|Overload-Underload Dual Limit Monitor
A Programmable Digital Load Monitor for machinery monitoring, supervision and control.
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the TG226 Load Monitor.
TG226 measures motor power, kW, RMS voltage, RMS current and Power Factor:
- Max. kW limit 1 - overload exception alarm
- Max. kW limit 2 - overload indication alarm
- Dual SPST alarm relays (C1 and C2 is common)
- Start/nuisance trip delay timers
- Optional Hysteresis function on both limits
- Remote Reset and Alarm Blocking
True Digital Design
- no pots, no dials, no screw-drivers.
- 144 samples per cycle at 50 Hz.
- 120 samples per cycle at 60 Hz.
- 4 quadrant digital multiplication.
Ultra Compact DIN Rail Mount
only 1" of rail space.
Current Wire Feeds Through Hole in Unit
Monitor Any Size Motor
(external CT >25Amp.)
peaks up to 75 Amp measured.
High Precision Resolution Measurement
works when amp-meters don’t!
Measures and Displays
kW, kW[%], RMS Voltage, RMS Current and PF(Power Factor)
Peak/Min Capture For All Variables
for accurate limit setting—no guessing.
Limits Programmed in kW[%] or Ture kW
The TG226 is designed for applications where supervision of machine overload is required:
The TG226 is usually used with dual-speed AC-Motors. Only one Max. limit is active for each speed and is selected by the digital input S2 (Speed Select). When speed changes (S2 toggled) a new Start Delay Ts is always activated. The TG226 is for instance used with two speed cranes to prohibit crane overload where each speed needs a different overload limit. Each speed may use a different measurement range CT[A].
The drawing shows a typical AC-motor power curve. The start timer Ts filters out from the regulation the large power surge generated on start-up or motorspeed change; when Ts expires, limits, hysteresis, Tr etc. becomes active.
When power exceeds the Max. Limit1, Tr1 becomes active and when Tr1 expires a max. alarm is generated and relay 1 (C1, NC1) contact is switched open. If power drops back below the Max. Limit1 before an alarm is generated, Tr1 is cancelled. In this example, hysteresis is used to generate an auto reset once the power returns within the hysteresis band.
The drawing only shows the function for one speed (S2 = 0V) but Relay 2 implements the same function on limit 2, selected by applying +12-24V to the input S2.
Note: C1 and C2 is same terminal.