The main products

Spare parts spare parts, the DCS control system of PLC system and the robot system spare parts,

Brand advantage: Allen Bradley, BentlyNevada, ABB, Emerson Ovation, Honeywell DCS, Rockwell ICS Triplex, FOXBORO, Schneider PLC, GE Fanuc, Motorola, HIMA, TRICONEX, Prosoft etc. Various kinds of imported industrial parts

PCH1026 Channel touch point card

To assist in troubleshooting, the state of each switch can be verified using these messages. A separate message displays the status of each input identified by the corresponding name as shown in the wiring diagrams in chapter 2. For a dry contact closure across the corresponding switch terminals the message will read “Closed”.The current time and date is displayed in this message. The PQMII uses an internally generated software clock which runs for approximately thirty days after the control power has been removed. For instructions on setting the clock, see 5.2.6 Clock. The S4 ALARMS/ CONTROL ÖØ MISCELLANEOUS ÖØ CLOCK NOT SET ALARM alarm occurs if power has been removed for longer than thirty days and the clock value has been lost.

A 40-character user defined message is displayed. The message is programmed using the keypad or via the serial port using the EnerVista PQMII Setup Software. See 6.3.4 Programmable Message for programming details Ia/Ib/Ic CREST FACTOR: The crest factor describes how much the load current can vary from a pure sine wave while maintaining the system’s full rating. A completely linear load (pure sine wave) has a crest factor of (1 /0.707), which is the ratio of the peak value of sine wave to its RMS value. Typically, the crest factor can range from to 2.5.

Power Analysis

The Transformer Harmonic Derating Factor (THDF), also known as CBEMA factor, is defined as the crest factor of a pure sine wave ( ) divided by the measured crest factor. This method is useful in cases where lower order harmonics are dominant. In a case where higher order harmonics are present, it may be necessary to use a more precise method (K-factor) of calculating the derating factor. This method also does not take into consideration the losses associated with rated eddy current in the transformer. The EnerVista PQMII Setup Software provides the K-factor method of calculating the derating factor, which is defined on a per unit basis as follows: (EQ 6.3) where:I h = RMS current at harmonic h, in per unit of rated RMS load current PHASE A/B/C/N CURRENT THD: These messages display the calculated total harmonic distortion for each current input. • VOLTAGE Van/Vbn/Vcn/Vab/Vbc THD: These messages display the calculated total harmonic distortion for each voltage input. Phase-to-neutral voltages will appear when the setpoint S2 SYSTEM SETUP ÖØ CURRENT/VOLTAGE CONFIGURATION ÖØ VT WIRING is set as “Wye”. Line-to-line voltages will appear when VT WIRING is set as “Delta”. • Ia/Ib/Ic/In MAX THD: The maximum total harmonic value for each current input and the time and date which the maximum value occurred are displayed. The S1 PQMII SETUP \ CLEAR DATA \ CLEAR MAX THD VALUES setpoint clears this value.