[ VII Control ]
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HWE1018A GB
(6) When an Error Occurs
If an error is detected by a unit or a communication failure between the systems in the group while the rotation function is
enabled, the units will perform the actions as described in Table 1, and the rotation control will be temporarily stopped.
When the starting conditions are met, this function will be resumed, and the rotation sequence and the system rotation timer
count effective at the time of error will be kept.
Table.1 Operation of Units during an Error
(7) Rotation Function Test Run Mode
Proper operation of the rotation function can be checked in a short time using the rotation function test run mode.
Rotation function test run mode can be initiated by starting the control unit in the test run mode (via MA remote controller).
In this mode, the system rotation timer setting is reduced to approximately three minutes (from the usual 480 hours), and the
test run will automatically end when the control unit is rotated to the backup unit.
At the completion of the test run mode, the system rotation timer setting goes back to 480 hours, and this function will remain
effective.
Important Notes on Rotation Control
All the units in the system using the rotation function must be the same capacity and installed within the same area to be
cooled.
Check that the items to be cooled are not affected no matter which unit stops when designated as a backup unit.
The backup unit automatically goes into operation only when there is a problem with other units in the group. It will not auto-
matically go into operation even if the heat load increases.
The control unit cannot perform a test run while the system rotation function is performed. Disable the system rotation control
function to perform a test run.
If multiple units are grouped with an MA remote controller or a G-50A controller, this control function will not work properly.
Rotation status A unit in the group made an abnor-
mal stop.
Communication failure between
systems
Control unit Backup unit Goes into operation Goes into operation
Regular unit Sends a startup signal to the back-
up unit
Sends a startup signal to the back-
up unit
Other units Backup unit Goes into operation by receiving a
signal from the control unit
1) Goes into operation by re-
ceiving a signal from the con-
trol unit
2) Goes into operation
*1
*1. The backup unit will automatically resume its operation when periodical communication from the control unit is lost.
Regular unit Sends its own error status to the
control unit
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