— A-5 —
Appendix 2: How to Check Motor Condition
Examine resistance and insulation resistance of Motor windings to check if the Motor is in working
condition. The Motor is in normal condition if the checking procedures below are all satisfactory.
First, check the winding resistance including the Motor cable. If the result is not satisfactory, check the
Motor only.
Resistance check of Motor winding
Fig A-5: Check with the Cable set
Tester
(1)
(2)
(3)
(4)
(5)
(6)
(7)
(8)
Ω／
(9)
Fig A-6: Check the Motor only
Tester
Ω／
(1)
(2)
(3)
(4)
Do not turn the rotor while checking the Motor winding.
Table A-5: Checking points
Cable connector Motor connector Result
øU øV
(1) ↔ (2)
(U) (V)
(1) ↔ (2)
(U) (V)
øV øW
(2) ↔ (3)
(V) (W)
(2) ↔ (3)
(V) (W)
øW øU
(3) ↔ (1)
(W) (U)
(3) ↔ (1)
(W) (U)
Table A-6: Specifications of resistance of Motor winding
Motor type
Winding resistance (Ω)
Specification
PS1006
24.4
PS1012
10.6
PS1018
5.1
PS3015
5.8
PS3030
4.6
PS3060
2.4
PS3090
3.5
1. ± 30% of error
2. Difference between each phase UV, VW, and WU
is less than 15%
Please ask NSK sales or representative for a Motor with special winding specifications and a
Cable longer than 4 m.
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