Optidrive HVAC User Guide V2.00
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Parameter Name
Minimum Maximum
Default
Units
P8-10 Fire Mode Speed
-P1-01
P1-01
0.0
Hz / Rpm
When set to a non-zero value, this parameter sets an operational fixed frequency / speed used when Fire Mode is selected. The
drive will maintain operation at this frequency until the fire mode signal is removed or the drive is no longer able to sustain
operation.
When P8-10 is zero, and fire mode is activated, the drive will continue to operate under the control of the selected speed
reference, dependent on parameter settings and digital input selection.
P8-11 Bypass Mode on Fault
0
1
0
-
Parameter configures the drive to switch to bypass mode automatically should a trip occur on the drive. When enabled the drive
standard relays 1 and 2 are dedicated to bypass control and cannot be assigned other functions.
0 = Disabled
1 = Enabled
P8-12 Bypass mode of Fire
0
1
0
-
Parameter configures the drive to switch to bypass mode automatically should an input to the drive be configured for Fire Mode
operation and that input becomes active. When enabled the drive standard relays 1 and 2 are dedicated to bypass control and
cannot be assigned other functions.
0 = Disabled
1 = Enabled
For further information on using the Bypass function, refer to the Optidrive HVAC Bypass function Application Note.
P8-13 Bypass Contactor Changeover Time
0
30
2
Secs
Parameter active when Bypass function is enabled. Parameter P8-05 sets a time delay or changeover time between the switching
of the drive relays controlling the bypass circuitry.
Care must be taken when setting P8-13 to ensure that drive and DOL contactors are not switched in circuit simultaneously.
Both Mechanical and Electrical interlocking of drive and DOL contactors to regional standards are recommended in configuring
the Bypass function.
P8-14 Pump Staging Function Select
0
2
0
-
Parameter enables the pump staging (cascade) function on the drive
0 = Disabled
1 = Single VFD with DOL Cascade (max 4 DOL pumps)
2 = Multiple Drive Cascade Master Drive (Only valid when drive set to Optibus master address, P5-01 = *
For further information on using the Cascade function, refer to the Optidrive HVAC Cascade Operation application note.
P8-15 Number of Assist Pumps
1
4
1
-
Parameter valid when P8-14 is set to 1 or 2 to enable Pump Staging Function. P8-15 set the number of assist pumps (P8-14 = * or
network slave drives (P8-14 = 2) that are available in the Pump Staging application. Setting the value to 0 disables Pump Staging.
P8-16 Pump Duty Switch Over Time
0
1000
0
Hours
In order to balance run time (duty) on each pump in the Pump staging application and to ensure periodic operation of each pump
P8-16 can be set with a time limit for pump switch over. When set to a value other than 0 (disabled) the operation of each
staging pump will be cycled to ensure the difference in duty between each pump does not exceed the time set in P8-16
P8-17 Assist Pump Start Speed
P8-18
P1-01
0
Hz / RPM
HVAC Optidrive upper speed Staging threshold. When the drive output increases beyond this threshold the next Staging pump is
switch on. The Pump staging settle time must then expire before additional staging pumps can be brought on or off line. Priority
for Staging pump switch on is always given to the pump with lowest run time accumulated.
P8-18 Assist Pump Stop Speed
0
P8-17
0
Hz / RPM
HVAC Optidrive lower speed Staging threshold. When the drive output decreases below this threshold one of the Staging pumps
currently operating is switch off. The Pump staging settle time must then expire before additional staging pumps can be brought
on or off line. Priority for Staging pump switch off is always given to the pump with highest run time accumulated.
P8-19 Pump Settling Time
10
600
10
Secs
Parameter sets a time delay for pump staging whereby, following switch in or switch out of a staging pump, further pumps are
not permitted to be switched in or out until this time period has elapsed. This parameter should be set to allow adequate settle
time between staging pump transitions.
P8-20 Pump Master Clock Reset
0
1
0
-
Master drive in pump staging monitors and maintains duty run times for all available staging pumps. All clocks are available to
view in P0-20. P8-20 provides the master reset to all run time clocks used for Pump Staging Function (all clocks set to 0).
