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Document NAE1088440
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02.2013
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© Bender Inc.
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Page 1/1
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Side 2/2
Bender Inc.
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USA: 800.356.4266 / 610.383.9200 / [email protected]
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Canada: 800.243.2438 / 905.602.9990 / [email protected]
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www.bender.org
LifeGuard® Series (Digital)
Installation Bulletin / Reference Guide
Use - Enclosure Front
Additional Requirements - Backplate Only Models
This section only applies to LifeGuard models purchased without an enclosure and on the
backplate only.
Refer to instructions below for additional requirements for installation and
wiring. Backplate-only models are typically integrated into existing cabinets or machinery.
Mounting - Backplate Only
Refer to Figure 3 below for dimensions. The GFCI must be mounted in a location sufficient to
protect live electrical equipment. Use four (4) #10 screws for mounting. The vertical clearance
of the backplate is 6” for models less than 100 A, and 8” for 100 A models.
Wiring - Control and Remote Indicator Wiring
LifeGuard part numbers ending in “-N-D” apply to this section. Follow the standard wiring in-
structions on the reverse side of this document. Additionally, backplate only models may con-
nect to additional devices for remote capabilities.
Test and reset functions are carried out in one of the following ways:
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Using the test and reset pushbuttons located directly on the ground fault module
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Connecting an MK1500-D remote indicator and using the built-in test and reset buttons
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Connecting an MK1500-D remote indicator and using the TEST, RESET, and T/R terminals to
connect external test and reset pushbuttons
The MK1500-D duplicates indication and test/reset pushbutton functionality. Additionally, ter-
minals are provided for external test and reset. Both are normally open (N/O) contacts.
Observe the following additional requirements:
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Use shielded RS-485 cable, AWG 18 for connections “A” and “B.”
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The red switch labeled “R” on the underside of the ground fault module must be switched
to ON to ensure proper RS-485 termination. Standard RS-485 cable length limitations ap-
ply.
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External test and reset control connections are optional and not necessary for the built-in
test and reset functionality of the MK1500-D and ground fault module.
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The MK1500-D requires an external supply voltage not supplied from the backplate, con-
nected to terminals A1 and A2. The supply voltage range is 100-240 VAC, 50/60 Hz.
Refer to the wiring diagram below for additional wiring required for the MK1500-D. For addi-
tional information on installation and use of the remote indicator, refer to MK1500-D installa-
tion manual.
Do not modify any other wiring on the backplate when installing the remote
indicator.
A
C
B
D
Figure 3 - DImensions of LifeGuard, backplate only
Operation
Apply power to the GFCI
To apply power, close the circuit breaker / disconnect on the line side of the GFCI. If there are no
ground faults present on the system, the green ON LED will illuminate.
Test procedure
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Press and hold the TEST button until display reads “tES.” An internal self-test will initiate.
Unit must trip within 15 seconds. Power to any connected loads will be interrupted.
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Press and hold the RESET button until display reads “rES.” Power will be restored to the load
side of the GFCI.
Field Adjustments
LifeGuard GFCIs with digital display utilize ground fault modules which are not field-adjustable.
Models are either fixed at a 6 mA or 20 mA trip level, depending on option.
Backplate Dimensions in Inches (mm)
Type
A x B
C x D
< 100 A
8.75“ x 10.5“
(222 x 267)
8.25“ x 10.25“
(210 x 260)
100 A
10.75“ x 12.75“
(273 x 324)
Error Codes
For error codes and troubleshooting, refer to LifeGuard user manual, document NAE1085011.
For digital display models, error codes will appear both on the internal ground fault module as
well as the display of the door-mounted remote indicator.
MK1500
GFCI-SERIES
POWER
ON
CIRCUIT
TRIPPED
I mA
I mA
%
25 50 75 100
TEST
RESET
A
B
RESET
T/R
TEST
A2
A1
(Optional External
Test/Reset Connections)
To supply voltage
100-240 VAC
RS-485 cable: twisted, shielded pair
A1 A2
T1
21 22 24
T2
A B
MK1500-D
RCMA421H-DCB-2
RCMA426H-DCB-2
Figure 4 - Wiring MK1500-D remote indicator to LifeGuard GFCI on backplate only (no enclosure)
MK1500
GFCI-SERIES
POWER
ON
CIRCUIT
TRIPPED
55
. .
0
I mA
I mA
%
25 50 75 100
TEST
RESET
Figure 3 - Front of LifeGuard enclosure with digital indicator
1. Digital display: Shows measured
ground fault current in real-time.
2. POWER LED: Illuminates when the GFCI
has received power and has not
tripped.
3. TEST button: Performs a functional test
of the GFCI (instructions for use below).
4. TRIPPED LED: Illuminates when the
GFCI has tripped.
5. LED bar graph: Indicates how close the
GFCI is to tripping.
6. RESET button: Resets the GFCI if faults
have been cleared (instructions for use
below).
1
2
3
4
5
6
