If this memory switch is set to “1” (to clear servo alarm), power loss is not stored as alarm traceback data

DTGON (1CN-9)

DStatus indication mode bit data DMonitor mode Un-05 bit 4 User Constant Setting:

Memory switch Cn-01 bit 4 = 0

3.7.6 Handling of Power Loss

1) Use the following memory switch to specify whether to clear or hold a servo alarm that occurred at power loss.

Cn-01 Bit 5 Operation to Be Performed at

Recovery from Power Loss Factory

Setting: 0 For Speed/Torque Control and Position Control

If the Servopack detects instantaneous voltage drop in power supply, it outputs alarm A.F3 to pre-vent a hazardous situation.

Select the operation to be performed when volt-age is recovered after alarm occurrence.

Setting Meaning

0 Holds servo alarm even after recovery from power loss.

ALM output remains OFF (circuit between 1CN-34 and 1CN-35 remains open).

1 Clears servo alarm after recovery from power loss.

ALM output remains ON (circuit between 1CN-34 and 1CN-35 is closed).

2) If this memory switch is set to “1” (to clear servo alarm), power loss is not stored as alarm

Note Setting Bit 5 of Cn-01 to Clear Servo Alarm:

To change a user constant that is made valid by turning the Servopack OFF and then ON, always wait for at least the “power holding time” after the Servopack is turned OFF, then turn the Servopack ON. Follow the procedure below.

a) Make sure that all indicators (LEDs) on the Digital Operator have gone OFF.

b) Make sure that the power and alarm indicators (LEDs) on the front panel of the Servo-pack have gone OFF.

c) Then, turn the power ON again.

Reason

When bit 5 of Cn-01 is set to “1” (clearing servo alarm), the Servopack will operate nor-mally even if it is turned ON without waiting “power holding time” after being turned OFF.

In this case, however, the inside of the Servopack has not yet been reset (power ON re-set). Therefore, user constants that have been modified do not become valid if these constants are made valid by turning the power OFF and then ON. Although the modified (new) settings appear on the display, the old settings are still valid inside the Servopack.

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3.8 Special Wiring

This section describes special wiring methods including the one for noise control. Always refer to 3.8.1 Notes on Wiring and 3.8.2 Wiring for Noise Control, and refer to other sections as necessary.

3.8.1 Wiring Instructions . . . 136 3.8.2 Wiring for Noise Control . . . 138 3.8.3 Using More Than One Servo Drive. . . 143 3.8.4 Using Regenerative Units. . . 144 3.8.5 Using an Absolute Encoder . . . 148 3.8.6 Extending an Encoder Cable . . . 157 3.8.7 Using SGDA Servopack with High Voltage Line . . . 159 3.8.8 Connector Terminal Layouts . . . 161

3.8.1 Wiring Instructions

To ensure safe and stable operation, always refer to the following wiring instructions.

NOTE Always use the following cables for reference input and encoder wiring.

Cable Type Yaskawa Drawing No. Maximum Allowable Length For reference

input Twisted-pair

cables DE9404859 3 m (9.8 ft.)

For encoder Multiconductor shielded

twisted-pair cable

B9400064 (for incremental encoder)

DP8409123 (for absolute encoder)

20 m (65.6 ft.)

• Trim off the excess portion of the cable to minimize the cable length.

NOTE For a ground wire, use as thick a cable as possible.

• At least class 3 grounding (ground to 100 Ω or less) is recommended.

• Always use one-line grounding.

• If the motor is insulated from the machine, ground the motor directly.

NOTE Do not bend or apply tension to cables.

• Since the conductor of a signal cable is very thin (0.2 to 0.3 mm), handle it with ade-quate care.

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NOTE Use a noise filter to prevent noise interference.

(For details, refer to the following Caution.)

• If the servo is to be used near private houses or may receive noise interference, install a noise filter on the input side of the power supply line.

Since this Servopack is designed as an indus-trial device, it provides no mechanism to prevent noise interference.

NOTE To prevent malfunction due to noise, take the following actions:

• Position the input reference device and noise filter as close to the Servopack as pos-sible.

• Always install a surge absorber circuit in the relay, solenoid and magnetic contactor coils.

• The distance between a power line (such as a power supply line or motor cable) and a signal line must be at least 30 cm (12 in). Do not put the power and signal lines in the same duct or bundle them together.

• Do not share the power supply with an electric welder or electrical discharge machine.

When the Servopack is placed near a high-frequency oscillator, install a noise filter on the input side of the power supply line.

Note a) Since Servopack uses high-speed switching elements, signal lines may re-ceive noise. To prevent this, always take the above actions.

b) For details of grounding and noise filters, refer to 3.8.2 Wiring for Noise Con-trol.

NOTE Use a molded-case circuit breaker (MCCB) or fuse to protect the power supply line from high voltage.

• This Servopack is directly connected to com-mercial power supply without a transformer.

Always use an MCCB or fuse to protect the ser-vo system from accidental high ser-voltage.

• Select an appropriate MCCB or fuse according to the Servopack capacity and the number of Servopacks to be used as shown below.

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Noise filter

MCCB

MCCB or Fuse for Each Power Capacity

Power

Voltage Servopack Type Power Capacity Per Servopack (kVA)

(see note 1)

Power Capacity Per MCCB or Fuse (A)

(see note 2)

SGDA-A3Aj 0.25

SGDA-A5Aj 0.3

5

200 V SGDA-01Aj 0.5 5

200 V

SGDA-02Aj 0.75

SGDA-04Aj 1.2 9

SGDA-08Aj 2.2 16

SGDA-A3Bj 0.2

SGDA-A5Bj 0.3 5

100 V SGDA-01Bj 0.5

5 100 V

SGDA-02Bj 0.75 8

SGDA-03Bj 1.4 15

Note 1) Power capacity at rated load

2) Operating characteristics (25°C): 2 seconds or more for 200%, 0.01 second or more for 700%

3) A fast-operating fuse cannot be used because the Servopack power supply is a capaci-tor input type. A fast-operating fuse may blow out when the power is turned ON.

3.8.2 Wiring for Noise Control