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Functions
7.9 Application-specific functions
Frequency inverters with Control Units CU230P-2 HVAC, CU230P-2 DP, CU230P-2 CAN
Operating Instructions, 01/2011, FW 4.4, A5E02430659B AD
253
You will find additional details on this in the List Manual in the function diagrams for essential
service mode, setpoint channel and technology controller.
When in the factory setting, if the setpoint is lost, the drive continues using the last
recognized setpoint. p3882 can be used to switch to the following values:
●
P3882 = 0: Last recognized setpoint (factory setting)
●
p3882 = 1: Fixed speed setpoint which is defined in p1015
●
p3882 = 2: Maximum speed (value of p1082)
Note
Technology controller as setpoint source for the emergency operation setpoint
For the technology controller to be able to specify the emergency setpoint, it must be
activated (p2200 = 1) and set as the main setpoint (p2251 = 0).
Direction of rotation in the essential service mode
●
Emergency setpoint using p3881 = 0, 1, 2, 3
Depending on your system, you may have to invert the setpoint locally for the essential
service mode. The customer can therefore use p3883 to determine the direction of
rotation of the emergency setpoint. To do this, p3883 must be linked with a free digital
input, e.g. p3883 = r722.12.
–
p3883 = 0 -> normal emergency direction of rotation,
–
p3883 = 1 -> inverted emergency direction of rotation.
●
Emergency setpoint using p3881 = 4
If the emergency setpoint is specified using the technology controller, it is depicted using
variables within the process and depends on these. Inversion using a digital input is
therefore locked in such cases and must be implemented in the technology controller.
Bypass operation in the essential service mode
●
If the motor is running in bypass operation when the emergency happens, the user must
query the "Bypass control/status word" (r1261) and make an appropriate interconnection
to ensure that the motor is switched to the inverter and continues to run with the
emergency setpoint.
●
If the inverter has failed in the essential service mode because of an internal fault and if it
cannot be switched back on using the automatic restart function, the user can
interconnect bit 7 of the status word for the automatic restart (r1214.7) with p1266 to
operate the motor directly on line. You will find additional information about bypass
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