Cellwatch Frontier - Page 35

Cellwatch Frontier System Installation & User Manual
Section I – Installation Guide-35
As shown above, there should never be any other material between the straps or post and the tab.
Ensure that the tab is directly against the lead post of the cell or on top of the load carrying cables.
Where double tabs are needed, never place any material between the two tabs and the post or strap. In
particular, never place a stainless-steel object between the post, strap, and tab such as a washer or nut.
Stainless steel is 50x more resistive compared to copper and will affect the measurements.
Note: When installing multiple tabs on the same post, orient the tabs so that they are not overlapping
to allow for easier DCM connections.
When possible, containers should be tabbed during battery installation. Otherwise, to fit the tab washer
onto the cell the link must be broken, the tab installed, and the link torqued to manufacturer
specification. For safety purposes, always take the battery offline when installing tab washers. DCMs
will connect directly to these tab washers.
See the section titled Battery Configurations for installation practices on various battery configurations.
Two power wires are used to operate a DCM. The brown and white leads supply power to the DCM.
These power leads are often paired with the blue and red sense leads. Therefore, on connections where
the red and blue sense wires connect, there will be additional tab washers for the brown and white
wires. On cells where two DCMs will be connected to the same post there may be a requirement of 4 or
more tabs.
DCM
Channel
DCM Cell
1
st
Sense Wire 2
nd
Sense Wire
# Tabs on Positive
Post
# Tabs on Negative
Post
1 Red Orange 2 (Brown, Red) 1 (Orange)
2 Orange Yellow 1 (Yellow)
3 Yellow Green 1 (Green)
4 Green Blue 2 (Blue, White)
Standard tabbing diagram for a DCM monitoring 4 measuring points (or Channels)
For systems where the number of measuring points is not divisible by four, one or more DCMs will have
‘null’ channels. To null channels, all sense wires for that channel are terminated on the same post or