User Manual

Page 32 Part # 68C-MKU, Edition 01/2007, Version 1.0
With the correct color coded ‘TransKey’ inserted into the OCU, setting both the STOP and
ON/OFF switches to their respective ‘RUN’ and ‘ON’ positions will apply power to the OCU.
NOTE: Some MKU controllers use the bottom row of keypad switches to
switch the unit ‘ON’ and ‘OFF’.
Immediately after power has been applied to the transmitter, if a good battery is installed, the
multicolor STATUS LED should momentarily illuminate red, followed by orange, then ‘flash’
green. Two short beeps will also be heard. In addition, any time a pushbutton (function key) is
pressed, a beep will be heard and the multicolor STATUS LED will ‘flash’ green during each
radio transmission.
When the battery energy starts to go low, the multicolor STATUS LED will ‘flash’ red and a
beep will be heard once every ten seconds to alert the operator to change or re-charge the
battery pack.
When the ON/OFF switch is set to the ‘OFF’ position, power is removed from the OCU causing
all control functions to cease. Setting (pushing down) the red STOP switch to ‘STOP’ before
setting the ON/OFF switch to ‘OFF’ immediately sends a stop command to the MCU.
Immediately after the stop command has been sent, the radio transmitter within the OCU
switches OFF.
Referring to Figure 14 above, all active Function Key (pushbutton) commands are identified
using labels placed next to each pushbutton. When a pushbutton is depressed, the OCU
transmits the corresponding command (as labeled). All pushbutton operations are momentary
and must be maintained by the operator. Releasing the pushbutton will send an ‘OFF’
command that de-energizes the corresponding output function. A ‘beep’ will be heard each
time a button is pressed or released.
6.3 OCU OPERATION
Dual Pressure (DP) function key pushbuttons are pre-assigned through ‘TransKey’
programming for two-step
operation. In other words, a second output is tied to the second
level of button depression.
Typically, Dual Pressure OCUs send one of two output commands to the MCU from a single
button. DP buttons are paired to opposite directions of the same output, (i.e., forward and
reverse). These two buttons will control direction and speed relays. The first level of
depression on each button will command the desired direction and first step of movement (two
directions = two relays). The third relay is operated by either button’s second level of
depression to the second speed output of the controlled machine. This could be a single relay,
or two separate relays assigned for the second speed step, or for the Variable Frequency
Drive (VFD), accelerate output (for the button in use).