Fairford Electronics QFE Series, Руководство пользователя

Страница: 109 / 194

Tech Hints
General
Category
3 10/07/2002 Motor configuration
If the motor starts ok but stalls as soon as a load is applied then check the configuration of the motor,
i.e it may be that the motor is meant to be connected in delta but is actually connected in star
No : Date : Subject :
4 23/08/2002 Thermistor(1)
Thermistors are non linear devices, An analog input has been used to monitor the thermistor, with
no thermistor connected the parameter will read 255, with a cold thermistor the value will be low or
zero but with an over temperature thermistor the value will be high or 255.
No : Date : Subject :
9 10/09/2002 Kick Start
Kick start is not always suitable for use with rolling starts or very light loads.
No : Date : Subject :
12 05/11/2002 Fuse Bodies
Smaller Fuse bodies can age worse with repeated starts.
No : Date : Subject :
15 02/09/2003 Modbus
From Software version 55.00 circuit board comms is by a subset of the modbus protocol.
No : Date : Subject :
16 02/09/2003 Enable and Disable
From Software version 55.00 enable and disable modes are introduced, the unit must be disabled to
save to permanent store etc.
No : Date : Subject :
17 02/09/2003 Slip ring motors 1
When sizing a single stage of resistors for use with a soft starter, care must be taken to balance the
standstill torque requirements against large slips at full volts.
No : Date : Subject :
18 02/09/2003 Slip ring motors 2
Slip rings may be shorted at part voltage by forcing a user current limit at start, then using the current
limit timeout flag to control K2 and hence the shorting contactor.
No : Date : Subject :
20 02/09/2003 Commissioning 1
It is a good idea to start by using one of the standard applications.
No : Date : Subject :
22 02/09/2003 Sizing Starters
Starters may need to be de-rated for high start frequency, current, ambient temperature, altitude or
long starts.
No : Date : Subject :
03 September 2003 Page 1 of 3