SOMFY J4 WT Protect - 2. THE DRIVE AND ITS THREE NEW FUNCTIONS; 2.1. OBSTACLE DETECTION & STRESS RELIEF; 2.2. FROST DETECTION & STRESS RELIEF; 2.3. AUTOMATIC UPPER END LIMIT ADJUSTMENT

J4 WT Protect Drive
Full installation guide
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2. THE DRIVE AND ITS THREE NEW FUNCTIONS
2.1. OBSTACLE DETECTION & STRESS RELIEF
When the EVB meets an obstacle on the way up, the J4 WT Protect
drive immediately stops and reverses to relieve the stress on the EVB
components. The slats tilt in the opposite direction so that the obstacle
can be released. This function, which helps to extend the life of the EVB,
is activated by default.
2.2. FROST DETECTION & STRESS RELIEF
If the EVB is prevented from rising due to frost, the J4 WT Protect
drive stops immediately and reverses slightly to relieve the stress. This
function, which helps to extend the life of the EVB, is activated by default.
2.3. AUTOMATIC UPPER END LIMIT ADJUSTMENT
For reduced maintenance, the J4 WT Protect drive automatically adjusts
its upper position on the first operating cycle, aer 5 cycles, 10 cycles
and then every 50 cycles. This function is not activated by default. It can
be enabled either through an on-site adjustment operation or using the
EMS2 setting tool.
If a building controller is used, aer an obstacle has been
detected, the blind must be placed in the lower end limit
position to resynchronise the drive with the controller.
All of these functions can be deactivated and reactivated
(see section 4.Installation in an EVB).
Obstacle detection only takes place when the EVB is rising.
When the drive is first installed or reset, a complete cycle (round
trip of the application) must be performed to optimise the
function.