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Running the Pump
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311596A
Operational Envelope Limit
Explosion-proof electric motors have constant torque
and variable torque limits. E-Flo Plus system is a con-
stant torque application, and therefore the motor’s con-
stant torque limits must not be violated. The system is
available with two motors: the UL explosion-proof motor
and the ATEX explosion-proof motor. To stay within the
allowed torque, flow and pressure limits are installed.
Flow Limit
Speed command is limited to 5:1 operation, where mini-
mum allowed frequency is 10Hz and maximum allowed
frequency is 50Hz. Jog and Prime modes are excep-
tions because of the time limits imposed on these
modes and because these modes are not continuous
modes of operation.
2000cc lowers:
Minimum Flow = 4.5 gpm (17.1 lpm)
Maximum Flow = 22.6 gpm (85.9 lpm)
1500cc lower:
Minimum Flow = 3.2 gpm (12.2 lpm)
Maximum Flow = 16.2 gpm (61.5 lpm)
1000cc lowers:
Minimum Flow = 2.4 gpm (9.1 lpm)
Maximum Flow = 11.9 gpm (45.2 lpm)
Pressure Limit
Operating pressure limits are unique to the pump lower
sizes. If the system pressure is greater than the maxi-
mum allowed for a given pump lower size for longer than
30 seconds, system Trip #44 will shut the system down.
System pressure limits are as follows:
2000cc lower: 250 psi
1500cc lower: 330 psi
1000cc lower: 460 psi
Running the Pump
Secure Disable
According to Control Techniques Unidrive SP User
Guide, “Secure Disable (SD) function provides a means
for preventing the drive from generating torque in the
motor, with very high level of integrity”. This hardware
function controls enable/disable state of the drive.
Secure Disable/Drive enable hardware input (pin #31) is
designed for positive logic input only. It should be con-
nected to internal 24VDC power supply (pin #22). The
SD is a fail-safe function; it enables the drive when
24VDC is connected to SD hardware input and disables
(inhibits) the drive when SD hardware input is open.
Pr 6.29 and Pr 8.09 can be used to monitor state of the
Hardware enable input.
Local I/O Box (Graco P/N: 120373) provides a normally
closed Secure Disable switch, which has a red mush-
room button (press to latch, pull to unlock). When
latched, switch opens SD circuit, therefore disabling
(inhibiting) the drive. When unlocked, switch closes SD
circuit, enabling the drive.
CAUTION
The drive has been programmed by Graco. Do not
attempt to recalibrate the Sequencer or Motor Control
as it can interfere with the Graco Program.