PM Inputs Channel 1/2/3

STATUS

The following useful status information for the respective channel can be read in with the “STATUS” structure.

• Overvoltage (voltage is greater than 415 V)
• Undervoltage (voltage is smaller than 5 V)
• Overcurrent (current is 1.1x greater than the full scale value)
• Phase sequence cw (clockwise-rotating field)
• Phase sequence ccw (counter-clockwise rotating field)
• Missing zero crossing
• TxPDO State
• TxPDO Toggle

Current

Cyclic measurement of the current of the respective phase.

Voltage

Cyclic measurement of the voltage of the respective phase.

Active power

Cyclic measurement of the active power of the respective phase.

Index

Indicates which parameter the “VariantValue” is currently measuring.

VariantValue

There are several parameters behind the VariantValue. It is possible to read in the following values for the respective channel.

• the apparent power
• the reactive power
• the energy
• the power factor λ
• the frequency
• the negative energy
• the angle α of the respective phase to phase L1

The individual parameters are switched over with the help of the respective cyclic output variable “Index”.

Interpretation of output values For time-averaged output values such as RMS values, a markedly longer change of the output value compared to the measuring cycle time can occur in the event of steep signal changes.

Redundant checking of the mains frequency for system control is recommended. The EL34x3 terminals are power measurement terminals. The mains frequency is measured and displayed, but it should not be used as the sole value to control systems. In particular, step changes in the mains frequency can influence the frequency measurement and produce implausible values.

Held frequency

Indices 46 to 48, "Held frequency", indicate the last frequency before an error occurs (Undervoltage, No zero crossing).