ADVANCED APPLICATION OPTIONS
Multi-Motor Configurations
105
PID2 P-Gain [ADV2–39]:
Default = 30%
PID2 I-Gain [ADV2–40]:
Default = 1 second.
PID2 Low Limit [ADV2–41]:
Set the minimum frequency for PID2 output. Range =
[SET–22]
to
[ADV2–42].
PID2 High Limit [ADV2-42]:
[ADV2–41]
to
[SET–23]
.
PID2 Stp Delay [ADV2–43]:
Time to stop VFD when running on
PID2 Low Limit [ADV2-41]
.
PID2 Exit Level [ADV2–44]:
If feedback value is greater than
[ADV2–44]
for 10 seconds, then operation
switches from PID 2 to PID 1.
Multi-Motor Configurations
Several multi-motor configurations are available:
•
Equal Run Time
•
Soft Start Mode
•
Lead-Lag
•
Run Time Alt
•
Rotate Lead
Multi-Motor (MMC) Relay Control for Pump Applications
The multi-motor configuration for constant pressure systems provides control for up to 4 pump motors (8
with optional I/O board) in a Lead, Lag configuration.
The VFD controls speed of the Lead pump using its own PID feedback loop and the VFD motor output. If the
Lead pump cannot maintain setpoint pressure, the VFD uses relay outputs to trigger Lag pumps through a
starter, soft-starter, or another VFD. Relay output function (
[IO–47], [IO–48],
or
[IO–49]
, etc.
)
should be set to
47_MMC Out
. The lowest number relay set to MMC will be Lag 1.
This feature does not provide an alternation or Lead pump replacement in case of pump or VFD failure.
To enable Lead, Lag Relay Control, set the following parameters:
MMC Mode [ADV–10]:
Set to
3_Lead-Lag
.
Lag Start Freq [ADV–18]:
When the lead pump runs above this frequency, it sets the first condition for
starting a Lag pump. Range =
Lag Stop Freq [ADV–23]
to
PID Hi Hz Limit [SET–23]
. Default = 59.5 Hz.
Lag Start Delay [ADV–19]:
Sets a delay time to start Lag pump when both frequency and pressure condi
-
tions are met. Default = 10 sec.
Lag Start Level [ADV–20]:
Sets a percentage of
PID F/B Max [SET–20]
to calculate “MMC Below Setpoint” as
the second condition for starting a Lag pump. Range = 0.1 to 10%. Default = 2%.
NOTE:
“MMC Below Setpoint” =
[SET–21] – {[SET–20] x [ADV–20]/100}
.
Lead Freq Drop [ADV–21]:
Output frequency drop value with
[ADV–22]
at Lag pump start to prevent system
overpressure condition. Default = 10 Hz.
MMC Decel Time [ADV–22]:
Sets the deceleration time for the
[ADV–21]
frequency drop. Default = 2 sec.
Lag Stop Freq [ADV–23]:
When the Lead runs below this frequency, it sets the first condition for stopping
Lag pumps. Default = 35 Hz.
Lag Stop Delay [ADV–24]:
Sets a delay time to stop Lag pump when both frequency and pressure condi
-
tions are met. Default = 4 sec.
Lag Stop Level [ADV–25]:
Sets a percentage of
PID F/B Max [SET–20]
(frequency) to calculate “MMC Below
Setpoint” as the second condition for stopping a Lag pump. Default = 0.3%.
NOTE:
“MMC Below Setpoint” =
[SET–21] + {[SET–20] x [ADV–25]/100}
.
Lead Freq Bump [ADV–26]:
Output frequency increase value with
[ADV–27]
at Lag pump stop to prevent
system underpressure condition. Range = 0 to
[SET–23]
*0.4. Default = 0 Hz.
MMC Accel Time [ADV–27]:
Sets the acceleration time for the
[ADV–26]
frequency bump. Default = 2 sec.
Lag Pump Start sequence:
If the Lead motor runs at a speed equal or greater than
[ADV–18]
with system
pressure less than “MMC Below Setpoint” for
[ADV–19]
delay, the VFD will decrease output frequency by
Summary of Contents for CERUS X-DRIVE CXD-003A-4V
Page 2: ......
Page 3: ...CERUS X DRIVE INSTALLATION AND OPERATION MANUAL Firmware Version 1 2 Franklin Electric Co Inc ...
Page 96: ...OPERATION Protection Features 96 ...
Page 112: ...ADVANCED APPLICATION OPTIONS Multi Drive Configurations 112 ...
Page 124: ...COMMUNICATIONS BACnet Communication 124 ...
Page 128: ...ACCESSORIES Optional Extension Cards 128 Frame D Frame E Frame F ...
Page 129: ...ACCESSORIES Optional Extension Cards 129 Frame G Frame H ...
Page 132: ...ACCESSORIES Optional Extension Cards 132 ...
Page 234: ...PARAMETER REFERENCE TABLES Parameter Descriptions Motor Menu 234 ...
Page 250: ...GLOSSARY 250 ...
