Siemens SINAMICS PERFECT HARMONY GH180 Function Manual page 212

Operating the Control
7.9 Input Side Monitoring and Protection
Inverse Time Curve
The following figure shows the inverse time-to-trip curves as a function of calculated drive losses
for liquid and air cooled drives. Each plot shows two curves: one is used when the drive is in the
idle state, i.e. medium voltage is applied, but the motor is not being operated; the other is used
when the drive is in the run state, i.e., a slightly longer time to trip.
Figure 7-20 Inverse Time-to-trip Curves
Internal Threshold
The internal threshold is a function of the rated drive input power. For example, in the run state,
the internal threshold is given as:
Internal Threshold (Watts) = 0.07 * rated Drive Input Power
Where:
• Rated input voltage (ID 2010) and Rated input current (ID 2020).
Parameters for Excessive Drive Losses Protection
The running and idle setpoints can be adjusted separately via parameters.
Refer to Input Protect Menu (7000) in Section Options for Drive Protect Menu (7) of Chapter
Parameter Assignment / Addressing for the parameters to set up excessive drive losses
protection. The associated parameters are:
• Excess loss idle (7084)
• Excess loss running (7086)
210
= 0.07 * √3 * Rated Input Voltage * Rated Input Current
NXGPro+ Control Manual
Operating Manual, A5E50491925A