far as i know all yale orderpickers in this series have a slack chain switch located on the chain anchor attached to the platform on the mast side. This is a safety feature incorporated into all thier orderpickers from the EAN series up to the current series.
one on each chain wired in series with each other so if any ONE chain goes slack it stops the truck and displays the slackchain error on the display... for the reason as stam stated, to keep the platform from falling and giving the operator a chance to correct it by only allowing him to raise the mast removing the slack from the chains before doing anything else.
this is a SAFETY SWITCH incorporated into these units by design and to meet OSHA safety standards for industrial truck safety and SHOULD NOT be bypassed AT ALL.
if it is not working correctly you should fix it
now if by some slim chance this unit does not have them and i would be VERY sure if they were ever on there before or not before proceeding, THEN there may be a problem in the programing of the vcm.
By default the 'slack chain' function is enabled according to the manual because as i mentioned yale made this a 'safety standard' on all their order pickers and as far as i know it is not an option anymore. The schematics for truck electrical options do not include these switches as optional , they show them as 'standard' components on the wire guided trucks and the standard trucks both.
So to make a long story short, check the wiring, the switches, the connections and adjust the switch or replace if bad or repair wiring.
And if by the slim chance the switches are not on this truck, (you have previously verified they were never on there from the factory) and you determine the vcm program has to be adjusted to disable this error then call a 'certified' Yale tech in to make the change, DO NOT attempt to do this on your own.
Good Luck
your truck may be equipped with a chain slack switch.
there may be a switch on one end of the chain anchors that is open (or wiring is open) which will cause no lower (wants you to lift to take the slack of the chains up so switch will close. travel disabled to prevent carraige from slamming down if it was hung up on racking or something. as well as no lower to prevent further hang-up)
if your truck does not have chain slack switches your vehicle manager has had the option turned on when you don't require it. (or a jumper has been removed)
i don't have a wiring schematic but i have worked on these trucks before and you can get by without it, just follow the wiring with your meter to the vm plugs.
ok..this is a C801N01818Y. sent controller in for repairs. installed. unit powers up now.. but "slack chn" message appears. replaced encoder upper left side of mast. unit has lift but does not lower. also still no travel. "slack chn" message still appears. does anyone has a wiring schematic i can have. i'm begging to think there are some faulty wires inside the main cable. battery is at 90%.
ok..here is an update...unit powers on..shows ****, battery voltage, Ver 1.7, hours, then Slack Chn message on display. horn works. lift works. no travel and cannot lower. fwd/rev contactors do not close. connected 1311 handset to curtis 1243 traction controller and it works. i can see all the menus and settings etc on the Handset screen...accel POT ok...fwd input OK...rev input OK. i then connected 1311 handset to 1310-5201 master controller and shows "no communication error". this master controller was just repaired by FSIP.
p.s. i have a good used 1310-5301 controller and wanted to know if i can use the copy or clone feature on the handset to try to make it work. i don't know what else to try.
thanks,
jay
Serial number is helpful. Any other codes or signs that the display shows? What is the state of charge of the battery?
I am thinking this jewel has a VCM located behind panel near steer wheel. you can remove panel and look for a light on this module. This should also have another curtis controller for drive. The only time i have ever seen full on astricks was due to handset plugged in or blown controller. I would check both the module for a light and any fault codes/ flashing lights on controller. The flashing light will give you a code. For example 1 flash pause 4 flashes is code 14. Try and get the code flash on controller and post it here. Make sure your battery is fully charged first.