KMT SL-IV 100D, Operation And Service Manual

Page: 111 / 185

SECTION 8
ELECTRICAL SYSTEM
p. 8-9 05148408
8.1.4 CONTROL POWER CIRCUITS
(see Figure 8-1)
A control power transformer (7) with multiple input taps and 230 VAC
output taps provides all control power to the SL-IV Intensifier Pump. A
pair of leads from the main breaker/ door disconnect (3) are routed to
the transformer (7) input side. Note that transformer (7) input voltage
should match voltage at the wall disconnect (1). Hence, the 2 leads to the
transformer (7) input are correct when L1 is 0 volts and L2 matches the
wall disconnect (1) voltage (e.g., 460, 415, 757, 400, 208 volts-AC, etc.).
Transformer (7) output power is always 230 volts-AC. Note that if the
Pump has a 230 volt AC motor (6) and starter (4) setup, no transformer
(7) is necessary. (IR Waterjet does NOT recommend that Pumps be
operated at 230 volts-AC for reasons of operating cost and energy
savings, though sometimes running the intensifier at this and other low
voltages is necessary.)
Wiring from the control power transformer (7) output (secondary
windings) is directed to two places: 1) motor contactor(s) (5) and 2) 24
volt-DC power supply (8). To minimize the load requirement on the 24
volt-DC power supply, motor contactor coil(s) (5) use 230 volt-AC coil(s),
while the relay logic (11) controlling the motor contactor(s) (4) is powered
by 24 volts-DC.
The 24 volt DC power supply (8) receives 230 volts-AC input power and
regulates it to 24 volts DC, 5 amps maximum output power. 24 volt-DC
power from the power supply (8) first passes through a circuit breaker
and the EMERGENCY STOP (E-Stop) (14) logic, then to the PLC (10), the
touch screen display (12), the optical relays (11), and to other control
functions.
8.1.5 (OPTIONAL) PROPORTIONAL PRESSURE CONTROL
Proportional pressure control (optional) allows the operator to change
cutting water pressure using the touch screen. An electronically-
controlled hydraulic cartridge relief valve mounted on the hydraulic
manifold accomplishes this proportional control. The proportional relief
valve receives its commands from a section of the PLC. An analog output
module attachment with the PLC is required to operate the proportional
pressure control.
8.1.6 (OPTIONAL) MODEM
Modem option available for remote maintenance, trouble-shooting and
software updating.