TERRY Melody 2 hydraulic MK2, Installation Manual

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27
Melody 2 Hydraulic MK2 Installation Manual - Issue f
System Diagnosis
Battery Connectivity
In the Control Box check the battery voltage with respect to the Earth Terminal
located on the lower left Hand side of the control unit. This should be approximately
13.6 V DC. This voltage is adjustable by means of VR3 on the CE1466 board, but
should be measured and set on the battery leads with the battery disconnected.
The Earth of the Battery is protected via a 10A (RED) fuse.
The Bve is connected directly to TB5 connector BATT input of the CE1466
board and also via a 5A (ORANGE) fuse to the Isolate feed to the call stations and
Trailing Cable Number 2 Red Core to the carriage. TB5 EARTH Input provides the
Earth to the Lift Platform via Trailing Cable 2 Yellow/Green Core.
Voltage Conversion
On the Carriage, Trailing Cable Number 2 Red core pr12V to the 12Volt
to 24Volt DC/DC Converter, the Light Timer, and the Final Limit Switch common
contacts. The Normally open contact of the Final Limit Switch is connected to 0V
so in any instance where the Lift should over travel and fail to automatically dump
down then the 5A (Orange) fuse will blow inhibiting the UPHLS and DNHLD
control signals to the CE1466 board hence disabling the Lifting Platform.
The normally closed contact of the Final Limit Switch provides voltage to the
Carriage Control Stations. The 24V output from the voltage converter feeds the
Gate Enable Switch on the Lift carriage, and the Gate Lock Timer.
Lift Over Travel and Re-levelling
When the lifting platform approaches the upper level, the Zone switch is enabled,
providing power to the Upper Gate Enable circuitry and in addition to the Creep/
Dump Enable circuitry. The creep signal is latched by the latch switch of the
control mechanism and the lift will continue to travel upwards. Upon arrival at the
correct level the latch switch becomes inactive and the lift stops travelling. If the
hydraulic oil in the ram shoud expand, the lift will rise slightly. This movement
enables the Latch switch followed closely by the Dump switch causing the lift to
decend very slowly and automatically return to the correct level, where the Latch
switch will become inactive and the lift cease to travel. If the oil in the ram should
contract, the platform will begin slowly to descend. This movement enables
the Latch switch followed closely by the creep switch. This will cause the lift to
travel in the up direction until it reaches the correct level where the Latch switch
becomes inactive and the lift ceases to travel.
In the event of the relevelling system being disabled, there is a backup “Top Limit
Switch” that will enable the lift to stop close to the upper level, the upper level
gate should still operate, and the lift should still be capable of being used in both
directions. Additionally there is a final limit switch which will activate and blow the
main 5 Amp fuse if the lift should over travel in excess of 20mm.
If there is a requirement for the lift to be manually lowered, the power pack must
be isolated by turning off the lift isolation switch behind the Emergency access
plate. See safe working Information on Page 5 for detail.
When turned off, the Isolation switch integral neon will extinguish
NOTES