PressCam 8 Tonnage
Screen
The Tonnage Load Monitoring (TLM) I/O load
module is designed for critical force measurement
applications where accuracy, extreme stability, and
dependable noise rejection is essential. The module
is a load measurement device without a display or
alarms. The TLM is used as an input device to the
PressCam 8 providing display and alarm control
functions.
The TLM has high sensitivity levels that
work well in an electrically "noisy" environment.
It has two amplifier gain ranges (span ranges).
Therefore, it can accept either weak or strong signals
from the load sensor. Visit our Tonnage Glossary
below for detailed more information on tonnage
features and terms.
+ Tonnage Glossary
Alarm. A reading that is out of the high or low limit range causing the relay to de-energize. Once alarmed, the relay opens to stop the presss/machine.
Balance. The balance adjustment equalizes the sensor to the tonnage load monitor. the balance point is used to bring the display to zero.
Calibration Number. The process in which the Tonnage Monitor mounted on the machine is adjusted to read the same tonnage as the reference load cells in the bed of the press.
Cam Input. A switching input to the unit allowing tonnage to be read at a certain poisition in the stroke. It is usually obtained from a rotary cam wheel or a programmable limit switch. (Only 24 VCD devices.)
Compression. The force generated by the sensor or load cell by compressing. It is usually found in the rear of a C-Frame press or on a Pitman arm.
Gain/Span. Gain, also called Span, is the amplification used by the monitor. A small amount of elongation of the sensor needs a large amount of gain to show a high reading. The gain is adjusted during calibration.
Reverse Load. The snap through or damaging negative forces occuring in the machine. Typically, the snap through rating is 10% of the capacity of the press.
Shut Height. The distance from the top of the bed of the press to the bottom of the ram when on BDC. Most OBI/OBS presses have a shut height of approximately fifteen inches and a ram adjust of approximately four inches.
Track Mode. When using the track mode, the output will adjust between 0 and 9 VDC. The value goes back to OV when there is no load.
Peak Mode. When using the Peak Mode the output will hold the highest force seen during the time the probe switch is on. Most PLC units use this mode.
Tonnage Features
- Signal conditioning module for
strain gauge sensors and load cells
- Four independent channels for
accommodating up to eight sensors
- For use with full-bridge sensors
from 120 Ohms to 1,000 Ohms
- Plug-in connectors are used for the
sensor inputs
- High/low sensitivity span ranges
selected with front panel switch
- Automatic zero balance circuits
assure accurate measurements
- Power input/output are plug-in
connectors
- Built-in automatic peak load memory
circuits
- Peak measurements are made with an
external trigger device
- Built-in power supply for stable
operation and noise rejection
- Compact size to fit almost any
location
- Steel enclosure for maximum
protection and noise rejection
Specifications
Transducers Full
Bridge, 120 Ohms to 1,000 Ohms. One to four channel
version available. Maximum of two 350 Ohms sensors per
channel.
Dimensions 2"
(51mm) x3.1" (79mm) x 8.95" (227mm)
Balance Range +/- mV/V of
offset
Gain - Two
Ranges
Low=100 to 1,100 adjustable
High=1,000 to 11,000 adjustable
Output Range
Approximately +/- 10VDC at 12VDC excitation
Circuit Accuracy
Maximum inaccuracy of +/- 1% of full scale
Circuit Linearity
Maximum non-linearity +/- .1% of full scale
Auto Zero Time
Constant 10 seconds
Frequency Response
Flat DC to 1KHz
Peak Decay Less
than 1% of full scale in 10 minutes
Calibration Shunts
1 Meg Ohm, .1%
Input Power
100 to
130 VAC 50-60 Hz. Fused at .10 Amp.
200 to 260VAC 50-60 Hz. Fused at .05 Amp.
Input is jumper selectable. Fuses are 5mm x 20mm
SLO-BLO.
Sensor Excitation
Internally excited at +12VDC, .30 Amps maximum
Sensor Input
Connections Four pin .2" (5mm) centers Phoenix
connector
Peak Output
Connections Six pin.2" (5mm) centers Phoenix
connector
Proximity Probe 12VDC
internally supplied to drive NPN or PNP probes, 50mA
max. Input also supports dry relay
contacts.
Print this page
| 
