User guide

(T7446L, H) Relay Output Modules
PD - 7017 Mar - 06 7
Relay Operation
The relays used on the T7446L contain SPDT contacts. For
the Form - A or Form - B selectable outputs, a jumper in the
module is used to select Form - A (N.O.) or Form - B (N.C.)
action.
The relays used on the T7446H contain t wo SPST contacts
(one normally closed and one normally open). Jumpers within
the module are also used to select the relay form. On the
Form - C output, there is no guarantee for make - before - break
or break - before - make.
Output Form Selection
Two sets of jumper posts are used to select the output form for
the selectable relays. The jumper locations are shown in
Figure 4 . The jumper post designations are shown in Table 1 .
Only one jumper shunt can be installed for each relay. The
modules are shipped with the jumpers positioned for normally
open contact outputs.
Table 1 . Jumper Designations.
Jumper
Form
Description
E110
NO1
Selects normally open for relay 1
E111
NC1
Selects normally closed for relay 1
E120
NO2
Selects normally open for relay 2
E121
NC2
Selects normally closed for relay 2
E170
NO7
Selects normally open for relay 7
E171
NC7
Selects normally closed for relay 7
E180
NO8
Selects normally open for relay 8
E181
NC8
Selects normally closed for relay 8