M
Hi,
We are presently experiencing problems with the AB uLogix 1000E powered with 24 V dc. We have fried 4 to date. We are using 24 V dc with a
grounded negative. Two were destroyed when a positive ground occured. The Chassis ground was tied to ground at that point and the 24 Vdc battery negative was ungrounded. ( I understand in the uLogix that the Chassis ground, 24 Vdc negative and the RS232 ground are all common). We removed chassis ground at that point on the remaining uLogix.
We then fried another uLogix when, we believe, a high resistance ground occurred on the positive supply. We then grounded our 24 V dc supply at
the negative. Everything was fine until yesterday. A technician attached an RS232 cable to the comm port and the uLogix lights went out.
Has anybody experienced similar problems or have any suggestions ??
Thanks,
Mark Riche, P. Eng.
Electrical Design Engineer
Northwest Territories Power Corporation
4 Capital Drive
Hay River, Northwest Territories
X0E 1G2
ph (867) 874-5266
Fax (867) 874-5264
We are presently experiencing problems with the AB uLogix 1000E powered with 24 V dc. We have fried 4 to date. We are using 24 V dc with a
grounded negative. Two were destroyed when a positive ground occured. The Chassis ground was tied to ground at that point and the 24 Vdc battery negative was ungrounded. ( I understand in the uLogix that the Chassis ground, 24 Vdc negative and the RS232 ground are all common). We removed chassis ground at that point on the remaining uLogix.
We then fried another uLogix when, we believe, a high resistance ground occurred on the positive supply. We then grounded our 24 V dc supply at
the negative. Everything was fine until yesterday. A technician attached an RS232 cable to the comm port and the uLogix lights went out.
Has anybody experienced similar problems or have any suggestions ??
Thanks,
Mark Riche, P. Eng.
Electrical Design Engineer
Northwest Territories Power Corporation
4 Capital Drive
Hay River, Northwest Territories
X0E 1G2
ph (867) 874-5266
Fax (867) 874-5264