Installation Manual PA Pro III
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2018-03-16 Page 23 of 30
9
Configuration of Power Meter EM24
This section explains how to change the most common settings on the EM24. In most cases the
power meters will be delivered pre-configured to fit the system, but changes in the setup compared
to the order may cause a need for change of these settings.
9.1
Change CT-ratio configuration
The EM24 is normally pre-configured for the current transformers to be used, but change of plans
may require the adjustment of the current ratio. The ratio is most often described as a ratio, for
example 300:5 A. To get the correct value divide the first number by the second, for example
300/5 = 60.
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Put the knob in position 1 to enable programming.
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Push in the joystick for three seconds.
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Enter the password by pushing up/down. Default setting is 0.
•
Push in to enter the password.
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Push right five times to the menu section “Ct rAtio”.
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Push in to change the setting (PrG is displayed).
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Push right/left to toggle between different size ranges for the CT-ratio and up/down to set
the exact value. A small “k” to the left of the value denotes a multiplier of 1000.
•
Push in to save the setting (PrG disappears).
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Push left six times to the menu se
ction “End”.
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Push in to end the programming.
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Put the knob back into position “locked”.
9.2
Change Modbus address
In a system with more than one power meter EM24 the units have different addresses for the
central unit to distinguish among them. This address is normally correctly set when delivered but
can sometimes need to be changed.
•
Put the knob in position 1 to enable programming.
•
Push in the joystick for three seconds.
•
Enter the password by pushing up/down. Default setting is 0.
•
Push in to enter the password.
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Push left three times to the menu section “AddrESS”.
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Push in to change the setting (PrG is displayed).
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Push up to change address to the desired number.
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Push in to save the setting. The display will show “bAudrAtE”.
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Push up and then right twice to the men
u section “End”.
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Push in to end the programming.
•
Put the knob back into position “locked”.
