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PART NUMBER 37545 SMART MONITOR 120VAC 4-20MA OUTPUT
Description:
Smart Monitor 37545 converts rotary shaft speed (RPM) into analog 4-20mA output . This
allows “true-slip” monitoring during the critical ramp-up period of conveyors . The Smart
Monitor 37545 interfaces directly with the customer’s PLC . The Smart Monitor conveniently
mounts inside an existing electrical panel or O .E .M . control box . The aluminum mounting
plate is removable for mounting to DIN rail . The up-front LCD screen conveniently shows the
current RPM in real time .
Installation:
1 . Disconnect AC power before proceeding with installation
2 . Mount the Smart Monitor inside and existing control panel or other suitable protective
enclosure . See Figure A5 .3 for Smart Monitor mounting dimensions .
3 . Table A5 .1 shows connection details for the terminal strip . Make needed connections .
4 . Install Smart Roll . See Section 2: “Installing and Mounting the Smart Roll .”
Set-up and Display Indicators:
When power is applied to the unit, the display will show the following: “000” RPM (Displays
the actual RPM from the remote speed sensor) .
“Line Open” – If displayed, indicates user should check 4-20mA line . 0-500 ohm is
maximum line resistance .
“10-XXXX RPM” – Displays the current speed range . If this is NOT the correct range required
for your installation, you can select from 23 other preset speed ranges by following the steps
below:
1 . Depress and hold the “set” button for approximately 4 seconds . The display will now
change to show ranges from 100 RPM top range to 6000 RPM top range .
2 . Now using the “arrow” keys, select the desired range from the list .
3 . With the correct range “highlighted,” depress and hold the “set” button for approximately
4 seconds . The display will now change back to normal operation with the new RPM
range shown on the screen .
NOTE: If you do not make a selection within approximately 10 seconds, the display will go
back to normal operation and keep the existing speed range .
NOTE: This new model has ALL the “previous style” Smart Monitor speed ranges included in
the firmware, this allows for the models to be replaced without having to change computer
programming .
Application / Speed Information:
All models have a preset low end RPM range of 10 RPM (0 .1666 Hz X 60) .
The following formulas/examples can be used to determine the Frequency
Range (SPAN) and corresponding 4-20mA output at any monitored speed .
1 . Convert top end RPM into a Frequency in hertz (Hz) .
XXXX RPM / 60 = XXX .X Hz
2 . Subtract Frequency in hertz from 0 .1666 Hz (10 RPM)
XXX .X Hz – 0 .1666 Hz = XXX .X SPAN in RPM’s
3 . Divide the SPAN in RPM by 160 = RPM’s per each 0 .1mA increment
of output .
XXX .X RPM / 160 = XX RPM per .1mA output
A6. ADDITIONAL SMART MONITORS
TERMINAL
CONNECTION
FRONT
1
No connection
2
No connection
3
4-20mA Output – Positive (+)
4
4-20mA Output – Negative (-)
5
No connection
6
No connection
7
Sensor Input (+)
8
Sensor Input Common (-)
BACK
9
No connection
10
No connection
11
No connection
12
No connection
13
No connection
14
No connection
15
AC Input (N)
16
AC Input (H)
TABLE A5 .1:
37545 Smart Monitor terminal connections
AVAILABLE TOP END SPEED SETTINGS
SCREEN 1
100 RPM
225 RPM
350 RPM
150 RPM
260 RPM
360 RPM
160 RPM
300 RPM
400 RPM
200 RPM
325 RPM
500 RPM
SCREEN 2 ( )
600 RPM
1200 RPM
4100 RPM
660 RPM
1800 RPM
4500 RPM
800 RPM
2000 RPM
6000 RPM
1000 RPM
2500 RPM
