Alpha CFR Redundant Control Unit User Manual
n Operator’s Manual
n Redundant Control Unit
FOR CFR UNINTERRUPTIBLE POWER SUPPLIES
FROM ALPHA TECHNOLOGIES
TABLE OF CONTENTS
1. Introduction.......................................................................................................1
1.1 The Alpha Redundant Control Unit (RCU)................................................................... 1
1.2 A Tour of the RCU ........................................................................................................ 2
1.2.1 Front P anel......................................................................................................... 2
1.2.2 RCU Interior....................................................................................................... 4
1.2.3 Rear Panel......................................................................................................... 6
2. Installation.........................................................................................................7
2.1 Unpacking and Inspection Checklist............................................................................ 7
2.2 Rack Mount Installation................................................................................................ 8
2.3 Wall Mount Installation.................................................................................................9
3. Operation....................................................................................................10
3.1 RCU Start–Up and Test Procedure............................................................................ 10
3.2 RCU Voltage Configuration ....................................................................................... 13
4. Maintenance ...............................................................................................15
4.1 Internal Fuse Replacement ....................................................................................... 15
4.2 Troubleshooting.........................................................................................................16
4.3 RCU Wiring Diagrams ............................................................................................... 17
4.4 Return Instructions..................................................................................................... 18
4.5 Specifications ............................................................................................................ 19
4.6 Warranty ....................................................................................................................20
1 Introduction
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1.1 The Alpha Redundant Control Unit (RCU)
Purpose: Describes the operation of Alpha’s Redundant Control Unit (Figure
1.1)
Alpha’s Redundant Control Unit (RCU) provides a dual–redundant configuration, ensur ing
power is always supplied to the critical load. Both input voltages are monitored, so if power is
lost at input 1, the RCU transfers to input 2. Input 1 is the primary source of power so the RCU
automatically returns to it when power is restored. Before transferring, it waits about 1 minute
to allow input voltage and frequency to stabilize.
The RCU has two contactors, one for each po wer source . They both cannot be on at the same
time. If there is a f ailure in either contactor or the control logic , the Type C alarm contact on the
rear panel is activated and the “Red Alert” LED turns on. Alarm conditions are: logic f ailure;
Contactor 1 or 2 fails to open; Contactor 1 or 2 f ails to close or open internal fuses. The front
panel LEDs shows the RCU’s status.
Inputs
Secondar
Primar
Contactor 1
Contactor 2
Figure 1.1
RCU Operating Diagram
Lo
Output
ic
1
1 Introduction
1.2 A Tour of the RCU
Purpose: Describes the RCU’s controls, displays and terminal blocks
(Figures 1.2, 1.3, 1.4, 1.5).
1.2.1 Front Panel (Figure 1.2)
1
Input 1 LED:
Shows the presence of AC power at Input 1.
2
Input 2 LED:
Shows the presence of AC power at Input 2.
3
Contactor 1 LED:
Shows Contactor 1 is closed, providing primary power to the output.
4
Contactor 2 LED:
Shows Contactor 2 is closed, providing secondary power to the output.
5
Output LED:
Shows there is power at the output.
6
Manual T ransfer LED:
Shows both primary and secondary power sources are in phase and that a manual transfer
can be done with the make–before–break manual bypass switch.
7
Red Alert LED:
Shows that one of the contactors or the control logic has failed.
8
Input 1 Circuit Breaker:
Provides circuit breaker protection to the primary input and acts as an ON/OFF switch.
9
Input 2 Circuit Breaker:
Provides circuit breaker protection to the secondary input and acts as an ON/OFF switch.
10
Select 1 Switch:
Opens the secondary contactor before closing the primary to provide Input 1 power to the
output.
11
Select 2 Switch:
Opens the primary contactor before closing the secondary to provide Input 2 power to the
output.
2
1 Introduction
1.2 A Tour of the RCU
1.2 A Tour of the RCU (Continued)
1.2.1 Front Panel (Continued)
12
Alarm Reset Switch:
Shuts off the audible Red Alert alarm.
13
Attachment Screws:
These two screws secure the front panel to the RCU .
Front Panel:
14
This hinged panel opens downward to access the interior for voltage configuration, fuse
changing or troubleshooting.
13
1 10 5
2
11
3
4
6
127
Figure 1.2
RCU Front Panel
14
13
9
8
3
1 Introduction
1.2 A Tour of the RCU
1.2.2 RCU Interior (Figure 1.3)
Front Panel:
1
This hinged panel opens downward to allow the operator access to the RCU interior to
configure the input/output voltage, replace fuses or f or troub leshooting. Two , 3.15 Amp
fuses are located here.
2
Contactors:
The primary and secondary contactors.
3
Sliding Panel:
This panel slides back and forth for access to the RCU’s input, output and alarm terminal
blocks.
4
Input 1 Terminal Block:
This terminal block is the primary power input.
5
Input 2 Terminal Block:
This terminal block is the secondary power input.
6
Output T erminal Bloc k:
This terminal block is the RCU’ s output.
Alarm Terminal Block:
7
This terminal block is the RCU’s alarm connection.
8
Power Board:
The RCU is configured here for 120, 208 or 240 VA C operation. Two, 500 mA fuses are
located on this board.
4
1.2 A Tour of the RCU
1 Introduction
1.2.2 RCU Interior (Continued)
2
3
1
8
4
5
Figure 1.3
RCU Interior (Cutaway View)
6
7
Wiring:
The wiring diagram for the terminal blocks is shown in Figure 1.4. Both Inputs share a common ground.
The alarm terminal block has Type C contacts to provide Contactor and Alarm status to the
monitoring system.
• Contactor K1 is normally closed.
• Contactor K2 is normally open.
• Red Alert Alarm is open when the system is operating normally.
5
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