Installation guide, Ea10 series – Veris Industries EA10 SERIES Install User Manual

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ZL0102-0A

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INSTALLATION GUIDE

EA10 SERIES

• The terminal’s voltage and current ratings are compliant with the

requirements of the EIA RS-485 communications standard.

• The RS-485 transceivers are ¼ unit load or less.
• RS-485+ has a 47 kΩ pull up to +5V, and RS-485- has a 47 kΩ pull down

to Shield (RS-485 signal ground).

• Wire the RS-485 bus as a daisy chain from device to device, without

any stubs. Use 120 Ω termination resistors at each end of the bus (not
included).

• Shield is not internally connected to earth ground.
• Connect Shield to earth ground somewhere on the RS-485 bus.

For all terminals on EA10 devices:

• When tightening

terminals, apply the
correct torque: 0.37-
0.44 ft·lb (0.5-0.6 N·m).

• Use 12-24 gauge wire.

To Remove Sensing Modules and Communications Unit From DIN Rail

Disconnect and lock out power to panel or combiner box,

including power to all strings.

1. Unplug the RS-485 and control power connectors from the communications unit.

Disconnect strings and remove them from the current sensing module(s).

2. Loosen or remove the DIN stop clips. Separate the EA10 components by sliding

them apart along the DIN rail. Ensure that the current sensing modules are fully
disconnected from adjacent modules and from the communications unit.

DIN Rail

3. If there is sufficient space on one end of the DIN rail, continue sliding each

component along the rail until they slide off one end.

4. If space is limited, and step 3 is not

possible, then insert a screwdriver into
the groove on the DIN rail clips on one
side of a current sensing module. Use
the screwdriver to pry the clip away
from the DIN rail. Repeat with the
second clip on the same module. The
current sensing module lifts off of the
DIN rail when both clips are loosened.

5. Repeat with any other current sensing modules on the rail.

6. To remove the communications unit, turn

the screwdriver so that it is parallel to the
DIN rail and insert it between the clip and
the DIN rail. Pry the clip away from the DIN
rail. Repeat with the second clip on the
unit. The communications unit lifts off the
DIN rail when both clips are loosened.

9. Configure communications unit using DIP switches (see page 5 to set the DIP

Switches).

10. Wire RS-485 communications to communications unit using the 3-pin connector

provided.

11. Wire 24 to 42 VDC control power to the communications unit using the 4-pin

connector provided.

Caution: Do not apply control power to the 3-pin RS-485 connector.

12. Wire the communications unit to the enclosure’s chassis ground using the 4-pin

connector. Ensure that the enclosure’s chassis ground is tied to earth ground.

Wiring for RS-485 and Control Power Connectors

Modbus
Master
RS-485

–

24 VDC
Power
Supply

–



–

RS-485
(isolated)

DC Power

Sta

tus

Rx/E

rror

20-P

in C

onnec

tor

DIP switches

13. Route each insulated conductor through a DC current sensor.

14. Restore power to the panel and commission the device for operation.

Connecting Multiple Communications Units in a Daisy Chain

The RS-485 slave port allows connection of multiple EA10 communications units in a
daisy chain with up to 63 2-wire devices.

–

120 Ω terminator on the first and

last device of the daisy chain

Shield wire

Red

Black

Gray

0.37–0.44 ft•lb

(0.5–0.6 N•m)

Use 14-24 gauge wire