Installation, Testing a modbus network, Cdp programmable exercisers – GE Industrial Solutions MX150_MX250 Modbus Network Card User Manual

Page 5: Cdt exercisers

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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 (GE Zenith

Part # 50P-1124). Reference Appendix D for connections.

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.

Connect the

232/485 converter (

Zenith Part

# 50W-1208) to the

that contains the

Configuration software (

Zenith Part # 50P-1111).

A cable needs to be connected to the

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)

Run the Configuration software on the

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

button.

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

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)