The following figure explains the isolator unit wiring.
| If the power to isolator unit terminals is not correctly connected, +24 V DC to terminal 14 (+vs) and zero to terminal 13 (-vs), the transmitter STR displays the message NO SIGNAL. If terminals 11 and 12 are not correctly connected, sensor cable connecting terminal 2 of the indicating transmitter STR to the isolator unit terminal 11 (-ve) and terminal 1 of the STR to isolator unit terminal 12 (+ve) , the message NO SIGNAL displays. |