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CHAPTER 2: INSTALL ATION/CONFIGURATION
2.1.2.2 Communication connection
Two two-wire RS485 ports (Modbus RTU and Profibus) are available. Up to 32 EntelliPro ES relays can be daisy- chained
together on a communication channel without exceeding the driver capability. Commercially available repeaters can
be used to add more than 32 relays. A suitable cable should have the characteristic impedance of
120 ohms (for example, Belden #9841) and total wire length should not exceed 1200 meters (4000 ft .). Commercially
available repeaters will allow for transmission distances greater than 1200 meters.
Voltage differences between remote ends of the communication link are not uncommon.
For this reason, surge protection devices are internally installed across all RS485 terminals. Internally, an isolated
power supply with an optocoupled data interface is used to prevent noise coupling.
CAUTION:
To ensure that all devices in a daisy-chain are at the same potential, it is imperative that the common
terminals of each RS485 port are tied together and grounded only once at the master or at the EntelliPro ES. Failure to
do so may result in intermittent or failed communications.
Refer to Figure 2-4, Item B for Modbus communication connections. Profibus connections are made on disconnect . For
information on Profibus cable types and lengths, refer to the installation guide for Profibus wiring on the PI
Center home page http://www.Profibus.com/nc/downloads.
2.1.2.3 Thermistor connection
A positive temperature coefficient (PTC) thermistor can be directly connected to the EntelliPro ES TMA terminals. Refer
to Figure 2-4, Item C, for thermistor connection. Connection must be in accordance to IEC 34-11-2.
2.1.2.4 Phase Current Connection
The EntelliPro ES has three channels for phase current inputs. The phase CTs should be chosen so the FLA is not less
than 1/6 of the rated phase CT primary. Ideally, the phase CT primary should be chosen such that the FLA
is 100% of the phase CT primary or slightly less, never more. This will ensure maximum accuracy for the current
measurements. The maximum phase CT primary current is 6400A, with additional interposing CT.
CAUTION:
Polarity of the phase CTs is critical for the ground fault calculation. Refer to Figure 2-4, Item D for typical
phase current input connections.
2.1.2.5 Input/output connection
EntelliPro ES has 16 inputs, 3 form A motor output relays and 5 form A signal output relays.
NOTE:
The number of Inputs and outputs depends on the catalog number.
Inputs can be mapped to any of the input functions, such as contactor 1 On command, contactor 2 On command,
contactor feedback, etc. Inputs can also be configured as active high or low signals. In an input is configured as active
low, the input will be active if the voltage is below the fixed drop-off threshold. If an input is configured as active high,
the input will be active if the voltage is above the fixed pick-up threshold. Refer to section 1.2.3 for input electrical
specification. The complete list of input mapping is shown in Table 2-4.
Refer to Figure 2-4, Items E (outputs) and F (inputs), for typical output and input connections.
2.7
EP OS MOTOR MANAGEMENT SY STEM – INSTRUCTION MANUAL
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