9907-175 Woodward LOAD SHARING MODULE

9907-175 Woodward LOAD SHARING MODULE

Packaging & Delivery

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Product Details

Use this calibration procedure after a Load Sharing Module is installed on a
generator set, to obtain the needed operating characteristics during load sharing.
1. Check that the proper voltage is connected to terminals 15(+) and 16(–).
Proper polarity must be maintained. See the plant wiring diagram, Figure
1-3.
2. Remove wires from load sharing line terminals 10 and 11, and from the
SPM-A Synchronizer (if used) at terminals 24 and 25.
3. Select isochronous operation by shorting terminals 13 and 14.
4. If a speed setting potentiometer is used, set it to mid position (50%). 

Power Supply
DC Models 18–32 Vdc, approximately 5 W.
AC Models Jumper selectable for 95–130 or 190–260 Vac line-to-line,
50–400 Hz, approximately 10 W.
Inputs
3-phase PT Inputs 95–130 or 190–260 Vac line-to-line, 50–400 Hz.
PT input burden is 1.6 W per phase at 240 Vac, 0.4 W per phase at 120 Vac.
3-phase CT Inputs 3–7 Arms at full load, CT input burden at full load is 0.1 VA per phase.
Load Sharing Input 0–3 Vdc into 25 k impedance in isochronous mode, open circuit in droop mode.
Sync Input Compatible with optional Woodward SPM-A synchronizer.
Speed Trim Allows manual adjustment of output level with an external 10 k potentiometer (not available
on part number 9907-173).
Droop Switch The external droop switch is to be wired in series with the auxiliary circuit breaker contact.
Droop mode is selected when either the droop switch or the auxiliary circuit breaker is open.
Outputs
Load Signal DC signal proportional to total real current sensed by the Load Sharing Module.
Used to adjust load gain.
Output to Speed Control +0.5 to +4.5 Vdc analog, ±3 Vdc analog, or PWM, depending on model.
Adjustments
Droop Provides for output reduction between no-load and full-load conditions.
Load Gain Provides adjustment of the load on an individual generator when two or more generators are
paralleled. Adjusts specified full load condition from 3 to 7 Arms.
Environmental
Operating Temperature –40 to +70 °C (–40 to +158 °F).
Salt Fog Tested at 5% NaCl, 35 °C, 47 hrs wet, 47 hrs dry.
Humidity Tested at 95% RH, 65 °C, non-condensing, 5 cycles at 24 hrs/cycle.
Vibration Swept sine: Tested at 4 G, 5 mm, 5–2000 Hz, 3 hr min/axis, including 4 30-minute dwells at
resonant frequencies.
Shock 40 G, 11 ms sawtooth pulse.
 Installation Overvoltage
Category Category III.
Air Quality Pollution Degree 2.
Mounting Any orientation, any convenient location, but not on engine. IP43 protective enclosure
required for compliance with EU Low Voltage Directive.
 Physical Characteristics
Dimensions Length: 273.6 mm (10.77 in.)
Width: 214.1 mm (8.43 in.)
Height: 59.2 mm (2.33 in.)
Weight/Mass 1398 g (49.3 oz.) approximate, dc models
 1488 g (52.5 oz.) approximate, dc models

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