Beckhoff AX2040, Сборка, установка, настройка

Страница: 23 / 111

6.7 Switch-on and switch-off behavior
This chapter describes the switch-on and switch-off behavior of the AX2040/2070 and the steps
required to achieve operational stopping or emergency stop behavior that complies with standards.
The servo amplifier’s 24 V supply must remain constant. The ASCII commands
ACTFAULT (error response) and STOPMODE (ENABLE signal response) dictate
how the drive will behave.
STOPMODE ACTFAULT
Behavior (see also ASCII reference in the online help of the se-
tup software)
0 (default) 0 Motor coasts to a standstill in an uncontrolled manner
1 1 (default) Motor is braked in a controlled manner
Behavior during a power failure
The servo amplifiers use an integrated circuit to detect if one or more input phases (power supply
feed) fail. The behavior of the servo amplifier is set using the setup software: Under “
Response to
Loss of Input Phase ” (PMODE) on the Basic Setup screen, select:
l
Warning if the higher-level control system is to bring the drive to a standstill: Warning n05 is
output if an input phase is missing, and the motor current is limited to 4 A. The servo ampli-
fier is not disabled. The higher-level control system can now selectively end the current cycle
or start bringing the drive to a standstill. Therefore, the error message “MAINS BTB, F16" is
output on a digital output of the servo amplifier and evaluated by the control system, for ins-
tance.
l
Error message if the servo amplifier is to bring the drive to a standstill: Error message F19
is output if an input phase is missing. The servo amplifier is disabled and the BTB contact
opens. Where the factory setting is unchanged (ACTFAULT=1), the motor is braked using
the set “EMERGENCY STOP RAMP”.
Behavior when undervoltage threshold is reached
If the undervoltage threshold is undershot in the DC bus link (the threshold value depends on the
type of servo amplifier), the error message “UNDERVOLTAGE, F05" is displayed. The drive
response depends on the ACTFAULT/STOPMODE setting.
Behavior with enabled “holding brake” function
Servo amplifiers with an enabled holding brake function have a special procedure for switching off
the output stage (
ð
p. 21). Removing the ENABLE signal triggers electrical braking. As with all
electronic circuits, the general rule applies that there is a possibility of the internal “holding brake”
module failing. Bringing a motor to a standstill using a holding brake in a way that is personnel safe
also requires an electromechanical “make” contact for the holding equipment and a suppressor
device for the brake.
Behavior of the restart lock -AS-
With the personnel safe restart lock –AS-, the drive can be secured on standstill using its internal
electronics so that even when power is being supplied, the drive shaft is protected against uninten-
tional restart. The chapter “Personnel safe restart lock -AS-” describes how to use the restart lock
–AS-. See page 69 onwards.
AX2040/2070 Product Manual 23
BECKHOFF
06/2007
Technical description