IM620-1
37
Figure 21. Testing a Relay Circuit with a Disconnection
M10
115V
115 VAC
Output Board
DO 13
28
27
Neutral
MCB Replacement
If an MCB board is defective and must be replaced, the proper controller software must be loaded into
the replacement MCB. This can be done either at the factory or at the building site—if a PC equipped
with appropriate Monitor software is available.
The factory downloads the proper controller software into a replacement MCB board before it is
shipped if you include the appropriate MAG controller’s program code with the replacement MCB
part order. If the program codes is not provided, the MCB board is shipped without software.
Job-specific Monitor software includes each unit and auxiliary controller’s program. Therefore, it is
possible to download the proper controller software to a replacement MCB at the building site if a PC
equipped with that job’s Monitor software is available. In addition, if the controller’s configuration
data was stored on the PC hard drive prior to the MCB failure, the exact configuration can be restored.
Refer to the Monitor user’s manual for more information.
Parts List
Component
Designation
Description
Part No.
MCB
¬
Microprocessor Control Board
654873B-50
ICM Term. Brd.
Input Conditioning Module Terminal Board
733849C-01
OB
Output Board
492655B-04
T 1
Transformer: 115/24 Vac
606308B-01
T 2
Transformer: 24/18 Vac, Center Tapped
467381B-14
CB1
Circuit Breaker
473573B-08
—
Fuse: MCB Input Power, 2 Amp (Bussman No. GDC-2A)
658220A-
01
—
Fuse: MCB Communication Ports, 0.25 Amp
658219A-
01
—
PC Communications Cable Kit
005718680
2
—
RS-232 Cable Extension Kit
006548700
1
—
Ribbon Cable Assembly: MCB to Output Board
492652B-07
