8
Installation
Chassis Drives (MM301U, MM311U)
Mounting
Mount the drive with its board in either a horizontal or vertical plane. Four 0.188 inch (4.8
mm) wide slots in the chassis accept #8 pan head screws.
The chassis units do not have to be earth grounded. If you choose to ground the chas-
sis, use a star washer beneath the head of at least one of the mounting screws to pen-
etrate the anodized chassis surface and to reach bare metal.
Drive components are sensitive to electrostatic fields. Avoid contact with the circuit
board directly. Hold the drive by the chassis only.
Protect the drive from dirt, moisture, and accidental contact. Provide sufficient room for
access to the terminal block and calibration trimpots.
Mount the drive away from other heat sources. Operate the drive within the specified
ambient operating temperature range.
Prevent loose connections by avoiding excessive vibration of the drive.
Observe the following guidelines when installing an isolation transformer:
• A power disconnecting device must be installed between the power line and primary
of the transformer.
• If the power disconnecting device is a circuit breaker, the circuit breaker trip rating
must be coordinated with the in-rush current (10-12 times full load current) of the
transformer.
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