Basler Electric DECS-100 - Manual (Page 49)

9287500991 Rev M DECS-100 Installation 4-15
PRELIMINARY SETUP
Before starting the generator and DECS-100 for the first time, proceed as follows.
1. Tag and disconnect all wiring to the DECS-100. Be sure to insulate the wire terminals to prevent a
short circuit.
2. Start the prime mover and perform all engine governor adjustments.
3. After all initial governor adjustments have been made, shut down the prime mover.
4. Connect only the DECS-100 power input terminals to an auxiliary power source. Before applying
DECS-100 operating power, observe the precautions noted in Operating Power Considerations
During DECS-100 Programming.
5. Perform all initial DECS-100 settings by connecting a PC operating with BESTCOMS to the rear
communication port of the DECS-100 and save all new settings.
6. Remove power from the DECS-100.
7. Connect the rest of the DECS-100 leads using the tagged identification.
8. Start the prime mover/generator and perform the final adjustments at rated speed and load.
9. After the initial startup, the DECS-100 should not require any further adjustments unless there is a
change in the system.
Operating Power Considerations During DECS-100 Programming
Due to its pulse-width modulated (PWM) power stage, the DECS-100 operating power input has a
substantial amount of capacitance. High inrush current can be experienced upon DECS-100 power-up
when a stiff power source is used. When powering the DECS-100 for programming with voltage greater
than 120 Vac, high inrush current may damage the unit. Therefore, during programming, DECS-100
operating power should be within the range of 30 to 120 Vac (50/60 Hz).
NOTE
Where convenient, 24 Vdc operating power may be applied only for the
purpose of programming the DECS-100.
If it is necessary to perform programming with applied operating power over 120 Vac, a current-limiting
resistor must be connected between the power source and DECS-100 (Figure 4-12). A resistor rated at
20 ohms and 20 watts may be used to limit the inrush current to a safe level. During the duration of the
inrush current (about one cycle), the resistor power rating will be exceeded. Once the inrush has passed,
the resistor power dissipation level will be minimal. If desired, a 10 ohm, 50 watt resistor may be used
instead.
WARNING!
Lethal voltage is present at the rear panel when the unit is energized. Rear panel
connections should be made only when the unit is de-energized.
CAUTION
When programming the DECS-100 without the generator spinning, the
connections to DECS-100 terminals F+ and F– should be removed.