CTC Union SB252 Series User manual

SB252 Series Switch BoxSB252 Series Switch Box
6-12 Channel6-12 Channel
Product ManualProduct Manual

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• Introduction...................................................................3
• Product Description...........................................................3
• Product Dimensions & Diagram................................................4
• Mounting Instructions .........................................................5
• Conduit Entry .................................................................6
• Grounding ....................................................................7
• Installation of Sensor / Signal Input Cable......................................8
• Post Installation Testing ..................................................... 11
• Warranty & Return Information .............................................. 13
T  C

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I
CTC switch box solutions allow for the monitoring of remotely mounted vibration
sensors, which would otherwise be restricted to human access due to safety
considerations.
SB252 Series Switch Box Overview: 6-12 channel boxes, stainless steel
enclosure
The SB252 Switch Box is a common cable termination point for bringing sensor
cables into a switch box for routine data collection with portable data collectors.
The SB252 6-12 Channel Stainless steel switch box is used to convert the two-
conductor input wiring of up to 12 remotely installed accelerometers or piezo
velocity sensors, and/or temperature probes to a switched BNC and a switched
two-pin MIL spec connector for data collection. Input wiring from each sensor
is connected to the outputs via quick-connect or screw terminal blocks. Each
terminal block includes inputs for positive, negative and shield. The shield drain
wire is earth grounded via a ground stud that is mounted to the side of the
stainless steel enclosure.
Rated for NEMA 4X (IP66), the SB252 can withstand harsh environments including
temperatures ranging from -58 to 180 °F (-50 to 82 °C). The box is also resistant
to hose directed fluid and corrosion. A locking latch is installed on the door
allowing the box to be sealed from the elements when not in use.

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P D
Measurement
Location Card
Two-pin MIL
Output Connector
Switch
Quick
Connect
Option
Screw
Terminal
Option
Input Terminal Strip Options
BNC
Output
Connector
Figure 1. Dimensions
Figure 2. Diagram
Front View Side View

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M I
Note: if you have purchased a switch box without cable entries provided, you
should add your own entry prior to mounting the switch box. CTC does not
recommend putting holes in the top of the enclosure due to access and moisture
concerns.
Mounting
Holes
0.31 in./7.95 mm
Figure 3. Switch Box Rear View

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C E
If you are running conduit to your enclosure, ensure the conduit cable entry
enters from the bottom of the enclosure when mounted.
Note: To ensure moisture will not flow into the enclosure, a hole should be drilled
at the lowest point in the conduit to provide drainage for any moisture.
Correct
Figure 4. Conduit Entry for Switch Box
Incorrect
Drill Drain
Hole Here

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G
Ensure the shield ground wire on the SB252 Series Switch Boxes is grounded to
earth ground.
A. Mounting to Earth Ground
When mounting SB252 Series Switch boxes to earth ground (such as an I-Beam),
no additional steps are necessary, as the enclosure is grounded internally.
Figure 5. Proper Shield Grounding Technique

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B. Mounting to non-grounded structure
When mounting the switch box to a non-grounded structure, ensure the shield
ground wire or customer supplied ground wire is tied to a source of earth ground.
Figure 6. Ground Wire Placement
S I
Installation of sensors/signal input cable
1. Feed blunt end through the cable entry at the bottom of the enclosure.
Note: it is recommended that cables are marked on both ends.
For cord grip cable entry, take off the cord grip cover with bushing and run cable
into enclosure, hand tighten cord grip cover to base to prevent damage of cord
grip.

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1. Strip outer jacket of cable back 1¼ in. and remove all of the shielding.
2. Separate the internal wires from the shield and twist the shield.
3. Strip red and black insulation back ¼ in.
Figure 8. Bottom View
Figure 7. Front View
Figure 9. Stripped Wire
(-)
Shield / Drain wire
(+)
4. Locate the appropriate plug, identified by channel number, remove the plug and
install the wires using a small flathead screwdriver. Push Plug back into location.
Orientation is as follows:
a. Red insulated conductor wire is connected to (+).
b. Black insulated conductor wire is connected to (-).
c. Shield drain wire is connected to ground (GND).
d. Depress selected position button to open terminal for respective wire (may
require a mini at head screwdriver).

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5. Insert plug into the appropriate PC board connector and double check to ensure
that the cable is going to the correct channel.
6. Mark the Measurement Location Card located on the inside front cover with a
description of each measurement location.
Figure 10. Connecting Cables to Switch Box
CH1CH2CH3CH4CH5CH6
CH7CH8CH9CH10CH11CH12
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
SENSOR #1
SENSOR #2
SENSOR #3
SENSOR #4
SENSOR #5SENSOR #6
SENSOR #7
SENSOR #8
SENSOR #9
SENSOR #10
SENSOR #11
SENSOR #12
Sensor Inputs
Red = Positive
Black = Common
Grey = Shield (Ground)
CH1CH2CH3CH4CH5CH6
CH7CH8CH9CH10CH11CH12
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
+
-
GND
SENSOR #1
SENSOR #2
SENSOR #3
SENSOR #4
SENSOR #5SENSOR #6
SENSOR #7
SENSOR #8
SENSOR #9
SENSOR #10
SENSOR #11
SENSOR #12
Sensor Inputs
Red = Positive
Black = Common
Grey = Shield (Ground)
Inputs Inputs