Basler Electric BE1-87T - Manual (Page 93)

9171300990 Rev V BE1-87T Installation 4-51
Test Plug
Test plugs (Basler p/n 10095) provide a quick, easy method of testing relays without removing them from
their case. Test plugs are simply substituted for the connection plugs. This provides access to the
external stud connections as well as to the internal circuitry.
Test plugs consist of a black and red phenolic molding with 20 electrically separated contact fingers
connected to 10 coaxial binding posts. The 10 fingers on the black side are connected to the inner
binding posts (black thumbnuts) and tap into the relay internal circuitry. The 10 fingers on the red side of
the test plug are connected to the outer binding posts (red thumbnuts) and also connect to the relay case
terminals.
When testing circuits connected to the bottom set of case terminals, the test plug is inserted with the
numbers 1 through 10 facing up. When using the test plug in the upper part of the relay, the numbers 11
through 20 are face up. It is impossible, due to the construction of the test plug, to insert it with the wrong
orientation.