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HYDROFIT™ Owner’s Information Manual
WARNING: The use and ownership of this work is defined in the legend upon the front page hereof.
The third method used to obtain performance information is through the visual means
of Light Emitting Diodes, or LEDs. LEDs will turn on or off depending upon the function
taking place. The mechanic will use the visual feedback to verify whether or not the
function is working properly. For example, if the car is in the normal mode of operation,
the LED designating that function will remain lighted. If the mechanic sees that
the LED is off, he or she immediately knows that something is wrong. There are a
total of 12 LEDs located on the input/ouput board in the controller. They are as follows:
LED1 – CAN0 LED9 - POWER
LED2 – DNFAST LED10 – RSL
LED3 – DNSLOW LED11 – RING
LED4 – UPFAST LED12 – CAN1
LED5 – UPSLOW LED13 – DOOR CLOSED
LED6 – DZ LED14 – GATE CLOSED
Emergency Return Unit
The Emergency Return Unit is a battery-operated device that returns the elevator
car to a designated floor in the event of a building power loss. The ERU opens the
elevator doors to discharge passengers, closes the doors, and shuts down the
elevator. It is wired between the main line disconnect switch and the controller. The
switching logic of the ERU is arranged so that power continuity to the elevator is
maintained. Additional circuits provide battery charging and a normal/test switch
to test the unit.
Indicator Lamp Indicator Color Condition
Emergency Power On Yellow Off when Normal
Charger On Green On when Normal
A meter that measures the battery’s charge is located above the indicators. This meter
should be checked periodically to make sure the battery has sufficient charge to operate.
The meter should indicate between 26 and 27.5 volts.
Located just below the indicator lamps is the switch used to test the system. The system
should be tested at least once per year. To test the system, move the switch to the “test”
mode. An alarm will sound to indicate that the unit is engaged and the indicator lamp for
Emergency Power On will light. If an alarm does not sound, then the unit is not working
properly and will have to be examined.
When a building experiences a power failure, the power supply engages and
automatically returns the elevator to the lowest landing, opening the doors to allow
passengers to exit safely. The elevator car remains parked with doors closed until normal
power is restored.
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