1. TITLE
26
SP20058_REV0.4
SP19040_REV0 - 16/02/2021
E-SERIES ELECTRICAL TROUBLE SHOOTING
My mower won’t switch on
Nothing happens when I try and start my mower. The screen doesn’t a�empt to boot.
If this is a brand-new machine please see ‘E-Series Initial Connection’ information sheet / paperwork attached to the mower
(SP19028). Battery terminals will have been disconnected for transport.
Follow the check list below point by point un�l the issue is resolved –
1.
Check the E-Stop has been released on the side of the handle bars
2.
Make sure the key has been fully inserted and turns freely into the ‘ON’ posi�on
3.
Make sure the ‘START’ bu�on has been held for >3 seconds to give the electrical system on the machine
�me to engage
4.
Check the handle harness plug connec�on into the electrical box
5.
Check the ba�ery terminals are connected (
mowers should be shipped with these disconnected
). The
terminals are on top on the ba�ery under the ba�ery cover
6.
Make sure there is no visible signs of damage on any of the ba�ery cables.
NEVER TOUCH ANY EXPOSED
WIRES!
7.
Open handle bar console cover to trouble shoot the wiring connec�on.
NEVER TOUCH ANY CONNECTIONS
without the E-Stop pressed and the white harness connector plug disconnected! (refer to manual or INFO
sheet ‘SP19031’)
a)
Check there is a green light on the 12V converter indica�ng power is ge�ng to the handle bar
b)
If there is no light on the converter check the white wiring harness plug is correctly connected
c)
Check connec�ons to START bu�on C (Common) & NO (Normally Open) terminals to be connected
d)
Check connec�ons to E-Stop (wired into NC (Normally Closed) contact block)
e)
Check connec�ons to Key Switch (Posi�on 30 & Posi�on 75)
f)
Check screen connec�ons – plug posi�ons B & C fi�ed the correct way around
8.
Check the ba�ery has not been fully drained. Plug the mower into the charger and power the machine on
to see if the display starts up with the ‘On Charge Screen’
If the problem persists please contact your dealer or Dennis directly
My screen powers on briefly then switches off
‘Loading…’ briefly shows on the screen then disappears.
-
Make sure the START bu�on is held in un�l you hear a ‘click’ from the electrical box. The bu�on needs to be held
for 2-3 seconds to engage the electrical system on the mower
-
Check connec�ons to START bu�on. C (Common) & NO (Normally Open) terminals to be connected
The on screen ‘Parking Brake’ icon won’t disengage
The
‘
P
’
on gear selec�on is stuck on and I can’t put my mower into Drive or Reverse. This means the mechanical parking is
engaged, the icon will automa�cally switch to
‘
N
’
(Neutral) when the brake is fully disengaged.
-
Check the mechanical brake has been disengaged (handle on the lower le�-hand side of the machine)
-
Check the parking brake microswitch is being disengaged from the brake hammer under the le�-hand side guard
My mower won’t operate and displays a ‘PLEASE HOLD DEADMAN HANDLE’ message
OR
My mower doesn’t disengage when I release the bail bar
-
Check the bail bar is being held or fully released when a�emp�ng to operate
-
Listen if you can hear the quiet ‘click’ of the microswitch opera�on under the handle bar console, if not the
microswitch posi�on might need reposi�oned on its bracket to correctly engage / disengage
-
Check microswitch bullet connectors are a�ached under the handle bar console cover (Blue & Black wires on
microswitch)
-
Check con�nuity of the micro switch with a mul�meter
My mower isn’t charging
(also see ‘Charging Info’ in the mower manual or document SP19023)
-
Check charger is plugged in and receiving power. Lights and screen on charger should be illuminated
-
Check charger is correctly plugged into mower
-
Check E-stop is released and correct start sequence has been followed (holding START bu�on un�l ‘click’)
Charger display and lights should be cycling through VOLTS / TIME / CURRENT / AMP HOURS to indicate that the mower is
charging. The display with also show the state of charge on screen.
There are no lights on my charger / Lights are flashing on my charger
No lights illumina�ng on the charge indicate the charger is not receiving power. Check the charger has been plugged in and
check the condi�on of the fuse in the plug
The lights on the charge cycle between red and green when correctly charging the mower. This shows �me on charge,
voltage, current and amp hours being put into the mower ba�ery
‘BMS Comms’ error showing on screen
OR
My mower ba�ery won’t show charge (always showing empty)
-
Check Ba�ery Management System (BMS) cable is connected correctly
-
Unplug the (BMS) cable from the ba�ery and check the condi�on of the internal pins. Bent internal pins in the
cable mean a replacement cable will be required
‘Motor comms’ error showing on screen
-
Check motor cable connec�ons going from electrical box into the motors
-
Check all three power cables to each motor are connected and the le�ers on the wires match those on the motor
(
U
,
V
and
U
)
If your problem isn’t referenced on this document or you are still having problems please contact your dealer or Dennis
Mowers directly.
P
D
R
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