Unity Motorhome
88
Electrical System Operation
Progressive Industries Electrical
Management System EMS-LCHW30
When shore power is connected it passes
through the EMS-LCHW30 to protect the wiring
in the Wonder.
• Do not exceed the rating on the EMS for
any reason. These devices are designed to
be reduced down to 120V/15A and maintain
full protection.
• Do not modify the EMS in any way as this will
void the warranty, compromise protection
and could result in possible shock, and/or a
re hazard.
• It is important to always check the pedestal
power outlet for charring; this condition
means the AC receptacle is providing a
weak connection. Should this condition
exists, DO NOT USE as it could result in
possible melting of the RV power plug.
• All AC power extension cords in conjunction
with your EMS unit should be rated 10 gauge
for 120V, 30A systems or 6 gauge for 240V,
50A systems and rated’ for outdoor use
to reduce the risk of electrical shock. We
recommend the length not to exceed 20-
25’. Small gauge cable will have a higher
resistance and can result in voltage loss or
an electrical re.
• Whenever servicing or installing the EMS,
or any other AC powered device, make
sure AC power is disconnected.
• Refer to your oor plan in the “Introduction”
section for the surge protector location.
Error Code Chart
EO Normal Operating Condition.
E1 Reverse Polarity (hot and neutral wires
reversed).
E2 Open Ground (no ground wire
connection).
E3 Line 1 High Voltage (line voltage above
132V).
E4 Line 1 Low Voltage (line voltage below
104V).
E5* Line 2 Voltage High (Line voltage above
132).
E6* Line 2 Voltage Low (Line voltage below
104 volts).
E7 Line Frequency High (line frequency
above 69 cycles per second).
E8 Line Frequency Low (line frequency
below 51 cycles per second).
E9 Data Link Down (call technical support)
E10 Replace Surge protector Module (call
technical support).
* Codes only apply to EMS-LCHW50
models.
NOTE: If the EMS cuts the power to the RV
it will show a PE code following the E code.
This denotes the previous error or why the
EMS shut down. Example: The EMS cuts
power for low voltage on Line 1, and then
the power is restored. The Error Code reads
E 0, but the PE code reads PE 4 which tells
the user low voltage was the reason for
the EMS previously cutting power. This PE
error code will be deleted when power is
disconnected from the EMS.
NOTE: There will be a 15 second delay
after plugging the motorhome into shore
power while the surge protector veries the
incoming voltage.
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