HELM

Helm Tonnage Monitors
RLG Series Tonnage Monitor

The RLG series provide press overload protection, die protection, and improved part quality, with minimal operator involvement. The RLG unit takes a sample of the forming force of an ideal part, stores this level in memory and compares each subsequent force level against the ideal. In addition to capacity alarms for overload protection, the TREND LOADGARD features high and low tolerance limits, set automatically for each channel based on a pre-established setting. Three different types or modes of TREND ALARMS are included, which are PEAK TREND ALARMS, ADAPTIVE PEAK TREND ALARMS, and ADAPTIVE AREA UNDER CURVE ALARMS. Digital meters on the front panel are used to display updated “Peak” load values and high/low alarm settings. Machine stop is initiated by means of two separate alarm relays, which fire when certain alarm limits are exceeded.
Features:
● Two Channel, Strain Gage Input
● Built-In Press Capacity Alarms
● 24 Volt DC or 110 Volt AC Power Input
● Three selectable tonnage alarming methods:
    1. High-Low Trend    
    2. Adaptive      
    3.Area Under the Curve
● Analog signal output interfaces
● Three selectable mounting methods
● High precision LED indicators
● Automatic zero adjust
● Real time tonnage display for all channels and total
● Infrared PDA communication, tonnage date is transmitted from RLG unit to PDA device for data
    backup, signal analysis, alarm records and production management
● Ethernet Communication - optional
● Small Rugged Enclosure]

Select the Tonnage Alarming Method for your Application

Trend:

Invented by Helm over 25 years ago, tonnage monitor trend alarming allows you to establish the quality window that the process must operate within Limits are selectable from 5% to 45%, in 5% increments. Once the forming process begins, the Trend alarms are automatically set above and below the sample benchmark value. Machine shutdown is activated if the forming force varies outside the tonnage monitoring range.

Adaptive Learn:

Changes in material thickness, hardness or temper are quickly detected with this tonnage alarming method. Upper and lower limits are continuously adjusted during the production run based on the average tonnage developed over the last 100 machine strokes. Adaptive learn alarming is ideal for high speed forming operations and guarantees precision tonnage control.

Area Under the Curve:

Utilizing Helm signature analysis techniques, this alarming method continuously monitors the energy curve developed while each part is formed. If any area of the forming tonnage signature changes, machine stop is initiated. Area under the curve tonnage monitoring does not require a resolver or other external timing device. Applications include presses performing deep draw or stretch forming operations and machines using nitrogen die cylinders.