mcr OMEGA pro
Power and Control Panel
„MERCOR” S.A. –
The company reserves the right to modify and amend this document without notice.
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3.7.3.
SOFTSTARTERS
Softstarters enable surge-free and smooth starting and stopping of high-power fan motors. The mcr
OMEGA pro Power and Control Panel features HFR-1000 series soft starters which permit voltage ramp
starting, current ramp starting, and surge starting. They also provide an all-round protection of the motors
during starting and stopping. The available soft starter power range is from 15 kW to 315 kW. Soft starters
are operated with an external bypass contactor. The starting current via a soft starter is limited to a
maximu
m of 4× In. If a soft starter has a fault, it is indicated on its front panel display and by the FAULT
LED on the Power and Control Panel front door. See the OEM manuals of the soft starter for detailed
information about the displayed messages.
(*) The conductor shall be sized per the motor power rating; the number of live conductors is provided for electric drivers without service breaker
monitoring.
3.7.4.
INVERTERS (FREQUENCY CONVERTERS)
Frequency converters, or inverters, help control the operation of electric motors whenever speed or
torque must be controlled. The inverters used in the mcr OMEGA pro Power and Control Panels control
the air fan output. Depending on the application, the air fans can be controlled in steps with dry contact
outputs of external systems, as used for ventilating garage rooms, or variable-controlled by 0
–10 V or
4
–20 mA analogue control outputs of various transducers (used e.g. for pressure or temperature
monitoring). An inverter in a fan starting system greatly reduces the starting c
urrent (to ca. 2× In) and the
installation costs. In an installation with high-power fans, wiring based on 4-wire cables instead of 7-wire
cables will greatly reduce the smoke venting system costs. The Fire Mode input enables powering fire
protection fans with the inverter. When in the Fire Mode, the inverter stops responding to all external inputs,
faults or overload signals, which helps effectively vent smoke without bypassing the inverter with a
contactor. Scalar or vector control inverters are available. The mcr OMEGA pro Power and Control Panels
may optionally feature a PTC or TK input for thermal protection of the controlled drive units. The compatible
power rating range for the frequency converters is extremely wide: from 0.25 kW to 630 kW at 3×400 VAC
and from 0.25 kW to 2.2 kW at 1×230 VAC (for 3×230 VAC motors).
(*) The conductor shall be sized per the motor power rating; the number of live conductors is provided for electric drivers without service breaker
monitoring.
Starting
Motor wiring diagram
Live conductors
Motor Winding terminals
Softstarter
4x (*)mm
2
The motor winding
terminals are connected
according to the supply
voltage rating and the
motor name plate.
Starting
Motor wiring diagram
Live conductors
Motor winding terminals
Inverter
4x (*)mm
2
Shielded power cables are
recommended for motors
powered via inverters.
The motor winding
terminals are connected
according to the supply
voltage rating and the
motor name plate.
Fan
Fan
