■
ABB Zenith
3
■
MX150/MX250 Series Modbus Network Card (71R-2200)
Testing a Modbus Network
The Modbus network can be tested using the compo-
nents in the Modbus Configuration package (ABB Zenith
Part # 50P-1124). Reference Appendix D for connections.
1.
If testing a network consisting of more than one
card, make sure that all of the cards are daisy
chained as shown in Appendix E. Verify that all
Modbus cards are in the run mode (jumper J4 on
the Modbus card must not be installed).
Termination jumper (J6) is only installed on the
last card on the network daisy chain.
2.
Connect the
RS
232/485 converter (
ABB
Zenith Part
# 50W-1208) to the
PC
that contains the
Configuration software (
ABB
Zenith Part # 50P-1111).
A cable needs to be connected to the
RS
485 connector
of the Modbus card and the RS485 connector of the
RS232/485 connector. Check to make sure that the
polarity connections are correct. (See Appendix D)
3.
Run the Configuration software on the
PC
.
4.
Press the
TEST
button and then verify that the settings
in the Communication Settings section match the settings
of the Modbus network. If necessary, make changes
to the settings and click the
NEXT
button.
5.
The software will now scan the network and display
the serial number of all controllers, which have the
Modbus card attached. The user can select any of
the listed serial numbers and execute a load test on
a controller associated with the selected serial num-
ber, but only one controller can be tested at a time.
CDP Programmable Exercisers
CDP Programmable Exercisers are an option on the
MX150 and MX250. They allow the controller to be pro-
grammed to automatically test the generator and
Automatic Transfer Switch. Up to seven exercisers can
be programmed to run on a daily, 7 day, 14 day, or 28
day basis; or up to 24 exercisers can be programmed to
run on a yearly basis.
Configuration information regarding CDP Programmable
Exercisers is available in the Exerciser Configuration
Register (Holding Register 40063):
Bit 0 of the Exerciser Configuration Register (Coil 81)
indicates whether the controller is configured for CDT
or CDP Programmable Exercisers. A one means the con-
troller is configured for CDP Programmable Exercisers.
Bit 2 of the Exerciser Configuration Register (Coil 82)
indicates whether or not the CDP Programmable
Exercisers can be configured to run under load (trans-
fer the ATS to the generator). A zero indicates that
exercisers can only run No-Load. A one indicates that
exercisers can be programmed to run Load or No-Load.
Holding Registers 40101 through 40110 are provided to
control and report the status of the CDP Exercisers.
These registers contain valid data only if the controller is
configured for CDP Exercisers. If the controller is config-
ured for CDP Exercisers, then Holding Register 40063,
Bit 0 (Coil 81) will be set to 1.
Reading the CDP Exerciser Holding
Registers
The controller may be programmed for multiple exer-
cisers, depending on the status of the Exerciser
Schedule Selection. All data relevant to every exerciser
is read out through Holding Registers 40101 through
40110. These registers will contain data describing one
exerciser at a time. The value of Holding Register
40101, “Exerciser Record Pointer”, determines which
exerciser is presently being displayed in Holding
Registers 40102 through 40109.
To read the contents of a different exerciser, the
Exerciser Record Pointer must be written. For example,
in order to read data about CDP Exerciser #3, the
Exerciser Record Pointer must be set to 3.
The controller will automatically place all exercisers in
chronological order.
CDT Exercisers
CDT Exercisers are a standard feature of the MX150
and MX250 (unless replaced by CDP Programmable
Exercisers). They allow the controller to be pro-
grammed to automatically test the generator and
Automatic Transfer Switch. The exerciser will run at the
same time of day on a daily, 7 day, 14 day, or 28 day
basis. Programming of the CDT Exerciser can be done
only at the HMI on the front panel of the MX150 or
MX250.
Configuration information regarding CDT Exercisers is
available in the Exerciser Configuration Register
(Holding Register 40063):
Bit 0 of the Exerciser Configuration Register (Coil 81)
indicates whether the controller is configured for CDT
or CDP Programmable Exercisers. A zero means the
controller is configured for CDT Exercisers. Conversely,
bit 1 implies the controller is configured for the CDP
Exerciser.
Bit 1 of the Exerciser Configuration Register (Coil 82)
indicates whether or not the CDT is configured for
Load Exercises. A one indicates the CDT will run a
Load Exercise. A zero indicates the CDT will run a No-
Load Exercise.
The upper byte of the Exerciser Configuration Register
(bits 15 through 8) indicates the CDT Exerciser Run
Duration, in minutes.
Installation
(cont’d)