ARRI WRC-1 - Manual (Page 166)

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No iris motor is connected to the UMC-1,
a CLM-1 is connected as the iris motor,
or the IRIS sliding switch is set to OFF and a function has
been selected which requires the iris to be controlled
or the calibration process is running.
Connect a CLM-2 iris motor,
or set the IRIS sliding switch to ON and then switch the
WRC-1 (and WMU-1) off and on again to reset the units,
or select a WRC function which does not require an iris
control.
Command to calibrate the lens.
Press the CAL button on the WMU-1.
An iris table is not activated.
Connect the iris control as described in chapter 4.1.2,
calibrate the lens and assign the T-stops as described in
chapter 5.5.1!
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rnings