System Runtime; Application-Specific Functions; Calculating The Energy Saving - Siemens Sinamics G110M Original Instructions Manual

Functions

8.9 Application-specific functions

8.8.1

System runtime

By evaluating the system runtime of the inverter, you can decide whether you must replace
components subject to wear such as fans, motors and gear units.
Principle of operation
The inverter starts the system runtime as soon as the inverter is supplied with power. The
system runtime stops when the inverter is switched off.
The system runtime comprises r2114[0] (milliseconds) and r2114[1] (days):
System runtime = r2114[1] × days + r2114[0] × milliseconds
If r2114[0] has reached a value of 86,400,000 ms (24 hours), the inverter sets r2114[0] the
value 0 and increases the value of r2114[1] by 1.
Using system runtime, you can track the chronological sequence of faults and alarms over
time. When a corresponding message is triggered, the inverter transfers the parameter
values r2114 to the corresponding parameters of the alarm or fault buffer.
Parameters
r2114[0]
r2114[1]
You cannot reset the system runtime.
8.9 Application-specific functions
8.9.1

Calculating the energy saving

Background
Fluid flow machines, which mechnically control the flow rate using valves or throttle flaps,
operate with a constant speed corresponding to the line frequency. The lower the flow rate,
the poorer the system efficiency. The machine has the poorest efficiency when the valve or
throttle flaps are completely closed. Further, undesirable effects can occur, for example the
formation of vapor bubbles in liquids (cavitation) or the temperature of the medium being
pumped can increase.
The converter controls the flow rate by appropriately varying the speed of the fluid flow
machine. As a consequence, the fluid flow machine has the optimum efficiency for each flow
rate, and draws less electric power in the partial load range than for closed-loop control
concepts based on valves and throttle flaps.
210
Description
System runtime (ms)
System runtime (days)
SINAMICS G110M Operating Instructions
Operating Instructions, 04/2015, FW V4.7.3, A5E31298649B AD