SMCW6150 Datasheet, PDF (15/16 Pages) celduc-relais – Solid State Relays For Motor Control

celduc^®
relais
Solid State Relays
For Motor Control
S/MOT/SMCW6150/A/22/07/99
1W240020
Page 15/16
INSTALLATION
ADVISES FOR THE SETTINGS
ATTENTION
Obtaining a particular starting time value is only a consequence of the motor torque reduction and can not be
guaranteed or easily repeatable. The rotary switch « Time (s) » setting values only give the duration of the voltage ramp
applied to the motor but not necessarily its starting time. The main SMCV function is to obtain a motor torque reduction to
take care of the motor load and the electric grid. The motor starting time is only a consequence and completely depends on
the motor itself, its load and the settings done by the user.
The SMCV can not break a motor driving a load that has much inertia. The user can only obtain a stop time equal
or longer than a simple disconnection from the electric grid. Using the softstop feature can only be justified when the motor
load tends to break the motor (pumps, …) or when the products treated by the machine need to be stop slowly
(conveyors,…). In the case of load with high inertia, the softstop feature can help to reduce slowly the magnetic field inside
the motor to avoid long time overvoltage in the circuit.
Setting Examples
Direct On Line Starting (DOL)
Long Starting Time For lamps,
Transformers, …
(On a motor, it may hum)
Advise Settings
For Testing The Motor Starting
or
et
et
Loads With Increasing Torque Like N²
And Increasing Power Like N
Load Examples
Advised Time Setting
Fans
Centrifugal Pumps
…
Torque Curve
C
Depending on the user
starting time requirement
Advised Torque Setting
Adjusted to avoid
the motor to hum
Loads With Decreasing Torque Like 1/N
And Constant Power
Load Examples
Advised Time Setting
Winding material around a
shaft (cable, paper, metal,
textile, plastic, …)
Chip disposal
…
Torque Curve
Maximum (64s)
Advised Torque Setting
C
Depending on the user
starting current requirement
Softstop
Softstop
½ of the starting time
(Magnetic field reduction)
N
Loads with Constant Torque
And Power Increasing Like N
Load Examples
Advised Time Setting
½ of the starting time
(Magnetic field reduction)
N
Loads Increasing Like N
And Constant Power
Load Examples
Advised Time Setting
Conveyors, cranes, constant
volume pumps,
…
Maximum (64s)
Machine tools,
Rolling mills,
…
Torque Curve
Advised Torque Setting
Torque Curve
C
Depending on the user
C
starting current requirement
Depending on the user
starting time requirement
Advised Torque Setting
Adjusted to avoid
the motor to hum
Softstop
Depending on the user
stopping smoothness
N
requirement
Softstop
Depending on the user
stopping smoothness
N
requirement