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MM-4XP OPERATING INSTRUCTIONS
13
■ Burst Current — The maximum rms current during a
period of around one second. The Burst Current is used
as a rating for magnetic breakers. It is also used for cal-
culating the peak voltage drop in long AC cable runs
according to the following formula:
V pk (drop) = I pk x R (cable total)
■ Ultimate Short-Term Peak Current — A rating for fast-
reacting magnetic connectors.
You can use the following table as a guide for selecting
cable gauges and circuit breaker ratings for the system’s
operating voltage.
The minimum electrical service amperage required by an
MPS-488 is the sum of the Maximum Long-Term Continu-
ous Current for all MM-4XPs connected to the MPS-488. An
additional 30 percent above the minimum amperage is rec-
ommended to prevent peak voltage drops at the service
entry.
NOTE: For best performance, the AC cable
voltage drop should not exceed 10 V, or
10 percent at 115 V and 5 percent at 230 V. Make
sure that even with AC voltage drops that the AC
voltage always remains within the operating window.
SAFETY ISSUES
Pay close attention to these important electrical and safety
issues.
■ The MPS-488 requires a grounded outlet.
■ Do not use a ground-lifting adapter or cut the AC cable
ground pin.
■ Keep all liquids away from the MPS-488 to avoid hazards
from electrical shock.
■ Do not operate the unit if the power cables are frayed or
broken.
Current Draw for MPS-488 with Eight MM-4XPs
Current Draw
(Eight MM-4XPs)
115
V AC
230
V AC
100
V AC
Idle Current 1.16 A rms 1.00 A rms 1.26 A rms
Maximum Long-Term
Continuous Current
2.20 A rms 1.38 A rms 2.60 A rms
Burst Current 3.6 A rms 2.2 A rms 4.3 A rms
Ultimate Short-Term
Peak Current
8.8 A peak 4.6 A peak 9.6 A peak
Earth ground
Chassis ground