5-63
Accessory Troubleshooting
TP-5672 11/95
Load-Shedding Contacts
The load-shedding contacts accessory, DD-35-N, allows
the user to control the number of loads as well as the
which loads will receive power. This accessory can
transfer from zero to nine isolated form C contacts before
and after the transfer switch transfers from either normal
source to emergency source or from emergency source
to normal source. The contacts can be either transferred
in a block or transferred sequentially in either direction.
The exact contacts to transfer are user programmable.
The time delays before transfer and the sequence
interval time delays are individually adjustable. Settings
may be made from the front panel keypad or from a
remote computer. The first relay to energize is K1 and
the last relay to energize is K10
See Figure 5-70 for the load-shedding contact option
wiring diagram and Figure 5-71 for the troubleshooting
flowchart.
294616
Harness
P11
P10
Ribbon Cable
294638
34
33
32
31
30
29
28
27
26
25
24
23
22
21
20
19
18
16
15
14
13
12
11
10
9
8
7
6
5
4
3
2
1
17
TB--DC1
MICROCONTROLLER
TB--AC1
ECS
EAS
NCS
NAS
LC
LB
LA
EC
EB
EA
NC
NB
NA
Shown De-energized
--294303
K1
K2
K3
K4
K5
K6
K7
K8
K9
K10
DCK
K10
K9
K8
K7
K6
K5
K4
K3
K2
K1
2
42A
42A
K1
K3
K5
K7
K9
K8
K6
K4
K2
2
560459
*--321201
*
Figure 5-70. Wiring Diagram— Option KD-35-N, Load-shedding contacts