Siemens MCC-3298 user manual Installing the SAMMS-LV Device

2 Installing the SAMMS-LV Device

2 Installing the SAMMS-LV Device

This section provides instructions for installing the SAMMS-LV device. You should adapt these instructions to suit the needs of your installation and equipment.

2.1Receiving and Storing the SAMMS-LV Device

Thoroughly inspect the equipment before accepting the ship- ment from the transportation company. Compare each item received against the packing list and report any shortages or damaged equipment to the carrier.

If you are not going to install the SAMMS-LV device immedi- ately, store it in a clean, dry location at ambient temperatures from -40°C to 85° C. The surrounding air should not contain any corrosive fumes or electrically conductive contaminants. The storage location should prevent condensation from forming within the equipment enclosure.

Note: Improper storage can cause equipment damage. Follow all storage instructions carefully. Failure to follow storage in- structions will void the warranty.

2.2 Where to Locate the Device

You can locate the SAMMS-LV device and its associated devices in most industrial equipment environments. Unless the device is designed for specific requirements, you should install the SAMMS-LV device and its controller in an area where the following conditions exist:

•Ambient air must be free of dirt, combustible vapor, steam, electrically conductive or corrosive material.

•Area around the controller must provide access to the equipment for inspection, maintenance and operation.

2.3 Mounting the Device

The SAMMS-LV device mounts in a front door of Siemens motor control center (MCC), or on the front door of any motor controller.

2.4 Connecting the Device

This section contains general guidelines that you should follow to connect the SAMMS-LV device. These guidelines include instructions for routing the wiring, connecting the wires and grounding the device. Use these guidelines to install the SAMMS-LV device and its peripheral devices in a motor controller. Also use these guidelines to connect the motor controller to the motor.

When Siemens supplies a SAMMS-LV device as part of a motor controller, Siemens personnel install the wiring between the SAMMS-LV device and its peripheral devices in the motor controller at the factory. The schematic diagram used contains three components: a connection diagram, a ladder diagram

and a wiring diagram. The connection diagram illustrates the connections between the SAMMS-LV device and its peripheral devices. The ladder diagram illustrates the control circuit loaded into the SAMMS-LV device. Figure 2-1shows a typical connection diagram for the SAMMS-LV device.

If Siemens does not supply the motor controller, the retrofitter or original equipment manufacturer should develop an equiva- lent electrical scheme.

2.4.1 Wiring Guidelines

You must observe the following guidelines when installing the SAMMS-LV device and connecting it with its peripheral de- vices.

Note: Failure to follow these guidelines can cause pickup of unwanted signals resulting in erratic operation and damage to the SAMMS-LV device.

Guideline 1: Separate the low-voltage (115 VAC or less) from the higher voltage conductors (460 VAC or higher) as much as possible. If low-voltage and medium-voltage wires must cross paths, make sure that they intersect at a right angle.

Guideline 2: To eliminate noise coupling, install all twisted pairs or wrap wires in such a way that a complete twist or wrap occurs at least every two inches.

Guideline 3: Place the low-voltage leads near the controller chassis.

Guideline 4: Use at least AWG 14 stranded copper wire for any low-voltage control wiring that you route outside the motor controller enclosure. Connections to the SAMMS-LV unit must be made with wire no larger than AWG 14.

Guideline 5: To avoid ground loops, ground each motor controller at a single ground point.

The top portion of the device contains 16 terminal locations for connecting control power leads, power supply, ground, inputs and outputs. (Refer to Figure 2.2 for a description of each terminal block assignment.)

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