![background image](http://html1.mh-extra.com/html/gardner-denver/delcos-3100/delcos-3100_user-manual_3571327035.webp)
1. DELCOS 3100 Electronics
33
1.7.2.2
Speed regulation OFF
It is only expedient to set motor speed to maximum
speed for test purposes, i.e. to keep speed constant.
In this operating mode, the drive can be started once
the "converter ready" feedback signal is received. The
request for maximum speed is given to the converter
and the “max. speed” digital output additionally switches
to maximum speed. This maximum speed is pre-
programmed in the converter.
On-load/off-load control by the intake regulator takes
place in the standard mode, i.e. if network pressure >
max. network pressure, the machine is switched to off-
load mode, if network pressure < target pressure,
machine is switched to on-load mode.
If base-load sequencing (BLS) is activated, it must also
be noted that the machine will now be integrated into
the base-load sequencing system in the same way as a
standard compressor. After changeover, it can be at
base or peak-load position and also rotates within the
BLS system.
If the “setpoint > 3.5mA” feedback signal fails to arrive
in the [SPEED REGULATION ON] operating mode, the
[WARNING SPEED-SIG.] will be triggered, switching to
maximum speed with the “max. speed” digital output.
Providing all conditions are met, switching over to
[SPEED REGULATION ON] can take place while
operation is in progress.
1.7.2.3
Bypass operating mode (option)
By way of option, a star-delta bypass can be installed in
the converter cabinet. If the converter fails, it is possible
to switch over to the [BYPASS OPERATION] mode with
the machine shut down. The drive can then be restarted
via the star-delta bypass.
This is subject to the condition that the converter is not
feeding back any standby message and that the bypass
is not malfunctioning.
On-load/off-load control by the intake regulator takes
place in the standard mode, i.e. if network pressure >
max. network pressure, the machine is switched to off-
load mode, if network pressure < target pressure,
machine is switched to on-load mode.
If base-load sequencing (BLS) is activated, it must also
be noted that the machine will now be integrated into
the base-load sequencing system in the same way as a
standard compressor. After changeover, it can be at
base or peak-load position and rotates in the BLS
system.
It is not possible to switch over to the [SPEED
REGULATION ON] operating mode until the machine is
shut down and the [FEEDBACK CONVERTER] has
been received.
The "bypass ready" and "converter ready" messages
must not be present at the same time. This would result
In a fault (see Chapter 1.5.2 Faults/warnings table).
If [WARNING MS-BUS:A06] (BLS-Module) is present,
the "bypass ready" signal is not valid.
Switching over to bypass operation (option)
If the converter is malfunctioning, DELCOS 3100 shuts
down the machine with [FAULT CONVERTER].
Provided the bypass reports that it is ready, the system
switches over to bypass mode and the compressor is
restarted as follows:
•
Switch over from [SPEED REGULATION ON] to
[BYPASS OPERATION] in the [CONTROL MENU]
menu
•
Quit menu (press
key so that LED b goes out)
•
Acknowledge [FAULT CONVERTER] by pressing
the
acknowledgement key
•
Restart compressor in bypass mode
Note
Switching over with the power contactors in the
converter switch cabinet is delayed for a few seconds
with a time-delay relay. This means it is necessary to
wait for a short while after converter fault occurs.
Switching back from bypass mode (option) to
speed control
After the converter has been repaired, it is possible to
switch back to the [SPEED REGULATION ON]
operating mode as follows:
•
Switch compressor off and wait until motor comes to
a standstill
•
Switch convertor on
•
Switch over from [BYPASS OPERATION] to
[SPEED REGULATION ON] in the [CONTROL
MENU] menu
•
Quit menu (press
key so that LED b goes out)
•
Acknowledge fault: [FAULT BYPASS] by pressing
the
acknowledgement key
•
Restart the compressor in the [SPEED
REGULATION ON] operating mode.