Chapter 4 – Start-up Procedure
4-4
ACH 400 with Electronic Bypass User’s Manual
Macros and
Parameter Settings
Apply power to the Electronic Bypass unit. The display should show the
operating status of the drive. If the motor is a standard 208 V, 60 Hz motor
connected to a 208 V drive or a 480 V, 60 Hz motor connected to a 480 V
drive, the default parameter settings should be suitable for the initial tests
described below. If the motor’s rating is not 208 V or 480 V, 60 Hz, the
MOTOR NOM VOLT and MOTOR NOM FREQ parameters will need to be
properly set before proceeding. Refer to the ACH 400 User’s Manual and set
the parameters as required.
The default macro is HVAC. If the HVAC FLOATING POINT macro or the
HVAC PID macro will be used, the selected macro can be set after
completing the initial tests.
Keypad Control Tests
Motor Disconnected
from the ACH 400
with Electronic Bypass
After setting the Start-up Data parameters, test and become familiar with the
operation of the ACH 400 Drive with Electronic Bypass without the motor
connected as follows:
1. Disconnect and lock out power to the Electronic Bypass unit, wait at
least five minutes after disconnecting power.
2. Disconnect the motor from the Electronic Bypass unit.
3. Apply power to the Electronic Bypass unit by turning on the branch
circuit disconnect device and the bypass disconnect switch or circuit
breaker.
4. The ACH 400 Control Panel display should be illuminated. On the
bypass keypad, the Ready LED and Enable LED should be illuminated.
If the Enable LED is not illuminated, check to see that closed contacts or
a jumper connect terminal X2:2, on the bypass control board, to terminal
X2:10 or 13.
5. Either the Drive Selected or Bypass Selected LED should be illuminated.
Pressing the Drive Select or Bypass Select key should switch the bypass
back and forth between the Drive mode and the Bypass mode as
indicated by the LEDs above each button. Check that the key switches
the bypass between modes and leave the system in the Bypass mode
when proceeding to the next step.
6. Check to see that pressing the Auto key on the bypass keypad causes the
Auto LED to be illuminated, pressing the Hand key causes the Hand
LED to be illuminated and pressing the OFF key causes either the Hand
or Auto LED to go off. Leave the Hand and Auto LEDs off when
proceeding to the next step.
7. For Steps 8 through 13, set Parameter 9904 MOTOR CONTROL MODE
to “SCALAR” for drive units above 50 Hp. Refer to the ACH 400 User’s
Manual for details on setting parameters. After successful completion of
Step 12, return Parameter 9904 to “DTC”.
8. Press the Drive Select key on the bypass keypad. The Drive Select LED
should be illuminated.
Summary of Contents for ACH400 Series
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