Curves; Trip Class "P - Grundfos MP 204 Montage- Und Betriebsanleitung

13. Curves

13.1 Trip class "P"

Current
Rated motor
current
Fig. 20 Curves for trip class "P"
The trip delay indicates the maximum period of time
during which the overload condition is allowed to
exist, for example 5 seconds.
Example
A pump is to cut out after 900 ms because the rated
current has been exceeded.
• Select trip class "P".
• Set the overload limit to 10 A (the rated motor
current is stated on the nameplate).
• Set the trip delay to 900 ms.
Figure 20, curve 1:The pump has an abnormal
startup time, and the current exceeds 10 A. MP 204
trips after 900 ms.
Figure 20, curve 2:The pump has a normal startup
time, and the current exceeds 10 A only briefly
(< 900 ms). MP 204 does not trip.
The curves are examples and cannot be used for
readings.
22
Trip delay
1. Curve with tripping
2. Curve without tripping
Time