# Moeller DIL EM-10 240V 50HZ Relay Coil Test

#### natcamp10

Joined Feb 16, 2022
3
Hi All
I have 2 contact relays running in a 3 phase cars ( tecalemit 300xb ) hoist and i have question about the coil resistance between A1 and A2 on theses contactors , I m getting Ohms resistance reading of 1530ohms one set of coils and 1639 on the other coil between A1 And A2 which seems really high in my opinion indicating a fault in the coils them selves
Relay specs are as follows
Moeller DIL EM-10 240v 50hz
This is controlled through a moeller ps4-11-DR1 plc controller 230/240 output from PLC not 24volt

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#### crutschow

Joined Mar 14, 2008
33,367
I m getting Ohms resistance reading of 1530ohms one set of coils and 1639 on the other coil between A1 And A2 which seems really high in my opinion indicating a fault in the coils them selves
Why do you think that?

According to the data sheet I found, the pull-in of the coil at 230V is 25VA or 22W.
That gives a current of 25 / 230 = 109mA for an impedance of 230 / 100mA = 2.12kΩ,.
The power factor is 0.88, indicating the impedance is mostly resistive, so your resistive coil reading is in the ballpark.

#### natcamp10

Joined Feb 16, 2022
3
Why do you think that?

According to the data sheet I found, the pull-in of the coil at 230V is 25VA or 22W.
That gives a current of 25 / 230 = 109mA for an impedance of 230 / 100mA = 2.12kΩ,.
The power factor is 0.88, indicating the impedance is mostly resistive, so your resistive coil reading is in the ballpark.
Hi
So long story short
Had sparkie come to my home to wire in a VFD to run a 3 phase hoist, ( he supplied the vfd saying it would run it),
In short on first power up it blow the the protection fuse on the plc
burnt out the raise and lower contacts
He then abandoned the job leaving me with broken hoist
Got hold of another sparkie and he advised there was three phase at my property and we are now is proceeding to run and wire that in ,
I have mostly dealt with dc circuits in my time
Through testing the coils ( please reff photos attached )on the top two K1m and K2m Tested at 550/600ohms across a1 and a2 where as the the coils on the K3m and K4m Were double . 1550 and 1630 ohms
Being AC i wasn't sure how too work this out and found this site so i threw it out there hoping someone might be able to help identify if the coils had been damaged

Joined Jul 18, 2013
28,066
AC coils have much lower DC resistance than it DC counterparts, you cannot calculate the current consumption of an AC coil by using the resistance figure as you can with DC.
AC contactor and solenoid coils are many times more prone to failure than the DC variety.

Joined Jul 18, 2013
28,066
Those contactor specs show a 24vdc DC coil?
How come it is being fed from 240vac PLC output?

#### natcamp10

Joined Feb 16, 2022
3
Those contactor specs show a 24vdc DC coil?
How come it is being fed from 240vac PLC output?
Hi
There are two types
DIL EM10 G is 24v dc
DIL Em10 is 240v 50hz AC
Moeller ps4 111 DR1 is 240v 50 hz on the output side pins 0 and 1 which run the coils in question and also there is a sticker on the back of the coil units stating it is a 240v 50hz unit
it runs 24volt dc input side for the limit switches that tell the plc if the lift arms are all the way up or down