YASKAWA Z1000U Series Quick Start Manual page 35

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MEMOBUS/Modbus Termination
This drive is equipped with a built-in termination resistor for the RS-422/RS-485 communication port. DIP switch S2 enables
or disabled the termination resistor as shown in
be placed to the ON position when the drive is the last in a series of slave drives.
S2 Position
ON
OFF
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Enable the Internal EMC Filter
Drive models ZooEoooo/ZooWoooo have a built-in EMC filter. Move the EMC filter screw to enable (ON) and
disable (OFF) the EMC filter.
DANGER! Electrical Shock Hazard. Do not touch SW screw while power is applied to the drive. Failure to comply will result in death or
serious injury.
WARNING! Electrical Shock Hazard. Connect the ground cable correctly. Failure to comply may result in death or serious injury.
NOTICE: When disabling the internal EMC filter, move the screws from ON to OFF and then tighten to the specified torque. Completely
removing the screws or tightening the screws to an incorrect torque may cause drive failure.
NOTICE: Prevent Drive Damage: Install the two EMC filter screws in the same position (ON and ONE, or OFF and OFF). Failure to comply
may result in serious damage to the drive.
NOTICE: Prevent Drive Damage: Install the EMC filter screw in the OFF position. Installing the EMC filter screw disables the internal EMC
filter in the network is grounded as follows. Failure to comply may result in serious damage to the drive.
• Floating network
• High impedance grounded network
• Asymmetrically grounded network
Use size M4 internal EMC filter screws with 1.0 to 1.3 N•m tightening torque.
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Asymmetrical Grounded Network
Table i.18 shows asymmetrical grounded networks. Asymmetrical networks require first moving the SW screw to disconnect
the internal ground connection. (Drives are shipped with the SW screw installed at the OFF position.)
Characteristics
Grounded at the corner of the delta
Grounded at the middle of the side
Single-phase, grounded at the end point
YASKAWA ELECTRIC TOEP C710636 11E Z1000U HVAC MATRIX Drive Quick Start Guide
Table i.17. The OFF position is the default. The termination resistor should
Table i.17 MEMOBUS/Modbus Switch Settings
Internal termination resistor OFF (default setting)
Table i.18 Asymmetrical Grounded Network
Description
Internal termination resistor ON
Diagram
L3
L3
i.4 Electrical Installation
L1
L2
L1
L2
L1
N
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