KUSSMAUL WP-20 User Manual - page 6
170 Cherry Ave.,
West Sayville,
New York 11796
Phone: 800-346-0857
Fax: 631-567-5826
E-Mail: sales@kussmaul.com
www.kussmaul.com
4-3) EVM-12-1 Installation
Locate a visable place to mount the meter panel, front panel of meter is waterproof, so it is ok to install in an area exposed
to the weather. Refer to last page of manual for proper cut-out and mounting screw dimensions.
See
Figure 2 above for wiring diagram. Route the Blue wire from the WP-20 to the meter panel cut-out. This wire can
be extended if necessary. Connect the Blue wire to terminal #4 on the five position EVM terminal block/connector. Note,
screw terminal #5 and #2 are unused.
Next, using a two conductor cable (recommended wire size: 18-22 AWG) connect one end to the EVM terminal block/
connector terminals as shown on the next page and the other end to a 12 VDC source - see wiring diagram above.
Install a 1 amp fuse on the +12 VDC wire first before connecting to 12 VDC, as close to the source as possible.
Note: If the meter panel is in an exposed area, use gasket included or apply a bead of silicone to the flange underside of
the panel, (see Fig. 1 or 2) to prevent water intrusion behind the pane. Reconnect AC power to the charger, this completes
the installation.
4-4) Operation
A) Battery and Charger Status Indicators
The EVM-12 panel enables you to monitor when the charger is on and the batteries’ state of readiness at a glance. Red,
orange, and green bar LEDs indicate the batteries’ state of charger, and a blue ‘Charger On’ LED is illuminated whenever
AC power is connected to the charger. Flashing red bars indicate when High or Low voltage is detected. The display has
a sleep mode to conserve power, and gives periodic flashing indication of the battery voltage level even when the vehicle
engine and charger are off. In the event battery voltage drops to a critical level, the display will automatically come out of
sleep mode into full operation to alert the operator.
Battery status bar graphs operate as follows: With a fully charged battery, all five green bars will be lit indicating a battery
voltage of over 13 volts. As the battery discharges, the green bars will go out one at a time until three remain lit, which is
about 12.4 volts. As the state of charge drops further, the bars will change to orange, indicating the battery is getting low,
which is below 12.4 volts. As the voltage of the battery drops lower, orange bars will illuminate. Once the battery is nearly
discharged, the orange bars will go out and one red bar will remain illuminated. As the voltage continues to drop further,
one red bar will begin to flash, indicating the battery is discharged to 11.2 volts and should be re-charged as soon as pos-
sible.
In the event that the battery voltage goes too high, over 15 volts, the entire 5 red segments will flash red to indicate an
over voltage condition. If this should occur while the vehicle’s engine is in operation, it’s possible there is a fault within the
alternator/charging system. This can be checked by shutting off the vehicle’s engine and observing if the battery status
upper red bars quit flashing. If an over voltage indication is observed when the vehicle’s engine is not running disconnect
power from the battery charger and observe the panel to verify that the blue ‘Charger On’ LED is out and the upper red
LED bars have quit flashing and are now green. If so, the battery charger’s output voltage should be tested to insure it is
correct for the battery type selected.
B) Time-Out Feature/Sleep Mode
To conserve battery power, the EVM-12 has a time-out feature called ‘sleep mode’ which activates after a period of 48
hours if the charger and/or the vehicle is off and either battery voltage is below 13 volts. The meter will automatically
come out of sleep mode whenever either battery(s) voltage is above 13 volts. When the meter is in the sleep mode, the
LED segments will blink once every 2-3 seconds. The LED’s which blinks also indicates the voltage level of that battery.
Therefore, it is possible to monitor the battery voltage even in sleep mode. Sleep mode reduces battery current drain. In
the event that battery #1 or battery #2 voltage drops below 11.9 volts, the display will come out of sleep mode and the
LED segment will illuminate to indicate the battery’s state of charge. If low battery condition is noticed, the battery should
be re-charged as soon as possible.
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