G32J-CA20 Omron, G32J-CA20 Datasheet - Page 8

• Manufacturer Part Number: G32J-CA20
• Description: AUXILIARY CONTACT BLCOK 2NO
• Manufacturer: Omron

Specifications of G32J-CA20

• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• Other names: G32JCA20

Operation
■ Operating Modes
Soft Start
A soft start is used to reduce mechanical shock when starting the
motor. The motor voltage is increased from the initial torque to full
voltage.
The initial torque can be set to 15%, 25%, 35%, or 65% of the locked
rotor torque. The motor voltage is gradually increased during the
acceleration ramp time. The acceleration ramp time can be set to 2 s,
5 s, 10 s, 15 s, 20 s, 25 s, or 30 s. The bypass relay turns ON after
the motor starts.
Current Limit Start
This start mode is used when the maximum starting current must be
limited. During the start time, the thyristor will reduce the motor
terminal voltage to limit the current at startup. During stable
operation, the built-in bypass relay will be ON.
The current limit can be set to 150%, 250%, 350%, or 450% of the
full-load current. The start time can be set to 2 s, 5 s, 10 s, 15 s, 20 s,
25 s, or 30 s.
600%
350%
100%
Starting
torque
100%
Start time
Start t1
Direct input
Current limit start
(at 350% of full-load current )
operation
Stable
operation
Stable
Time
Time
Kick Start
A kick start, or boost, at the beginning of the start mode provides a
current pulse of 450% of the full-load current. The kick start time can
be set to OFF, 0.5 s, 1 s, or 1.5 s. This allows the motor to develop
additional torque at start for loads which may need a boost to get
started.
Some loads that may not start well in soft start mode will start more
smoothly if the kick start is enabled to provide more rotational torque
to the motor. Increase the kick start time one step at a time to
gradually increase the initial torque.
The current will increase temporarily during the kick start, but the
start mode that was selected will continue after the kick start has
been completed.
When the current limit start function has been enabled, the kick start
will be disabled.
Note: Refer to DIP Switch Settings on page 11 for details.
Soft Stop
A soft stop is used with applications that require an extended coast
to stop. When enabled, the voltage ramp down time can be set to
one, two, or three times the start time. The motor will stop when the
motor voltage drops to the point where the load torque is greater
than the motor torque.
Start Time for a Soft Start or Current
Limit Start
A built-in current transformer (CT) is used to detect the motor
current. The completion of motor startup is determined by detecting
the convergence of the current as the speed of the motor increases.
The Soft Starter operation is then changed to stable operation. The
start time given here is a guideline for when the total load current set
on the overload FLA setting dial and the actual load current are the
same. If the motor load is smaller, the motor will start faster, so that
actual start time will be shorter than the start time given here.
Soft Stop Time
The soft stop function gradually reduces the motor voltage to prevent
the motor from stopping suddenly under a large load. A built-in CT is
used to detect the motor current and size of the current is used to
determine the size of the load and the rate at which the voltage is
reduced. If the motor load is extremely small, the soft stop time will
be very short.
*1. Initial Torque Setting for Soft Start
*2. Kick Start
Starting
torque *1
100%
Start t1
Kick start t2
operation
Stable
Kick start
(when selected) *2
Start t1
Coast
to stop
Soft-stop t3
operation
Stable
Time
G3JA-C
Time
8