GE Industrial Solutions MX150_MX250 Modbus Network Card - Manual (Page 4)

Installation
Installation on the Controller
If the Modbus network card is not installed on the
controller, do the following to install it:
1. Open the ATS cabinet. If the ATS has power going
to it, be EXTREMELY cautious not to touch any
energized parts.
2. Remove the two Engine Start wires from the P-Relay(s)
if applicable (not applicable in Utility-Utility applica-
tions). Use electrical tape to tape over the exposed
ends of both wires.
3. Obtain a grounding wrist strap and put the elastic
end of the strap on your wrist. Attach the alligator
clip end to the controller chassis or an equivalent
earth ground.
4. Remove the J5 plug from the controller (located on
bottom of board), this will remove power. If controller
is equipped for external battery, also remove the J4
connector from the side of the controller. When
power is removed from the controller, the ATS will
not transfer.
5. Unscrew the black metal cover from the back of the
controller. Be sure not to lose any screws.
6. Remove the three screws from the metal standoffs
on the controller. Plug the Modbus network card
into socket J3 and fasten it to the controller with
the three screws (previously removed).
7. Screw the black metal cover back on.
8. Reconnect the J5 plug back into the controller.
(If controller is equipped for external battery, also recon-
nect the J4 connector on the side of the controller.)
9. Connect the two Engine Start wires to the P-Relay(s)
if applicable.
10. Once the controller has power, the network option
must be enabled by going into the CFG menu for
the network option (Reference Appendix H).
11. When the network option is enabled, exit the
CFG menu.
Termination Resistor
Located on the bottom of the Modbus card is jumper J6
(See Appendix C), which enables or disables a termination
resistor on the board (Figure 3). Jumper J6 is disabled when
it comes from the factory.
The only time that Jumper J6 should be enabled is when
its corresponding Modbus card is the last device at the end
of the chain.
Enabled
Disabled
(Factory Default)
Figure 3 – Jumper J6
■ ■ 2 GE Zenith Controls ■ ■ MX150/MX250 Series Modbus Network Card (71R-2200)
Configuring a
Modbus Network Card
The Modbus card can be configured in a variety of ways.
The configuration of the card includes configuring the
slave address, RTU or ASCII mode, baud rate, parity, and
stop bits (the default settings are Slave Address 1, RTU mode,
9600 Baud, No Parity and 2 Stop Bits) . These slave settings will
be setup by the user and must match the master device
settings for proper communications. The user configures
these settings using the Modbus Configuration applica-
tion (GE Zenith Part # 50P-1111). This application can
also read the configuration of the card. The following is a
procedure for configuring the Modbus Network card
(See Appendix D for wiring connections).
To change configuration settings:
1. Disconnect the two Engine Start wires from the P-
Relay(s), if applicable. Use electrical tape to tape over
the exposed ends of both wires.
2. Obtain a grounding wrist strap and put the elastic end
of the strap on your wrist. Attach the alligator clip end
to the controller chassis, or an equivalent earth ground.
3. Remove the J5 plug from the controller (located on
bottom of board). This will remove power. (If controller
is equipped for external battery, also remove the J4 con-
nector from the side of the controller.)
4. Unscrew the black metal cover from the back of the
controller.
5. Install the J4 jumper on the back of the Modbus Card
(Refer to Appendix C for location).
6. Connect the RS232/485 converter (GE Zenith Part #
50W-1208) to the PC that has the Configuration
Application Software Installed.
7. Connect a twisted pair cable between the RS485 connec-
tor of the Modbus Card and the RS485 connector of the
RS232/485 converter. Verify correct polarity (Refer to
Appendix D for connection).
8. Reconnect the J5 plug. This will restore power to the
controller.
9. Start up the Configuration Application on the PC.
10. Click on the “READ” button to read the device's current
configuration.
11. Click on the “MODIFY” button to enable parameter
changing.
12. Make necessary changes to the communication settings.
13. Click on the “WRITE” button to send the new configu-
ration to the Modbus Card.
14. Verify that the configuration was written by clicking the
“READ” button, and verify the settings.
15. Remove the J5 plug from the controller.
16. Remove the J4 jumper from the Modbus Card.
17. Screw the black metal cover back on the controller.
18. Reconnect the J5 plug to the controller. (If controller is
equipped for external battery, also reconnect the J4 con-
nector on the side of the controller.)
19. Reconnect the two Engine Start wires to the P-Relay(s),
if applicable.