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

Products are widely used in metallurgy, petroleum, glass, aluminum manufacturing, petrochemical industry, coal mine, papermaking, printing, textile printing and dyeing, machinery, electronics, automobile manufacturing, tobacco, plastics machinery, electric power, water conservancy, water treatment/environmental protection, municipal engineering, boiler heating, energy, power transmission and distribution and so on.

SAIA PCD2.M110 Signal isolation module

The FLUX reference can be selected by input [FLUX REF SEL] (1004) as follows: The constant 100% flux reference (= 4096 units in software) is selected if input [FLUX REF SEL] (1004) has value 0. Value 1 selects the flux reference from input [FLUX REF] (1002), which is connected to the application program (by means of function blocks in DCS 500B), when there are special requirements from the process point of view. When the motor FLUX is reduced, a larger amount of armature current is needed to create the same torque on the motor shaft. This can be used on some applications, e.g. unwinder section in a winder. Because of a bigger armature current, the resolution of the measurement is better, which helps to control small torques with good accuracy. Normally the FLUX reference is not changed rapidly. For example, on unwinder the FLUX reference follows the diameter of the roll.

Flux Reference in Emergency Stop

 The control range for FLUX is 1:5, so the minimum FLUX reference is 20% of nominal. In case of EMERGENCY STOP, the reduced FLUX reference is changed to maximum possible FLUX reference defined by the field weakening area. EMF reference handling The EMF reference is selected by input [EMF REF SEL] (1005). Value 1 selects the EMF-reference from input [EMF REF] (1003) , which is connected to the application program. Value 0 selects parameter LOCAL EMF REF (1006) as the EMF reference. The scaling of LOCAL EMF REF (1006) is: 100% = U MOTN V PI - controller PI-controller is needed to correct inaccuracies caused by the process, e.g. network AC voltage variations. I-part of the controller is reset below a certain EMF-level because the rotor resistance value IR would otherwise cause an erroneous result.

PI - controller output limitation

 The output of the PI-controller is limited so that 100% of final FLUX reference is the absolute maximum value. The positive level of the PI-controller is limited so that at exactly the field weakening point the positive limit is zero. Above the field weakening point the positive limit starts to increase to facilitate a smooth transfer to the field weakening area.The nominal net voltage is defined in U SUPPLY (507). The upper limit for network undervoltage is defined in % by parameter U NET MIN1 (508). If the network voltage drops below this limit, the controllers are blocked. An undervoltage trip is generated if network voltage is not restored within the time defined by parameter PWR DOWN TIME (510). Scaling 1 == 1 ms.Note. DCS 500B converter module is exactly the same for 400V and 500V supply. Voltage measurement scaling is constant 500V = 4095. U CONV V (10511) signal value must be 500 also for 400V supply (software reads this value automatically from the SDCSPINxx board when C1, C2 or C3 modules are used).