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Active essential service mode and selection of "Safe Torque Off"
Using the essential service mode and simultaneously using a Safety Integrated function
can lead to the essential service mode being exited, and can therefore result in death or
severe injury, e.g. when a smoke extraction system fails.
The background is that the motor must continue to run during essential service mode as
long as possible and also must not be shut down by a Safety Integrated function.
• Do not use a Safety Integrated function simultaneously with the essential service mode.
Activation of emergency operation
Emergency operation is activated via a continuous signal on the digital input, which is set as
a signal source using p3880.
Only the digital inputs on the Control Unit are permitted as signal sources:
● r0722.x (high active)
● r0723.x (low active)
x = 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 20, 21
Note
Special features when the essential service mode is either activated or deactivated
Signal p3880 = 1 activates the essential service mode:
• If the motor was switched off by activating essential service mode, the converter switches
the motor on.
• If the motor was switched on by activating essential service mode, the converter switches
the speed setpoint to "ESM setpoint source".
Signal p3880 = 0 deactivates the essential service mode:
• If one of the OFF1, OFF2 or OFF3 commands is active, the converter switches off the
motor.
• If neither OFF1, OFF2 nor OFF3 is active, the converter switches the speed setpoint from
the "ESM setpoint source" to the normal setpoint source.
Note
Emergency operation is not fully functional until one of the following requirements is met:
• p3880 is wired offline; a POWER ON of the CU must then be performed after the
download to the device.
• p3880 is wired online.
Converter cabinet units
Operating Instructions, 11/2017, A5E36652151A
WARNING
Functions, monitoring and protective functions
9.3 Drive functions
555
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