889-3819-00
MMU2-1600GE series Operations Manual Rev Apr 2020 Page
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of 51
Sixteen FYA Types
The FYA left turn requires a 4 section head. The 4 indications are a Red Arrow, Solid Yellow
Arrow, Flashing Yellow Arrow (permissive) and a Green Arrow. This requires the MMU2 to
use 2 channels to monitor A FYA left turn for the proper signals. Some of the MMU2
Configuration Types are more efficient in use of the MMU2 channels. This is important
because the MMU2 has a limited number of channels.
Type A, B, C and D
require 1 channel for each protected left turns (1, 3, 5, 7) and 4 channels
for the 4 FYAs. The MMU2 uses 16 channels to monitor the 8 phases and 4 Peds. This leaves 0
MMU2 channels available. The Red and Yellow or the Green of the Protected Left Turn has to
be rewired.
13 2 5G
14
4
7G
15
6
8
3G
16
12G
11G
10G
1G
9G
RY
11RY
RY
9RY
10
12
9
2 5G
10
4
7G
11
6
8
3G
12
15G
14G
1G
13G
RY
15RY
RY
13RY
14
16
16G
13 2 11G
14
4
12G
15
6
8
10G
16
7G
5G
3G
9G
1G
RY
5RY
RY
1RY
3
7
9 2 15G
10
4
16G
11
6
8
14G
12
7G
5G
3G
13G
1G
RY
5RY
RY
1RY
3
7
