externally connected.
Give consideration to the above, and examine the contactor drive method in the following order of
priority.
1. Using the contactor control output (MC1) of the converter unit.
2. Driving from the servo amplifier (MDS-B-SVJ2) of the vertical
axis (unbalanced axis).
3. Driving from the servo amplifier (MDS-B-SVJ2) having the
longest deceleration time constant.
CAUTION
1. The contactors cannot be driven other than from an amplifier or converter.
Undervoltage (alarm) may occur if the contactors are shut off at the same
time as an emergency stop occurs.
2. Do not directly shut off the contactors with an external sequence. They may
shut off faster than the emergency stop input, and the input power supply
may be shut off during the deceleration control or vertical axis drop
prevention control. If this happens, an undervoltage alarm will occur, and
deceleration control or drop hold may not be possible. When
double-protecting, use an amplifier external emergency stop input.
(Refer to section "2-9 Wiring of an external emergency stop")
3. When driving contactors with the MDS-B-SVJ2-01, always externally install
a regenerative resistor. If there is no regenerative resistor installed, the
contactor fusion alarm will be incorrectly detected.
No.
Abbrevia-
tion
Parameter
name
Descriptions
SV017 SPEC
Servo
specification
selection
The following parameters must be set when controlling contactors with the MDS-B-SVJ2.
F E D C B A 9 8 7 6 5 4 3 2 1 0
abs vdir mc dmk
bit Meaning when "0" is set. Meaning when "1" is set.
3 mc Contactor control output invalid. Contactor control output valid.
(Order of priority of the contactor drive method)