Eaton PowerXL DC1 Series - Motor Current Monitoring

7 Applications
7.6 Motor current monitoring
130 DC1 variable frequency drive 12/13 MN04020003Z-EN www.eaton.com
7.6 Motor current monitoring
Desired options (example):
• Relay output K1 should output an alarm message if there is a 10% over-
current.
• Analog output AO should show the rated motor current within a range of
0 to 10 V for more precise monitoring (5 V = motor rated current (P-08)).
Figure 82: Example: overcurrent monitoring
Error message: I.t-trP
If the motor (I
e
= 1.9 A) from  Figure 9, page 22 is used as an example,
relay K1 will switch as soon as the motor draws a current of 2.09 A. The
analog output will output a voltage of 5.5 V.
The variable frequency drive will then switch off automatically due to an over-
load (I
e
> 100%).
9
0 V
A-Out
10 11 1
+24 V Out
< 100 mA
6 A, 250 V AC 5 A, 30 V DC
8
0...+10 V
20 mA
P-18 = 5
P-19 = 110
P-25 = 9
+
-
+
-
PNU ID Access rights Value Description DS
RUN ro/rw
P-18 146 ✓ rw K1 signal (Relay Output 1) 0
Used to select the function assigned to the relay output.
The relay has two output terminals: Logic 1 indicates that the relay is
active: This is why terminals 10 and 11 are connected to each other.
Output terminals; logic 1 indicates that the relay is active.
0 RUN, enable (FWD, REV)
1 READY, variable frequency drive ready for operation
2 Output frequency = frequency reference value
3 Error message (variable frequency drive not ready)
4 Output frequency ≧ limit value (P-19)
5 Output current ≧ limit value (P-19)
6 Output frequency < limit value (P-19)
7 Output current < limit value (P-19)