Rockwell Automation Allen-Bradley Guardmaster 440R-S35011, Руководство пользователя

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Rockwell Automation Publication 440R-UM014D-EN-P - December 2019 37
Troubleshooting Chapter 8
If an open circuit is detected, trace the wiring from the MSR55P safety relay to
the motor connection, to determine where the open circuit exists.
Figure 21 - Measure the Motor Resistance
Feedback Circuit Open
(Step 4)
The circuit between terminal X1 and X2 is open.
With motor turned OFF, measure the resistance between X1 and X2. The
resistance must be close to 0 Ω. If the resistance shows an open circuit, trace the
circuit through the components to find the open circuit.
If the circuit is closed (measures 0 Ω), try cycling the power to the MSR55P
safety relay. If the ERR continues to show four flashes, then replace the
MSR55P safety relay.
Figure 22 - Measure the Resistance in the Feedback Circuit
L1
L2
L3
53 54 L1 L2 L3
X1 X2 X3 11 23 33 43
12 24 34 44
A3 A4 ON ERR A1 A2
OUT
ERR
PWR
.2 .4
.7
MSR55P
1
1.5
2 3
4
.5
.3
.2 .4
.7
ts
Vm
1
1.5
2 3
4
.5
.3
33 23 11 43 53
34 24 12 44 54
37.5
Ohms
DMM
Acceptable Range
Motor winding resistance
[ohms]
Unacceptable Range
O.L. - open circuit
L1 L2 L3
0.1
Ohms
DMM
K4 K3 K2 K1
K2
K3
K4
A2
X1 X2
L3 L2 L1
X3
34 44
A1 A3 33 23 11
24 12 ON ERR A4 54
43 53
M
3~
Acceptable Range
<2 ohm
First, remove power to
L1, L2, and L3