FAQ (Frequently Asked Questions) about the
2301D Digital Load Sharing and Speed Control

Refer to manual 26065.

Q1—What size wire can used on the terminals?

A1—The spring clamp can be actuated by using a standard 2.5 mm or 3/32 inch flat bladed screwdriver. The terminal blocks accept wires from 0.08-4 mm² (27-12 AWG). Two 18 AWG or three 20 AWG wires can be easily installed in each terminal. Wires for the fixed mounted power terminals should be stripped 5-6 mm (1/4 inch) long.

NOTE: Do not tin (solder) the wires that terminate at the terminal blocks. The spring-loaded terminal blocks are designed to flatten stranded wire, and if those strands are tinned together, the connection loses surface area and is degraded.

Q2—How do I connect discrete inputs and what are they commonly used for>

A2—Discrete Inputs (Terminals 28-38) are the switch input commands to the 2301D control. They interact in such a way as to allow engine control and power management under a variety of conditions. Positive voltage is supplied to the discrete input terminal when an input switch or relay contact closes. Terminal 30 is the common input power and is negative in respect to the discrete inputs. This input must be connected to the negative source in order for the inputs to function.

Q3—What type of communication is used on the 2301D, and what type of cable is used?

A3—There are two programs that are used with the 2301D: ServLink and Watch Window. Both programs must be opened to communicate with the 2301D. These programs are also available via the Internet (select 2301D Control View):
www.woodward.com/ic/software/software.cfm

The type of cable is RS-232 null modem.

Q4—What speed range can I use the 2301D on, and can I use it on a turbine application?

A4—

NOTE: The maximum input frequency that can be measured by the speed sensing circuit is 25 000 Hz. Therefore to allow for transient conditions, the Number of Teeth times Rated RPM divided by 60 should be less than 19 000. This control is not recommended for turbine applications.

Reference manual 26065A page 26.

Q5—I have a 4-20 mA remote speed set point but my speed is not changing.

A5—The following discrete inputs must be closed to enable the remote speed set point:

• Terminals "A" 31
• Terminals "C" 33
• Terminals "E" 35
• Terminals "E" 36

Terminals 35 and 36 are the raise and lower discrete contacts. They must be closed to enable this mode. Maintained simultaneous closure of this Lower Speed/Load contact along with the Raise Speed/Load contact enables the Remote Reference Input.

Reference manual 26065A pages 18 and 19.

Q6—After my breaker closes, the unit will not load up.

A6—No input on terminal 37 load generator. If the state of the input is "FALSE" (input switch or relay contact open), the Load Control Function will increase or decrease in order to achieve the Unload Trip level. The CB Aux/Droop Contact discrete input must be "TRUE" for the Load Generator input.

Q7—In the dynamic menu item 15 ( speed filter), how do I set it and what does it do?

A—This is used for low speed engine application and was carried over from another application. Leave this value at default.

Reference manual 26065A pages 18 and 19.

Q8—My units don't load share equally.

A8—When paralleled in isochronous mode or on an isolated bus, generator speeds must be the same. If they are not equal, load sharing will not remain proportional as the load varies. Any difference in loads between the units can be corrected by adjusting the Load Gain.

Procedure for this is in manual 26065A page 56.

Q9—I have two current transformers (CTs). Do I have add a third?

A9—No. Reference manual 26065A page 5.

Q10—My old unit had my shields connected to the ground screw. Should I connect them as shown the manual?

A10—YES! An individual shield termination is provided at the terminal block for each of the signals requiring shielding. All of these inputs should be wired using shielded, twisted-pair wiring. The exposed wire length beyond the shield should be limited to 25 mm (1 inch). Relay outputs, contact inputs, and power supply wiring do not normally require shielding, but can be shielded if desired.

See manual 26065A pages 5 and 12.

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