GFM600 Quick Start Guide
hank you for purchasing the Raptor Ground Fault Monitor (GFM600-2).
This guide describes how to install the GFM600-2.
The Ground Fault Monitor keeps track of a battery’s plus and minus bus
in relationship to the potential for approaching a grounded condition.
Through its local annunciation and relay interface, the GFM600-2 provides the
necessary signals to keep users informed about the condition of the battery bus
relative to chassis ground.
If you need further assistance, contact RLE Technologies on our website at
http://www.rletech.com/
(go to the
Support Link
) or by calling
970.484.6510,
Option 2
.
1
Pre-Installation
1
Connect the ground fault circuit to a floating battery for proper operation.
IMPORTANT
If the battery is not floating by design, contact the manufacturer for
assistance.
2
Test the battery bus to ensure that a ground fault does not already exist. To
perform this test:
a
Use a voltmeter to determine the voltage potential between the (+)
terminal and the frame. Perform the same procedure between the (–)
terminal and the frame.
b
If no voltage is present, proceed with installation.
c
If voltage is present, a ground fault exists. Correct the problem before
continuing with the installation.
2
Installation
1
Mount the GFM600-2 in the top of the battery cabinet, to the side of the
battery disconnect switch, or in any other convenient location, in close
proximity to the battery bus terminals.
Note:
The GFM600-2 is designed for vertical mount only.
2
Connect the 120VAC power supply to the terminal block marked
120VAC
line
,
Ground
, and
120 Neutral
. Torque to 8 lbs (3.62 kg).
3
Connect the battery plus bus to the terminal marked
Bat+
. Connect the
battery minus bus to the terminal marked
Bat–
. Torque the (+) and (–) bus
wires to 20 lbs (9.07 kg).
4
Connect relay outputs to remote monitoring system (see descriptions that
follow). Torque to 8 lbs (3.62 kg).
Note:
The terminals connecting the battery bus to the fuse box have a “knife-
blade disconnect” that allows the battery bus to be disconnected from the
GFM600-2 to allow servicing of the GFM600-2. Before servicing, 120VAC
power input must also be disconnected from the GFM600-2.
3
Alarm Threshold Adjustment
The GFM600-2’s ground fault current potential alarm threshold can be adjusted
to user-defined limits. The thresholds can be set from 1K ohm resistance to 99K
ohms of resistance. A battery bus in optimal condition with no leakage current to
ground will have high resistance, a battery with leakage current to ground will
have low resistance. Although the factory sets the alarm threshold at 99K ohms,
it is recommended that this alarm threshold be set by the user based on the
specific application.
To adjust the alarm threshold:
1
Locate the two rotary switches on the top of the PC board, which is mounted
on the inside of the front panel.
The position of the left rotary switch indicates the “tens” units of resistance.
The right rotary switch indicates the “ones” units of resistance.
2
Rotate each switch to the desired setting.
Example
:
If the desired alarm limit is 87K ohms, set the left switch to “8,” and the right
switch to “7.” When the alarm threshold is set to 87K ohms and the
resistance falls below 87K ohms (the potential for ground fault leakage
current increases), the GFM600-2 enters an alarm state.
480 VDC Battery Bus: System alarms at 87K ohms
480 VDC/87,000 ohms = 0.0055A = 5.5 mA,
(which is the potential ground fault current)
4
Front Panel Display
.
T
Power LED
Illuminates when 115/230 VAC is connected, and
the power switch is in the “on” position.
Ground Fault LED
Illuminates when the preset ground potential alarm
limit is exceeded.
Status LED
Illuminates when the GFM600-2 system is okay or
not in alarm.
DC Fail LED
Illuminates when the battery wires are discon-
nected. Will flash when the + and – wires are
installed incorrectly (reversed).
Alarm Silence Switch
Disables the audible alert when in the “up” position.
Alarm Silence LED
Illuminates when the audible alarm is disabled.
Reset Button
Resets the GFM600-2. If the reset button is
depressed while a ground fault condition still exists,
the GFM600-2 will still remain in alarm. If a ground
fault condition occurs, and then stops, the
GFM600-2 will remain in alarm until the reset but-
ton is depressed (the GFM600-2 uses a latching
circuit).