Franklin Electric CERUS X-DRIVE CXD-003A-4V, Installation And Operation Manual, Page: 106 / 252

ADVANCED APPLICATION OPTIONS
Multi-Motor Configurations
106
[ADV–21]
value for
[ADV–22]
time and then activate relay output to start the first Lag Pump in sequence. After
a non-adjustable 1 sec delay, the VFD will change [SET–23] to its original value and check for Lag Start/Stop
conditions. If demand is still high, the VFD will repeat Lag Start sequence for additional Lag pumps.
Lag Pump Stop sequence: If the Lead motor runs at a speed equal or less than [ADV–23] with system pres -
sure equal or greater than “MMC Below Setpoint” for
[ADV–24]
delay, the VFD will increase output frequency
by [ADV–26] value for [ADV–27] time and then it will deactivate relay output to stop the first Lag Pump. After a
non-adjustable 1 sec delay, the VFD will change
[SET–22]
to its original value and check for Lag Start/Stop
conditions. If demand is still low, the VFD will repeat Lag Stop sequence for additional Lag pumps. If all Lag
pumps are stopped, the VFD will check for Sleep Mode conditions.
If the VFD run command is removed during MMC operation, all Lag pump relays will deactivate in sequence
with a 1 sec delay between each relay. The delay will protect from voltage surges in the power line when Lag
pumps stop. The VFD will then stop the Lead based on the selected method (Decel or Coast).
If the VFD trips on a fault during MMC operation, the VFD will immediately deactivate all Lag pump relays
and it will coast stop.