R88A-CAU015S Omron, R88A-CAU015S Datasheet - Page 209

• Manufacturer Part Number: R88A-CAU015S
• Description: POWER CABLE 15M
• Manufacturer: Omron

Specifications of R88A-CAU015S

• Lead Free Status / Rohs Status: Lead free / RoHS Compliant

Application
4-4-4 Overload Characteristics
An overload protection function (electrothermal) is built into the Position Driver to protect against Posi-
tion Driver or Servomotor overload. If a motor overload (A.L17) or temporary overload (A.L18) does
occur, first clear the cause of the error and then wait at least one minute for the Servomotor temperature
to drop before turning ON the power again. If the power is turned ON again too soon, the Servomotor coil
may be damaged.
j Motor Overload (A.L17) Detection
When a uniform load is added beginning with an electrothermal value of 0, the time until the Driver
detects a motor overload is as shown in the following diagram. (Reference value)
Note The initial value for the electrothermal value when the Driver is powered up is set at 90%. This is
Note 1. The load ratio is calculated in relation to the motor’s rated current.
Note 2. The value for “T” is determined individually for each Servomotor model, and indicates the
4-18
A motor overload is detected by first calculating the motor’s heat generation (the electrothermal value)
from the current flowing to the motor.
If 110% of the electrothermal value is exceeded, a motor overload will be detected.
The electrothermal value is displayed by the Monitor Mode’s electrothermal value display (oL).
Detection Method
Detection Time
because of the need to rapidly detect an overload in order to prevent motor burnout. Therefore a
thermal value of about 90% will be displayed even when there is no overload to the motor when
the power is turned ON. As long as there is no overload, however, the electrothermal value will be
gradually decreased, so there is no problem for operation.
Detection time (min)
motor’s burn time constant.
Load ratio (%) =
Motor rated current
Motor current
100
Load ratio (%)
Chapter 4