Omron SMARTSTEP Junior R7D-ZP, User Manual

Page: 106 / 118

6-4 Overload Characteristics (Electronic Thermal Function)
6-4-1 Overload Characteristics Graphs
6-4 Overload Characteristics (Electronic
Thermal Function)
An overload protection (electronic thermal) function is built into the Servo Driver to protect against
Servo Driver and Servomotor from overloading. If an overload does occur, first eliminate 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 repeatedly at short intervals, the Servomotor
windings may burn out.
The overload characteristics are for a Servomotor with an aluminum heat sink (250
×
250
×
6 mm)
mounted and an ambient temperature of 40°C, so use the Servomotor under these conditions.
6-4-1
Overload Characteristics Graphs
The following graphs show the characteristics of the load rate and electronic thermal
function’s operation time.
R7D-ZP01H Servo Driver (100 W)
Time (s)
Motor torque (%)
Note 1. The motor torque (%) indicates the percentage of the rated torque that is applied.
2. For example, if the motor torque is 300% of the rated torque, an overload alarm will
be generated after about 2 seconds when an R7D-ZP01H is being used.
R7D-ZP02H/-ZP04H/-ZP08H Servo Drivers (200 W to 750 W)
Electronic
thermal
function’s
operation
time (s)
Motor torque (%)
Note 1. The motor torque (%) indicates the percentage of the rated torque that is applied.
2. For example, if the motor torque is 300% of the rated torque, an overload alarm will
be generated after about 3 seconds.
6-11