NTPU 04A & 06A Thermistor Protection Unit

We have segregated our infrastructural facility into several units including packaging unit wherein we meticulously pack our products to ensuring hassle free deliveries. For us making delivery of consignments is easy, as we have a productive logistic network that enables to reach buyers within the promised time.
Features :

• Monitors thermal overload of motors and provides protection
• Microcontroller based system
• Built-in "reset" button
• 1 x SPDT relay output
• LED indication for supply
• DIN rail housing
• LED indication for relay status

Initialization and Settings :

• Thermistor to be monitored are connected to T1,T2,T3,T4 and T0.
• Single Phasing, insufficient cooling, motor overload ,frequency and voltage abnormal .
• Test and Reset Function
• Power Supply is connected to Terminals 6 and 12.
• When the Motor is in range of operating condition All Red LEDs are OFF and Relay
• is energized Terminals 1 and 2 are Closed and 3 and 4 are Open .Red LED is On
• and Relay Terminals 1 and 2 is Open during temperature overload Condition and
• Relay Terminals 1 and 2 in Close. Accidental breaks in the Power Source to
• Thermistor Protection unit is also detected which ensures Final Safe.
• This Thermistor Protection unit activate alarm when probe resistance exceeds 3k + 5%.
• Operating temperature alarm get reseted in resistance lower then 1.5 k,+5% during
• motor cool down.
• Resetting function not enable until resistance reach lower then 1.5 k,+5% which
• ensures motor cool down to its operating temperature.

Operating Conditions :

• Sensor Short :
  
  • Thermistor short circuit is detected by device if resistance is lower than 20 and
  • Red LED blinks and Relay gets de energized and resets Thermistor resistance is
  • greater than 20.
  • Thermistor open circuit detected by device if resistance is greater than 4500 and
  • Red LED blinks and Relay gets de energized

• Sensor Open :
  
  • When Test Key is pressed all Red LEDs are On and Relay is de-energized .
  • When Reset Key is pressed all Red LEDs are Off and Relay is energized