Manual 02007
DSLC Digital Synchronizer and Load Control
Woodward
15
For proper operation, it is important that the current transformers be connected
correctly. This means that the corresponding phase current transformer and
potential transformer must be connected to the same phase terminals on the
DSLC control, and that the correct polarity be observed.
WARNING—ELECTRIC SHOCK
Because of the risk of fatal electric shock, never disconnect any wire
attached to generator current transformer terminals 13 through 18 when the
engine is running unless a shorting terminal block and temporary 1 ohm, 5
watt resistors are installed as shown in as shown in Figure 2-1.
Discrete Outputs
The discrete outputs are the relay driver output commands from the DSLC
control. Each optically isolated discrete output is designed as a low side driver
capable of sinking a maximum of 200 mA. The use of drivers allows the user to
supply relays of a contact rating appropriate for the application.
Figure 2-1. Temporary Wiring for Transformer Phase Correction
Discrete outputs require approximately 10 mA at 24 Vdc to power. The discrete
outputs should be powered by the same voltage source as control power.
Connect the 24 Vdc common (–) to terminal 19, and +24 Vdc to terminal 20. The
+24 Vdc is also routed through the appropriate external relay coil to the discrete
output.
Each discrete output contains a diode to suppress the fly-back spikes occurring
when a relay coil is de-energized. For optimum EMI suppression, however, we
recommend the use of relays with self-contained suppression diodes.
Circuit Breaker Relays
Make connections from the breaker close relay coil to terminal 21 and breaker
open relay coil to terminal 22 of the control as shown in Figure 1-3. The breaker
open relay is normally energized. It de-energizes to open the breaker.