Table of Contents
Advertisement
TROUBLESHOOTING FOUR INPUT ANALOG CIRCUIT CARDS
POSSIBLE CAUSES
9) Open terminal block
connection on the
analog input circuit
card giving the false
reading.
10) Defective Analog
Input circuit card
causing false reading.
Vertiv™
| NetSure™ LMS Data Processing Unit User Manual (Section 5847) | Rev. ZA
TEST PROCEDURE
Remove input power to the LMS1000. The terminal
block on the circuit card is a two piece unit that can
be separated. Remove the detachable half of the
terminal block. Visually inspect both halves of the
terminal block for damaged pins. Reconnect the
terminal block half. Measure the resistance between
the stationary half of the terminal block and the
detachable half. You should measure near zero ohms.
On the Analog Input circuit card, remove the wires
from a pair of input terminals and jumper the pair of
input terminals together. If the reading for that input
does not got to zero or one, the fuse on the Analog
Input circuit card may be open or the circuit card may
not be calibrated properly.
Try a different channel (preferably swap the wiring
from the defective input with the wiring of a known
working channel on that circuit card or another circuit
card) to see if the problem follows the input wiring or
the channel.
Replace the analog input circuit card with a known
working Analog Input circuit card.
LOOK FOR ...
--
--
524
Advertisement
Table of Contents
