Manual M-8203
Operation and Maintenance Manual
VGM - Voltage Ground Monitor
VGM-100-24 V
VGM-100-48 V
VGM-100-125 V
VGM-100-250 V
© EAGLE EYE POWER SOLUTIONS
All Rights Reserved.
1
The VGM series is a combination voltage and ground fault monitor that reads battery bus status,
detects out-of-limit conditions, and provides alarm indications at precise user settings. Monitor
status, adjustable UV and OV trip settings, Ground Fault, time delay (0-999 secs) and IP
address settings are easily accessed on the color touchscreen. Each unit continuously displays
monitor status and features Ethernet connectivity to transmit voltage levels and alarms.
The color touchscreen displays status of the voltage and enables input of user settings. The
settings screen may be activated by one touch. Trigger limits may be set, along with desired delay
and the Monitor’s Ethernet IP Address.
The VGM is one series in a family of digital monitors. The Ground Fault Monitors (GFM) read offset
voltage from ground, and alarms for ground faults. The Voltage Monitor (VM) reads DC voltage
level, and alarms for voltage levels outside of the user settings. The Voltage Ground Monitor
combines the functions of the GFM and VM models into a single unit.
The Digital Monitors are designed for quick installation on walls, panels or 48mm DIN rails. Screw
compression terminal blocks ease connection to power and relay contact outputs.
2
Specifications
Part No.
VGM-100-24 V
VGM-100-48 V
VGM-100-125 V
VGM-100-250 V
Nominal V
Voltage Range
24 V
18 - 32 Vdc
48 V
38 - 60 Vdc
125 V
90 - 160 Vdc
250 V
180 - 320 Vdc
Accuracy:
Better than 1%
Battery Voltage Ranges
18-32 Vdc, 38-60 Vdc, 90-160 Vdc, 180-320 Vdc
Fault Resistance Limit Set
Factory Set
1 kOhm to 100 kOhm
10 kOhm
Output Contacts
Form C
Over Voltage, Under Voltage,
Positive Ground Fault, Negative Ground Fault
Contact Rating
Resistive
125 Vac/ Vdc
0.5 A
30 Vdc
2A
expected life - 5 x 105 operations at above ratings
Maximum Switching Power
Time Delay to Alarm
60 W
Adjustable 1 - 999 seconds
Case Dimensions
Case Material
Weight
Temperature Range
5.77 x 3.56 x 1.77 inches
10% glass-filled polycarbonate
10 oz
Operating
0 - 55oC
Humidity
0 to 95% R.H. non-condensing
VGM - 1
3
Operation
The GFM contains a small DC-DC converter power supply to provide regulated 5Vdc power to the
rest of the unit. The input voltage and ground voltages are scaled by resistor dividers to reduce the
voltage to logic levels. These low-level voltages are measured by the microcontroller’s on-board
10-bit ADC. The chip’s firmware programming detects trigger conditions and controls the output
relays through digital outputs. The microcontroller also drives the touchscreen, and sends data to a
Wiznet w5100 Ethernet controller chip for transmission from the Monitor’s LAN port.
When power is applied to the Monitor, the firmware reads the stored settings from the
microcontroller’s on-board EEPROM, and begins monitoring. The touchscreen displays the ground
fault resistance trigger level setting and the Monitor’s IP address. A horizontal bar indicates the
balance in ground fault resistance between the negative and positive battery buses. The status and
bar indicator updates approximately twice per second.
If overvoltage or undervoltage alarm occurs, voltage read out will change from green to red and the
word UNDERVOLTAGE or OVERVOLTAGE will appear onscreen below the voltage display.
If a ground fault occurs, POS GND FAULT or NEG GND FAULT alarm message will be displayed.
Alarm messages are white text with a red background.
4
Setting the Voltage Ground Monitor
All models of the Ground Fault Monitor are shipped with default
settings entered. If different settings are desired, they can be
changed by tapping the Setup button on the touchscreen. The
display will change to the settings screen, where the setting to
be changed can be selected. The procedure is similar for all
settings. All monitor alarms are disabled when in any Settings
screen.
CALIBRATION
Monitors with voltage level alarms can be calibrated (ground
fault alarms in the VGM and GFM are pre-calibrated). To
calibrate the voltage sensing of the monitor will require either a
calibrated voltage source or a calibrated digital voltmeter.
To calibrate the monitor, apply power to the unit for at least ten
minutes. With a known voltage level applied, press the Setup
button on the screen. When the Setup screen appears, select
VGM - 2
Calibrate. The Calibration screen will appear. The voltage readout will be white, and changing more
rapidly than when the Monitor is online.
OVER is the overvoltage alarm level setting. In the Settings screen, tap the black window displaying
the current OVER setting. The screen will change to a numeric keypad. Input of the desired value will
display as it is being typed. The Clear button will erase any typed number and restart the number
entry. The Cancel button will exit the Over Limit screen and return to the Settings screen. The Save
button will save the newly entered value and return to the Settings screen.
UNDER is the undervoltage alarm level setting. In the Settings
screen, tap the black window displaying the current UNDER
setting. The screen will change to a numeric keypad. Input of the
desired value will display as it is being typed. The Clear button will
erase any typed number and restart the number entry. The Cancel
button will exit the Under Limit screen and return to the Settings
screen. The Save button will save the newly entered value and
return to the Settings screen.
GND kOhms is the ground fault resistance setting. The same value is used for both positive and
negative ground faults. In the Settings screen, tap the black window displaying the current Gnd
kOhms setting. The screen will change to a numeric keypad. Type the desired value. The new value
will appear as it is typed. The Clear button will erase any typed number, and restart number entry.
The Cancel button will exit the Gnd kOhms screen and return to the Settings screen The Save button
will save the newly entered value and return to the Settings screen.
DELAY (S) is the time delay setting for all alarms. It is set in seconds. In the Settings screen, tap the
black window displaying the current DELAY setting. The screen will change to a numeric keypad.
Type the desired value. The new value will appear as it is typed. The Clear button will erase any
typed number, and restart the number entry. The Cancel button will exit the Delay screen and return
to the Settings screen. The Save button will save the newly
entered value and return to the Settings screen.
IP ADDRESS is the Ethernet IP address of the Monitor. It is set in
nnn.nnn.nnn.nnn format and can be any legal IP address. In the
Settings screen, tap the IP ADDR button. The screen will change
to a numeric keypad. Type the desired value. The new value will
appear as it is typed. The Clear button will erase any typed
number, and restart the number entry. The Cancel button will exit
the Delay screen and return to the Settings screen The Save
button will save the newly entered value and return to the Settings
screen.
EXIT will return from the Settings screen to the online display.
If the Monitor is in setting screen for 60 seconds without any button being tapped, the monitor will
return to the monitoring screen using the last values saved.
VGM - 3
5
Installation
The VGM-100 is designed to mount on a surface or panel, or on a 35mm DIN rail. A stainless steel
spring clip is provided for panel mounting, and a plastic mounting clip for mounting on DIN rails.
Panel or Wall Mounting
To mount the VGM-100 to a panel, the spring clip must be mounted to the panel, and the VGM-100
snapped onto it. Refer to the dimensional drawing of the clip. Locate and drill two holes in the panel
for mounting the clip. Be sure to allow enough clear space around the clip for the VGM-100. It is
recommended that the holes be tapped for 10-32 UNC hardware
if mounting on a metal panel.
When the clip is securely mounted, install the VGM-100 by
locating the two narrow slots on the back of the case. Slip the
top slot onto the upper tab ot the spring clip, and push the unit
firmly upward until the lower slot lines up with the lower tab of the
clip. While the lower tab and slot are lined up, press the VGM100 onto the clip until it snaps into place against the panel.
Attempt to move the VGM-100 to ensure that it is securely
mounted. The VGM-100 may move slightly on the clip but
should not come away from the panel.
To disengage the clip, it may be necessary to gently pry the
bottom of the unit away from the panel while applying downward
pressure to unsnap the clip.
VGM - 4
DIN Rail Mounting
To mount the VM-100 to a 35mm DIN rail, first attach the
included DIN rail clip to the back of the unit using the three
screws provided.
NOTE: These screws are 6-32 x 5/16” UNC flathead
screws. No other hardware size should be used. Use of
any other size or length of hardware may come into
contact with internal components of the unit and may void
the warranty.
With the DIN clip attached, place the VGM-100 against the DIN
rail and slide it downward until the clip engages the rail. Then
press the VGM-100 downward to compress the springs of
the clip and clear the lower tabs of the clip on the rail. Slowly
release the downward pressure until the lower tabs of the DIN
clip engage the rail.
To remove from the DIN rail, press the unit firmly down to
compress the springs while pulling the bottom of the unit away
from the rail.
VGM- 5
Dimensions & connections
+V Gnd -V
Over
Voltage
Under
Voltage
Positive
Negative
Ground Fault Ground Fault
Screw Connection Terminal
Wire Size - 30 AWG - 14 AWG
Terminal connections
Recommended
22 AWG - 16 AWG
3.56 [90.45]
1.77 [44 .84]
5.77 [146.43]
VGM - 6