Electrical Management System (EMS)
EMS-PT30X & EMS-PT50X
Instruction Manual
EMS-PT50X
EMS-PT30X
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INSTRUCTION MANUAL: ELECTRICAL MANAGEMENT SYSTEM (EMS)
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INSTRUCTION MANUAL: ELECTRICAL MANAGEMENT SYSTEM (EMS)
Features
• Low Voltage Protection: Whenever the AC line voltage drops below 104V for longer
than 6 seconds, the EMS will automatically shut down power to the RV.
If using an EMS-PT30X, the display will show a low voltage error code of E 4.
If using an EMS-PT50X, an E 4 error code indicates a low voltage error on line 1
while a low voltage error on line 2 will display an error code of E 6.
If the EMS unit has shut o power to the RV due to a low voltage condition, it will
continue to monitor the line voltage. If the line voltage rises above 104V, and no
other error conditions are detected, the unit will initiate re-applying power to the
RV by starting the 2 minute 16 seconds (136 seconds) timer. While the timer is
active, the time delay indicator on the display will begin ashing. After the time delay
duration of 2 minute 16 seconds (136 seconds) has expired, the EMS will once again
provide power to the RV.
• High Voltage Protection: There are stepped voltage ranges used for overvoltage
protection to account for line variations as described below.
» If the AC line voltage rises above 132V but remains less than 140V for longer than
3 seconds, the EMS unit will automatically shut down power to the RV.
» If the AC line voltage increases to a range greater than 140V but less than 156V,
the EMS will automatically shut down power to the RV after 1 second.
» If the AC line voltage is greater than 156V, the EMS controller will shut down
power to the RV within 60 ms (0.06 seconds).
If using an EMS-PT30X, the display will show a high voltage error code of E 3.
If using an EMS-PT50X, an E 3 error code indicates a high voltage error on line 1
while a high voltage error on line 2 will display an error code of E 5.
If the EMS unit has shut o power to the RV due to an overvoltage condition,
it will still continue to monitor the line voltage. If the line voltage drops back below
132V, and no other error conditions are detected, the unit will initiate re-applying
power to the RV by starting the 2 minute 16 seconds (136 seconds) timer. While the
timer is active, the time delay indicator on the display will begin ashing. After the
time delay duration of 2 minute 16 seconds (136 seconds) has expired, the EMS will
once again provide power to the RV.
• Time Delay for A/C Compressor: When rst plugging in, if AC power is interrupted,
or the EMS detects a fault, the 2 minute 16 seconds (136 seconds) time delay is
activated. This is to protect the air conditioning compressor.
• 3-Mode Surge Protection (EMS-PT30X): This feature provides three modes of surge
protection; line to neutral (L-N), line to ground (L-G) and neutral to ground (N-G).
The total joule rating is 1,790 J and 44,000 A surge current. Response time is < 1 ns
(1-9 second).
• 5-Mode Surge Protection (EMS-PT50X): This feature provides ve modes of surge
protection; line 1 to neutral (L1-N), line 2 to neutral (L2-N), neutral to ground (N-G),
line 1 to line 2 (L1-L2), and line to ground (L-G). The total joule rating is 3,580 J and
88,000A surge current. Response time is < 1 ns (1-9 second).
• Surge Indicator: In the event of a power surge causing the surge protection devices
across line to neutral (L-N), line to ground (L-G) to become damaged or depleted
within the EMS unit, the display will show an E 10 error code. This indicates that the
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INSTRUCTION MANUAL: ELECTRICAL MANAGEMENT SYSTEM (EMS)
surge protection module is depleted and is no longer providing surge protection to
your RV. It is recommended that you replace the surge protector. This error will not
shut o incoming power to the RV.
• Reverse Polarity Protection: Reverse polarity is a condition where the hot line and
the neutral line are reversed. A reverse polarity condition could harm you and/or
your RV electrical system and electrical equipment. If the EMS unit detects a reverse
polarity condition, the EMS will not provide power to the RV and a reverse polarity
error code of E 1 will be displayed.
• Open Neutral Protection: Open neutral is a condition where the neutral wire is
disconnected and could pose a shock hazard. An open neutral condition could harm
you and/or your RV electrical system and electrical equipment. If an open neutral
condition is present, the EMS will not turn on. Since the EMS is o, the display will
not illuminate and power to the RV will not be activated.
• Open Ground Protection: Open ground is a condition where the earth ground
wire is open or the neutral and ground wires are not bonded together creating an
electrical safety hazard. An open ground condition could harm you and/or your RV
electrical system and electrical equipment. If the EMS unit detects an open ground
condition, power to the RV will not be provided. The open ground error code shown
on the display will be E 2.
• AC Frequency Protection: The normal operating frequency of the AC voltage
should be 60 Hertz. AC frequency below 51 Hertz or above 69 Hertz could harm
your RV electrical system and electrical equipment. If the frequency is outside the
stated ranges, the EMS will shut down power to the RV. An error code of E 7 will be
displayed if the frequency is high. If the frequency is low, the display will show an
error code of E 8.
• Accidental 240V Protection: If 240 volts is detected when plugging into AC
power the EMS will NOT allow power to the RV. Should this condition occurs while
power is applied to the RV, the EMS will shut down power instantly. The EMS will
indicate an E 3 error code and display the voltage. (SHOULD THIS OCCUR NEVER
BYPASS THE EMS).
• Display: Display continuously updates, at 2 second intervals, all AC power
information: voltage(s), current(s), frequency, error code, previous error code
(if applicable).
• Previous Error Code: Previous error code (PE) indicates what error occurred and
why power was interrupted. To delete code, disconnect power from EMS.
• Weather Resistant: Unit can be exposed to outside weather elements; however,
the unit may not be submerged. Unit is designed to be mounted or used vertically.
• Built-in Locking Bracket: Helps prevent theft by securing the EMS to the power
source pedestal using a lock, such as a bicycle cable lock.
NOTE: Provided you have the proper adapter, the EMS may be used with 15A, 20A, 30A
or 50A service and will provide full protection. The power should be limited to the lower
amperage rating of the power source and RV. The circuit protection at the power source and
the RV are the current limiting devices.
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