Merlin POWERGUARD PRO User's Installation Manual page 11

CONTROL & SENSE CABLING:
The PowerGuard Pro is supplied with 3 separate wiring looms generally as per the diagram below:
Input / Output
Loom 1
Loom 1
Battery 1
Battery 1
PowerGuard PRO
Loom connections are as follows:
Loom 1
(Battery 1)
Wire 1 RD 0.75mm
Wire 2 BK 0.75mm
Wire 3 BU 0.75mm
Wire 4 WH 0.75mm
Loom 2
(Battery 2)
Wire 1 OR 0.75mm
Wire 2 YE 0.75mm
Wire 3 GN 0.75mm
Loom 3
(Input / Output)
Wire 1 RD 0.75mm
Wire 2 WH 0.75mm
Wire 3 BU 0.75mm
Wire 4 BN 0.75mm
Wire 5 BK 0.75mm
Wire 6 OR 0.75mm
Wire 7 GN 0.75mm
Wire 8 YE 0.75mm
Wire 9 PK 0.75mm
• Caution! Care should be taken with the contactor coil connections. Serious damage to the
PowerGuard Pro will occur if wires are shorted or incorrectly connected.
REF: QSF-030
Issue: D
Loom3
Loom 3
Input / Output
Loom 2
Loom 2
Battery 2
Battery 2
PG1
+ -
Battery 1
Contactor
(Note 3)
PG2
+ -
Battery 2
Contactor
(Note 3 & 4)
Note 1
S1
2
RD
OR
8
Note 2
LED 1
Merlin Equipment Ltd
PowerGuard Pro – User and Installation Guide
5A
Battery 1 Positive
Ground (KL31)
5A
Battery 2 Positive
Ignition Feed (KL15)
3
WH
PowerGuard
Reset Switch
BK
7
Note 1
S2
2 3
RD
BU
Battery 1
Isolator
GN BK
8 7
Note 2
LED 2
Note 1
2
RD
YE
8
Note 2
LED 3
Notes
1: Drawing details Carling
type momentary switch
with integral LED.
Separate Switch and LED
can be utilised if
required.
2: LED Supply 5 Volt DC
source with a 1K series
limiting resistor.
3: PowerGuard contactor
terminal connections are
handed (Pos / Neg).
4: PG2 only used on 2
battery systems.
5: Wire / cable wiring
must comply with
IPC/WHMA-A-620A.
S3
3
BN
Battery 2
Isolator
BK
7
Page: 11 of 18