Single-Channel, 120V 20A, Field Programmable, Over-exited Magnetic Clutch (Coil) Controller, with 1 Positive Trigger Pulse, RS232 Port, and with Integrated Finned Heat Sink
The Si7FPOexCC1-120V-20A is a Single-Channel, Field Programmable, Over-exited Magnetic Coil Controller with one independent positive-edge trigger input that drives a Solenoid (Clutch Coil) operating with a 0V to 120V DC power-supply voltage at a maximum coil-current of 20A. An initial Over-excitation pulse applied to a magnetic coil improves the response time of this device. Typical over-excitation pulse produces 3 to 4 times the normal steady-state coil flux value produced by the PWM sequence that follows this pulse. A magnetic Clutch Coil timing diagram with 6 timing parameter is shown on Fig. 1. In the “Run–Mode”, with Jumper J1 pins short-circuited (J1=Short), the controller waits for an active high (0 to +5V) Trigger event to occur on pin I1 of port CN4. A single Clutch cycle is initiated by a single short trigger pulse and repeated cycles are produced when a +5V High is applied to pin I1 of port CN4. In the “Program-Mode”, with Jumper J1 pins open-circuited (J1=Open), the Clutch Parameters are interactively entered into a nonvolatile memory using ASCII character strings. Each time parameter string entered covers a time-span of 0 to 420ms in 10 micro sec steps. The string format is variable in length ranging from 1 to 5 decimal numbers (0,…,9); and the last character entered is always a Carriage-Return (CR). A typical interactive program sequence output with program prompts is shown on Fig. 2. These parameter strings and programming commands are entered using the pin I1; and the ASCII display response is observed on pin I2 of port CN4. This port uses a modified version of the RS232 serial-data communication standard, where the output-voltage (on pin I2, CN4) ranges from 0 to +5V (rather than the usual -12V to +12V). The serial data input-voltage (on pin I1, CN4) has the standard range of -12V to +12V. The serial data-format is: 9600 Baud Rate, 1 Start-Bit, 8 Data-Bits, 1 Stop-Bit, and no Parity-Bit. This board requires two DC power supplies. A 10V to 13V at 20mA (Vc on connector CN3) to power the microcomputer and the Gate driver; and a second supply (VP, 0 V to 120 V voltage range at 20A max) to supply DC current to the Clutch Coil. This DC source voltage (VP from pin +P to –P) is selected depending on the over-excitation pulse amplitude required (typically 3.5 times normal coil voltage). Snubbing circuits and filter capacitors are included to suppress inductive switching transients. An onboard LED (red) is used to monitor each load-voltage. A small (2.4”x2.3”x0.45”) integrated finned heat sink is included with mounting hardware (as shown on the photograph) to operate at 20A. Higher power-levels can be achieved with more efficient heat-sinks. Please click on this link and read the Board Mounting Instructions and Heat Sink Selection Guide. Typical applications are: Inductive-Plunger Driver, Precision Cutters, etc.
A Typical Application of the Si7FPOexCC1-120V-20A
In this 90V Over-exited Magnetic Clutch application, a single 24V coil is driven by this controller with the pulse sequence depicted on Fig 1. The program parameters are entered by a PC computer using the Microsoft Hyper Terminal Program. The default parameter values are shown on Fig 2. The Magnetic Clutch can be purchase from: www.ogura-clutch.com .
Fig. 1, Timing Diagram of the Si7FPOexCC1-120V-20A in Run-Mode (J1=Short)
Note that the onset of the clutch-voltage (VL1) sequence is synchronous to the positive edge (or rising edge) of the Clutch Trigger Pulse (VI1). The Over excitation pulse-width is always fixed (as selected in the programming mode); and it is independent of the Trigger pulse-duration. However, the N-cycle PWM sequence (that follows this event) is truncated (reset to zero voltage) when the Clutch Trigger Pulse (VI1) returns to zero. This truncation always occurs when the Trigger Pulse (VI1) is shorter than the programmed Clutch ON Phase time. The truncation is synchronous with the falling edge (or negative edge) of the Trigger Pulse (VI1). If the Trigger Pulse is longer than the programmed Clutch ON Phase time, then the clutch voltage (VL1) returns to zero when the programmed Clutch ON Phase time has elapsed; and the next cycle begins.
For RS232 connectivity, click on this blue link and read this Application Note: SigNote on Configuring a LAN-2.
Fig. 2, Parameter Listing of the Si7FPOexCC1-120V-20A in Program-Mode (J1=Open)
Type p to Program, P to List and Esc when Finished
The Current Parameters are:
PWM Cycle: 1Step=1Cycle, Time Values: 1Step=10uS
Clutch Start Delay Time = 00000
Clutch Over Excite Time = 00400
Clutch Low PWM Time = 00020
Clutch High PWM Time = 00010
Clutch Num PWM Cycles = 00512
Clutch End Delay Time = 00000Type p to Program, P to List and Esc when Finished
|Si7FPOexCC1-120V-20A , Dual-Channel, 120V 20A, Field Programmable, Over-exited Magnetic Coil Controller,||
Note: If Buying the Si7FPOexCC1-120V-20A, it is recommended to buy one optional Si25-DB9cable1 , Network Accessory .
|Si25-DB9cable1 , 1m long Network Cable Assembly with 9-pin female DB9 connector.||
Availability: We usually ship in 2-3 business days.
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