Dual Power Switch
Dual supply for redundancy and backup in the event of mains supply failure
shall be provided. The dual power supply switch ensures that the InRak always
has an incoming power supply.
For the dual power supplies to operate effectively, the incoming power supplies
must have the same voltage and frequency and be within 120° phase angle.
The dual power switch does not provide protection to the external condenser.
Further provision must be made for this.
Electrical
Standard Electrical features include
• Mains Isolator
• MCB’s
• Withdrawable Main Control Panel
Energy Manager
Three-phase compressors can rotate in either direction depending upon
phasing of the power.
Since there is a 50-50 chance of connecting power in such a way as to cause
rotation in the reverse direction, phase rotation is monitored on a digital input
to the controller to prevent start-up of the compressor upon detection of
reverse phase rotation.
The power meter within the InRak products is capable of monitoring many
different electrical parameters:
• Phase Voltages
• Line Voltages
• Phase Currents
• Unit Power
• Unit Power Factor
Thyristor Controlled Electric Heat
Finned electric heating elements complete with auto and manual reset overheat cut-out protection. Standard electric
heating elements are phase balanced for increased efciency. The thyristor control offers precision control between 0 to
100% via the microprocessor
IEC 60309 Plug and Socket
A IEC 60309 plug and socket shall be tted enabling quick connection of power to the unit.
Ultracap UPS
The Ultracap module is an external backup device for the controller. The
module guarantees temporary power to the controller in the event of power
failures and allows for enough time to keep the controller running with time to
change power supplies. The module is made using Ultracap storage capacitors
(EDLC = Electric Double Layer Capacitor), which are recharged independently
by the module.
These ensure reliability in terms of much longer component life than a module
made with lead batteries: the life of the Ultracap module is at least 10 years.
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