TERRY HARMONY 2 Series, Installation Instructions Manual

Page: 11 / 106

Harmony Series 2 Homelift - XH00200 Issue: D Page 11 of 106
Glossary of Terms
Sling This is the back of the car in which is contained the control
mechanism, wiring and battery for the lift.
Power Pack This is the unit which contains the main circuit board, battery
charger, the hydraulic pump, reservoir, and solenoid system.
Trapdoor This is the infill panel which fills the aperture between upper
and lower floors and forms fire barrier.
Safe Edge This is the surface which will stop the lift when it comes into
contact with an obstruction.
Underpan This is the part of the lift which is left on the underside of the
ceiling and forms the fire barrier and also acts as a safety
surface.
Delay and run circuit
The delay circuit is situated at the back of the board adjacent to CB2. The delay period is
set by potentiometer VR1 and should be between 3 and 3.5 seconds.
The run circuit situated between TB1 and CB1 has its run period set by adjusting
potentiometer VR2. The period is to be set fully anti-clockwise.
Charger circuit
The battery is charged by an internal constant voltage battery charger, integral to the
CE966 board located within the power pack housing.
Up anti-weld circuit
The function of this circuit is to protect the lift if any of the contacts of the two final up
relays RL11 and RL12 become welded together. If this occurs whilst the lift is rising, the
lift will continue to the top. When the lift reaches the top, the green LED (LED3) will
illuminate and any further up movement is prevented.
Down anti-weld circuit
Similar to the up anti-weld circuit but prevents further movement in the down direction
and yellow LED (4) is illuminated.
Final limit switch (situated on Control Mechanism)
When operated this puts a direct short to earth on the emergency circuit blowing CB2,
thus disabling the lift until an engineer attends to resolve the problem.
Safety circuit monitoring device SCMD
The function of the Harmony Lift Controller Safety Device is to blow a fuse (CB2) in the
Controller if there is a short circuit fault between any of the following:-
1) Down hold and earth (0V)
2) Up hold and earth (0V)
3) Emergency and earth (0V)
4) Up hold and down hold
5) Up hold and emergency
6) Down hold and emergency