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Electronic Theatre Controls Inc

Unison ER4 Max Current Draw

120VAC Calculations

Given an input of 120VAC, the ER4 will draw a maximum of 8 Amperes -- 2 Amperes per option module or processor.

ETC recommends feeding the ER4 with a dedicated 15 or 20A breaker or disconnect.

Given that the Power (Watts) does not change for higher input voltages, we can use the formula W=VA (or P=IE) to determine max amperes at other voltages.

W= VA
W= 120(8)
W= 960
W= VA
960= 230(x)
x= ~4.2

Voltages other than 120VAC
The ER4 will draw a maximum of 4.2 Amperes at 230VAC.  A CME will draw approximately a maximum of about 1.1 Amperes at the same voltage.

Using the same calculations at 277VAC, the ER4 will draw a maximum of ~3.5 Amperes at 277VAC.  A CME will draw appoximately .875 Amperes at the same voltage.

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