Hird has developed an operational test for testing the battery performance of DC electric mobile operating work platforms (MEWPs) that has been taken up across the world.
Manufacturers, in particular, were quick to adopt the Hird Test to ensure claims for operational performance could be substantiated and to benchmark their MEWPs against competitor machines.
Peter Hird Snr, the founder of Peter Hird & Sons, as the company was then called, developed the test in the late 1988s, after a customer complained about the poor battery performance of a machine.
The Hird Test involves repeatedly putting a fully-charged machine through a standard set of manoeuvres, known as operational cycles, until it runs out of power.
Since then, Hird has been contacted regularly by manufacturers and operators keen to incorporate the test into their product development, manufacturing, and MEWP maintenance programmes.
- Periodically check the battery condition meter.
- Record the cycle during which the battery light comes on.
- Continue the test but stop at the first sign that the machine is closing down.
- A second person should be present on the ground to monitor the progress of the test and activate the emergency lower if necessary.
Boom Lift and Scissor Lift
Do not fully discharge the batteries during this test, as this may cause damage to the batteries.
Scissor Lift only
If the platform is fitted with an anti-trap system that stops the machine from lowering momentarily, do not activate the emergency lower function from the ground control in any other way. Continue to operate the machine from the upper controls at all times.
Note: the Hird Test is carried out at the discretion of the person performing the test. Hird accepts no responsibility for any tests undertaken. This test is designed as a guide.