Siemens MCC-3298 - Manual (Page 9)

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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.
2.1 Receiving 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 2-1 shows 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.)