YASKAWA Z1000 User's Manual Supplement page 17

6.4 Installing Peripheral Devices
4A0480
4A0515
4A0590
<1> Maximum MCCB rating is 15 A, or 200% of drive input current rating, whichever value is larger. MCCB voltage rating must be 600 Vac or greater.
<2> Maximum Time delay fuse is 175% or drive input current rating. This covers any Class J, T, or CC fuse.
<3> Maximum Non-time delay fuse is 300% of drive input current rating. This covers any Class J, T, or CC fuse.
<4> When using semiconductor fuses, Bussmann FWH fuses are required for UL compliance.
<5> Consult factory.
<6> Class L fuse is also approved for this rating.
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Attachment for External Heatsink Mounting
An external attachment can be used to project the heatsink outside of an enclosure to ensure that there is sufficient air circulation
around the heatsink.
Contact a Yaskawa sales representative or Yaskawa directly for more information on this attachment.
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Installing a Motor Thermal Overload (oL) Relay on the Drive Output
Motor thermal overload relays protect the motor by disconnecting power lines to the motor due to a motor overload condition.
Install a motor thermal overload relay between the drive and motor:
• When operating multiple motors on a single AC drive.
• When using a power line bypass to operate the motor directly from the power line.
It is not necessary to install a motor thermal overload relay when operating a single motor from a single AC drive. The AC
drive has UL recognized electronic motor overload protection built into the drive software.
Note: 1. Disable the motor protection function (L1-01 = 0) when using an external motor thermal overload relay.
2. The relay should shut off main power on the input side of the main circuit when triggered.
n n General Precautions when Using Thermal Overload Relays
Consider the following application precautions when using motor thermal overload relays on the output of AC drives to prevent
nuisance trips or overheat of the motor at low speeds:
1. Low speed motor operation
2. Use of multiple motors on a single AC drive
3. Motor cable length
4. Nuisance tripping resulting from high AC drive carrier frequency.
Low Speed Operation and Motor Thermal oL Relays
Generally, thermal relays are applied on general-purpose motors. When general-purpose motors are driven by AC drives, the
motor current is approximately 5% to 10% greater than if driven by a commercial power supply. In addition, the cooling
capacity of a motor with a shaft-driven fan decreases when operating at low speeds. Even if the load current is within the motor
rated value, motor overheating may occur. A thermal relay cannot effectively protect the motor due to the reduction of cooling
at low speeds. For this reason, apply the UL recognized electronic thermal overload protection function built into the drive
whenever possible.
UL Recognized Electronic Thermal Overload Function of the Drive
Speed-dependent heat characteristics are simulated using data from standard motors and force-ventilated motors. The motor
is protected from overload using this function.
Using a Single Drive to Operate Multiple Motors
Set parameter L1-01 to 0 to disable thermal overload protection for the drive.
Note: The UL recognized electronic thermal overload function cannot be applied when operating multiple motors with a single drive.
Long Motor Cables
When a high carrier frequency and long motor cables are used, nuisance tripping of the thermal relay may occur due to increased
leakage current. To avoid this, reduce the carrier frequency or increase the tripping level of the thermal overload relay.
246
YASKAWA TOEP YAISUP 04A YASKAWA AC Drive – Z1000 User Manual Supplement
400 480
450 515
500 590
900
<5>
1000
1100
YASKAWA ELECTRIC TOEP C710616 45B YASKAWA AC Drive – Z1000 User Manual
8 Replace Table 6.2 on page 239
FWH-700A (700)
<5>
FWH-800A (800)
FWH-1000A (1000)
17