Specifications

11
ViSSion® 20/20 Retrofi t Instructions • 35391SCRF
Step 4. A dry contact from control relay CR12 must be wired to oil pump motor starter coil. This dry contact is
wired to two terminal blocks according to supplied drawing. Control power for this coil should come
from a source, which will be de-energized with compressor disconnect.
Step 5. An auxiliary safety cutout is available to shut down compressor package. A dry contact must be supplied
and wired to terminal blocks 1 and 32. The jumper installed on terminal blocks must be removed to use
this cutout. If contact is closed, it will allow compressor to run. If contact opens at any time, compressor
will shut down.
GND
GND
GND
1
HT-N2
CB
A15
2C CB
A15
1
CB
A15
2C
HT-N1
CB
A15
2C
DIGITAL WIRING
CUSTOMER DIGITAL WIRING
CUSTOMER ANALOG WIRING
C5
5
OPEN
C4
4
3
2
1
GND
GND
GND
1
1
1
1
1
1B
N
N
N
N
N
11
12
13
14
15
16
17
18
28
27
26
25
24
23
22
21
31
32
33
34
35
36
37
38
X1
X2
X3
X4
X5
X1
X2
X3
X4
X5
ANALOG INPUT BOARD #7 ANALOG INPUT BOARD #6
DIGITAL INPUT BOARD #3 DIGITAL OUTPUT BOARD #2 DIGITAL OUTPUT BOARD #1
HT-N2
CB
A
15
2C
CB
A15
1
CB
A
15
2C
HT-N1
CB
A
15
2C
ANALOG OUTPUT BOARD #10
45
46
47
48
1
1
1
1B
N
N
N
N
N
Figure 11. Vission 20/20 Terminal Blocks
Step 6. Indication of compressor shutdown status is also available. There is an output on terminal blocks 18 and
N where a relay coil can be wired. For output, an energized state represents a “safe” condition. A de-
energized state indicates a loss of voltage to relay coil or a “failure” has occurred.
Step 7. Current transformer supplied in compressor motor conduit box should be checked to insure that motor
leads of one leg are pulled through the transformer. Note, there is a dot on one side of the current
transformer. This dot must face away from the motor. Typically, a wye delta started motor should
have leads 1 and 6 pulled through this transformer for a 6 lead motor. However, this should always be
checked as different motors and starting methods will require different leads to be used.