Alpha Technologies CFR Redundant Control Unit - Manual (Page 17)

15
4 Maintenance
4.1 Internal Fuse Replacement
DANGER: Fuse replacement should be done only by qualified personnel.
DANGER: Make sure the power is OFF before opening the front panel.
Two fuses are located on the power board: Input 1: F1 and Input 2: F2 (both are 500 mA).
Figure 4.1
Power Board Fuse Location
R 10
120 V 120 V
R 9
R 8
R 1
R 2
R 3 R 4
R 5
R 6
R 7
208 V
or
240 V
208 V
or
240 V
R 11
R 12
F 2 F 1
1 1 2 2 3 3 4 4 5 5
J 1 J 2
1
2
34
56
7
8
J 3
Input 1 Fuse
(500 mA) Input 2 Fuse
(500 mA)
The RCU has four internal fuses that are accessible from the front panel.
To lower the front panel:
Switch OFF the Input 1 and 2 circuit breakers.
Remove the two Phillips screws on the RCU front panel.
Carefully lower the front panel forward 45 degrees.
1
2
3
Figure 4.2
Logic Board Fuse Location
Logic Board K1 K3
F2
3.15 Amp
F1
3.15 Amp
Two fuses are located on the logic board: Contactor 1: F1 and Contactor 2: F2 (both are
3.15 Amps).