Functions, monitoring, and protective functions
9.2 Drive functions
Inverter chassis units
Operating Instructions, 07/2016, A5E00331449A
441
Setpoint source for essential service mode
When essential service mode is activated, the setpoint which is set via p3881 is switched to:
● p3881 = 0: Last known setpoint (r1078 smoothed) - factory setting
● p3881 = 1: Fixed speed setpoint 15 (p1015)
● p3881 = 3: Fieldbus
● p3881 = 5: TB30/TM31 analog input
● p3881 = 6: Enable of response OFF1
● p3881 = 7: Enable of response OFF2
When using the analog setpoint value from TB30/TM31 (p3881 = 5) the setpoint is used that
is set via p3886.
If, when setting p3881 = 3 or 5, the setpoint is lost (e.g. cable break or fieldbus failure), then
the alternative setpoint that is set via p3882 is automatically switched to:
● p3882 = 0: Last known setpoint (r1078 smoothed) - factory setting
● p3882 = 1: Fixed speed setpoint 15 (p1015)
● p3882 = 2: Maximum speed (p1082)
Direction of rotation in essential service mode
Depending on your system, you may have to invert the setpoint locally for essential service
mode. To do this, parameter p3883 can be linked with a free digital input:
● Signal in p3883 = 0: The direction of rotation of the setpoint parameterized for essential
service mode is maintained
● Signal in p3883 = 1: Reversal of the direction of rotation of the setpoint parameterized for
essential service mode
In essential service mode, if the automatic restart function is activated and the settings of
parameters p1206, 1210 and p1212 then have no effect. The settings in p1211 (automatic
restart, start attempts) and p1213 (automatic restart monitoring time) are still effective. The
setting of p1213 [0] = p1213 [1] = 0.0 s allows an unlimited number of startup attempts.
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