User Manual

Page 14 Part # 68C-MKU, Edition 01/2007, Version 1.0
The output interface to the controlled machine is handled by relays rated for heavy duty
resistive and inductive industrial loads (up to 7 A / 250 VAC). Each relay has a ‘Status’ LED
that illuminates when the relay is energized.
Individual relay outputs are routed to the controlled equipment via a terminal strip. When a
fault condition is detected, the Operate (OPR) relay and all outputs are disabled.
Just like the OCU, MCUs use a removable 'TransKey' to define and enable the appropriate
operating parameters.
NOTE: OCU and MCU TransKeys must not be swapped. The OCU (transmitter)
TransKey is black. The MCU (receiver) TransKey is yellow. Swapping
TransKeys will result in OCU/MCU fault indications and the system will
not go into operation.
Referring to Figure 5 below and Table 1 opposite, the MCU has five externally visible LED
indicators on the front cover that display the current system status to the operator.
Figure 5. MCU System Status LEDs