Operating instructions

Commissioning
4.3 Preparing commissioning
CU240S and CU240E Control Units, FW 3.2
50 Operating Instructions, 03/2009, A5E02440075B AA
What command and setpoint sources are you using?
The command and setpoint sources that are available depend on the inverter. Depending on
whether you use an inverter with or without fieldbus interface, with or without fail-safe
functions, the default command and setpoint sources set in the factory differ.
● Possible command sources [P0700]
– Operator Panel
– Fieldbus (factory setting for bus-capable and fail-safe inverters)
– Local digital inputs/switches (factory setting for non-bus-capable inverters)
● Possible setpoint sources [P1000]
– Motorized potentiometer
– Analog setpoint
– Fixed frequency
– Fieldbus
Controlling motors via terminals
There are various methods to start, stop and reverse the direction of a motor. The various
methods can be configured using parameter P0727.
The following two-wire control versions are available with the factory setting (P0727 = 0):
● Switching on and off with one control command and reversing with the second control
command.
● Switching on and switching off a direction of rotation with each control command.
Minimum/maximum frequency of the motor
The minimum and maximum frequency with which the motor operates or is limited
regardless of the frequency setpoint.
● Minimum frequency [P1080] - factory setting 0 Hz
● Maximum frequency [P1082] - factory setting 50 Hz
Ramp-up time and ramp-down time
The ramp-up and ramp-down time define the maximum motor acceleration when the speed
setpoint changes. The ramp-up and ramp-down time is the interval between motor standstill
and the maximum frequency, or between the maximum frequency and motor standstill.
● Ramp-up time [P1120] - factory setting 10 s
● Ramp-down time [P1121] - factory setting 10 s