NOTICE: Use a magnetic contactor (MC) to ensure that power to the drive can be completely shut off when necessary. The MC should be
wired so that it opens when a fault output terminal is triggered.
Note:
1.
Install an MC to the drive input side to prevent the drive from restarting automatically when power is restored after momentary power
loss.
2.
Set up a delay that prevents the MC from opening prematurely to continue operating the drive through a momentary power loss.
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Connecting a Surge Absorber
A surge absorber suppresses surge voltage generated from switching an inductive load near the drive. Inductive loads include
magnetic contactors, relays, valves, solenoids, and brakes. Always use a surge absorber or diode when operating with an
inductive load.
WARNING! Fire Hazard. Due to surge absorber short circuit on drive output terminals U/T1, V/T2, and W/T3, do not connect surge absorbers
to the drive output power terminals. Failure to comply may result in serious injury or death by fire or flying debris.
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Reducing Noise
n
Preventing Induced Noise
Use shielded cables or zero phase reactors and lay the cables at least 30 cm away from the signal line to prevent induced noise.
B
A
C
F
G
E
R/L1
MCCB
S/L2
T/L3
U/T1
V/T2
W/T3
D
M
A – Power supply
B – Drive
C – Shielded motor cable
D – Motor
E – Separate at least 30 cm
F – Controller
G – Signal line
Figure 7.9 Preventing Induced Noise
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Attachment for External Heatsink Mounting (IP00 Enclosure)
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.
Create a sequence to produce an external fault (coast to a stop) when triggered.
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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:
• Low speed motor operation
• Use of multiple motors on a single AC drive
7.5 Installing Peripheral Devices
YASKAWA TOEPYAIUPW01A YASKAWA AC Drive - U1000 iQpump Matrix Drive User Manual
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7
Peripheral Devices & Options