HONEYWELL SPS5713 51199930-100 Voltage channel module

The A1 output from the drive can be used to report errors or drive status conditions to the PLC. Its use is determined by the value held in parameter P37. The output circuit consists of an opto-isolated open emitter, as shown in Figure 4-6. When used with an independent +24V supply the connections are made as shown in Figure 4-6. If you use the drive’s local +24V supply you will need to link X10/16 to X10/10 i.e., the isolated output’s ground connection will need to be linked to 24V ground.The connections made available on X9 are for factory self test, apart from the signals on pins 5 and 6, which can be used to achieve alignment of resolver and motor. For a full description see Appendix C.

Dynamic Braking

 Please note: Part of the information contained in this sub-section has been made available by SEM Limited. In an emergency situation, when the motor needs to be stopped following a drive fault or loss of electrical power, dynamic braking can be used. Dynamic braking is achieved by placing a load across the motor terminals, forcing the motor to act as a generator which will produce a braking torque. Note: this highlights the weakness of dynamic braking, if the motor speed is low, or as it becomes low, dynamic braking loses its effectiveness.

For dynamic braking to be most effective 

it must apply the greatest torque over the maximum motor speed range i.e. it must decelerate the motor as quickly as possible. This is achieved by matching the braking load to the motor being used and the speed range over which it is operating. The motor outputs can be completely short circuited, but this will not achieve the most efficient form of braking as the maximum torque production will occur at too low a speed compared with resistive dynamic braking. In practice, a value of load resistor is selected to give the maximum torque at half the maximum operating speed. This results in a braking torque of more than 80% of the maximum over the top 75% of the motor’s speed range

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