Omron SMARTSTEP Junior R7D-ZP, Руководство пользователя

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4-3 Regenerative Energy Absorption
4-3-2 Servo Driver Regenerative Energy Absorption Capacity
•
Since there is an internal capacitor to absorb regenerative energy, the value for Eg1 an
E
g2
+ E
g3
(unit: J) must be lower than the Servo Driver’s regenerative energy absorption
capacity. (The capacity varies depending on the model. For details, refer to 4-3-2 Serv
Driver Regenerative E
If an external Regeneration Resistance Unit is connected, be sure that the average
regeneration power (Pr) does not exceed the external Regeneration Resistance Unit’s
regenerative energy abs
d
o
nergy Absorption Capacity .)
orption capacity (12 W).
4-3-2 Servo Driver Regenerative Energy Absorption Capacity
Amount of Internal Regeneration Resistance in Servo Drivers
The SMARTSTEP Junior Servo Drivers absorb regenerative energy internally with built-in
capacitors. If the regenerative energy is too large to be processed internally, an
overvoltage error is generated and operation cannot continue. The following table shows
the regenerative energy (and amount of regeneration) that each Servo Driver can absorb.
If these values are exceeded, take the following measures.
•
Connect an External Regeneration Resistance Unit (to increase the regeneration
processing capacity).
•
Reduce the operating rotation speed. (The amount of regeneration is proportional to
the square of the rotation speed.)
•
Lengthen the deceleration time (to decrease the regenerative energy produced per
time unit).
•
Lengthen the operation cycle, i.e., the cycle time (to decrease the average regenerative
power).
Servo Driver
Regenerative energy (J) that can be
absorbed by the internal capacitor
R7D-ZP01H 13
R7D-ZP02H 19
R7D-ZP04H 28
R7D-ZP08H 59
4-3-3 Absorbing Regenerative Energy with an External Resistor
If the regenerative energy exceeds the absorption capacity of the R88A-RG08UA
External Regenerative Resistance Unit, connect an External Regeneration Resistor. To
connect an External Regeneration Resistor, remove the shorting bar between the RG-JP
terminals and connect the resistor to the P-RG terminals. Double-check the terminal
names when connecting the resistor, because the External Regeneration Resistance Unit
can be damaged if the resistor is connected to the wrong terminals. (The External
Regeneration Resistance Unit does not conform to EC Directives.)
Note: The External Regeneration Resistor can reach a temperature of approximately 120°C, so
install it at a distance from heat-sensitive devices and wiring. In addition, install a
heat-radiating heat sink to cool the resistor if necessary.
External Regeneration Resistor
External Regeneration Resistor Models
Model Resistance
Nominal
capacity Regeneration
absorption at 120 ° C
Heat
radiation
Thermal switch output
specifications
R88A-RR22047S 47
Ω ±
5% 220 W 70 W
t1.0
×
@ 350
(SPCC)
Operating temperature:
170°C
±
5%
NC contact
Rated output: 3A
4-23