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Voltage Measurement of TS4-F Fire Safety Products

  • Updated

This article provides some simple testing methods for TS4-F (Fire Safety) products. 

 

Contents:

 

Signal Quality Test with Safety Voltages

  1. Turn on all inverters (AC = ON & DC = ON)
  2. Disconnect the AC power to the inverter to be tested for signal integrity, while keeping all other inverters ON (Tested inverter will have AC = OFF & DC = ON; all other inverters will have AC = ON & DC = ON)

    • Check RSS transmitter LEDs to verify the transmitter is OFF on the inverter to be tested
    • Open all fuses on the inverter to be tested
    • Put positive probes on positive screw terminal and the negative probes to the negative bus
    • Measure 0.6 V * (#), where # is the quantity of TS4s that comprise a string and document the measurement
    • Verify # correlates with your as-built string count
  3. Turn on tested inverter AC so now all inverters have AC and DC power switched on again.
  4. Move to the next inverter to be tested, then repeat steps 2-4 for all inverters until every inverter in the system has been individually tested.

 

 

Measuring Safety Voltage of Strings

  1. Switch AC to OFF & DC to ON, then OPEN all fuses
  2. Confirm RSS transmitter is OFF by verifying LEDs
  3. Measure the voltage across the positive and negative terminals:
    • Put positive probes on left side positive screw terminal
    • Put negative probes on the bus to the right 

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  4. Document what you measure and confirm the as-built string count correlates with your measurements.

You should measure 0.6 V × (#), where (#) is the quantity of TS4s that comprise a string. 

 

 

Signal Quality Test Results

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Measuring Vmp of Strings/MPPTS

  1. Wait until the array is in sunlight.
  2. Switch AC to ON & DC to ON
  3. Confirm RSS transmitter is ON with LEDs
  4. Measure the voltage across the positive and negative terminals:
    • Put positive probes on left side positive screw terminal
    • Put negative probes on the bus to the right

      mceclip2.png
  5. Document what you measure and confirm the as-built string count correlates with your measurements.

 

You should measure (*Vmp) × (#), where (#) is the quantity of TS4s that comprise a string.

 

 

* Voltage at Maximum Power (Vmp):

The voltage available from the PV Module and/or Tigo TS4-F (MLPE) when they are connected to a load source (like an inverter or charge controller). This value represents the maximum capacity that the module can provide, under standard test conditions. Vmp can be around 70 to 80% of the Voc (Voltage at Open Circuit).

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