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3) Please note the series of jumpers in the above diagram. These must be connected in addition to the
daisy chain input/output wiring. Two of the jumpers are already factory installed (see below). The rest
must be connected at the time of fan installation. The numbers in the diagram correspond to numbers
on the drive’s terminal block (see Image 18 on page 18 of these instructions).
Factory installed jumpers – 10 & 11 / 9 &15
Field installed jumpers – 9 & 18 / 9 & 20 / 10 & 22 / 12 & 17 / 12 & 21
4) Make sure that the DIP switch labeled “1” is in the ON (or up) position. This switch is located to the left
of I/O terminal block pin #9. Refer to Image 18 on page 22 for more information.
5) To reduce noise and potential drive interruption, it is recommended that daisy chain wire be run
through conduit.
6) SPEED SCALING:
Because of line losses, downstream followers may initially rotate at a slower speed than that of the
master. To rectify this problem, perform these steps:
Make sure the “master” fan is in LOCAL mode and all “followers” are in REMOTE mode. If it is safe to
do so, turn the master fan on to maximum speed. All fans should begin spinning at this time. Note the
maximum speed on the master unit’s keypad (in RPMs).
a. Go to the first downstream follower. If the unit is rotating at the same speed as the master, no
additional action is necessary. However, if the speed is slower than the master, go to Step (b).
b. Unlock the follower’s parameter set:
i. Set the fan in local mode by pressing the LOC/REM button.
ii. Press the MENU key on the keypad.
iii. Highlight the PARAMETERS option. Press ENTER.
iv. Use the up/down arrow keys to highlight parameter group 16. Press SELECT.
v. Scroll down to parameter 1603 PASS CODE. Enter the pass code shown next to the
parameter’s description on page 211 of the “ACS355 User’s Manual.” You will use the
up/down arrow keys to enter the code. Once entered, press the SAVE key.
vi. Scroll up and select parameter 1602 PARAMETER LOCK. Using the arrow keys,
change the status from LOCKED to OPEN. Press the SAVE key.
vii. Continue pressing the EXIT key until you arrive at the keypad’s output screen. Return
the fan to REMOTE mode by pressing the LOC/REM button.
c. Once the parameter set has been unlocked, the fan speed will need to be scaled to match
that of the master. To accomplish this:
i. Press the MENU key on the keypad.
ii. Highlight the PARAMETERS option. Press ENTER.
iii. Use the up/down arrow keys to highlight parameter group 01. Press SELECT.
iv. Scroll down to parameter 0120 AI 1. This is a read-only parameter. Jot down or
remember its value, expressed as a percentage (%). Press EXIT until you reach the
keypad output screen.
v. Place the fan in LOCAL control by pressing the LOC/REM button.
vi. Navigate back to parameter group 13. Press SELECT.
vii. Find parameter 1302 MAXIMUM AI1. Using the arrow keys, enter the percentage
from parameter 0120. Press the SAVE key.
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