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Menu 6
Digitax ST Advanced User Guide 93
Issue Number: 1 www.controltechniques.com
Pr 6.24 and Pr 6.25 form the energy meter that indicates the net energy supplied to/from the drive in kWh. (i.e. energy supplied by the drive - energy
fed back to the drive). For motor control modes a positive value indicates the net transfer of energy from the drive to the motor. If the maximum or
minimum of Pr 6.24 is reached, the parameter does not roll over but is instead clamped to the maximum or minimum value.
Instantaneous read out of the cost/hour of running the drive. This requires Pr 6.16 to be set up correctly.
See Pr 6.18 on page 91.
The trip log includes time stamping for individual trips provided Pr 6.49 is set to one. If Pr 6.28 is zero, the powered-up clock is used for time
stamping. If Pr 6.28 is one, the run time clock is used for time stamping. It should be noted that changing this parameter clears the trip and trip time
logs.
This bit shows whether the drive is in the enable state or not.
Generally this will reflect the state of the enable input and shows the same value as Pr 8.09. However the disabled state can be forced by other
functions within the drive. Pr 8.09 will always follow the enable input state but the Pr 6.29 will be held at zero, indicating that the drive is forced into the
disable state by the following:
1. A digital input is routed to this parameter as described below to provide a fast disable and the input forces this parameter to zero.
2. Any of the following trips are active: OI.AC, PS.10V, PS.24V, OI.Br, OV.
If the destination of one of the drive digital I/O (Pr 8.21 to Pr 8.26) is set to Pr 6.29 and the I/O is set as an input, it provides a fast disable function. The
SAFE TORQUE OFF (SECURE DISABLE) input to the drive (T31) disables the drive in hardware by removing the gate drive signals from the inverter
IGBT's and also disables the drive via the software system. When the drive is disabled by de-activating the SAFE TORQUE OFF (SECURE
DISABLE) input there can be a delay of up to 20ms. However, if a digital I/O is set up to provide the fast disable function it is possible to disable the
drive within 600us of de-activating the input. To do this the enable signal should be connected to both the SAFE TORQUE OFF (SECURE DISABLE)
(T31) and to the digital I/O selected for the fast disable function. The state of the digital I/O including the effect of its associated invert parameter is
ANDed with the SAFE TORQUE OFF (SECURE DISABLE) to enable the drive.
If the safety function of the SAFE TORQUE OFF (SECURE DISABLE) input is required then there must not be a direct connection between the SAFE
TORQUE OFF (SECURE DISABLE) input (T31) and any other digital I/O on the drive. If the safety function of the SAFE TORQUE OFF (SECURE
DISABLE) input and the fast disable function is required then the drive should be given two separate independent enable signals. A safety related
enable from a safe source connected to the SAFE TORQUE OFF (SECURE DISABLE) input on the drive.
6.25 Energy meter: kWh
Coding
BitSP FI DETEVMDPNDRANCNVPTUSRWBUPS
21 1 1 1
Range ±99.99 kWh
Update rate Background write
6.26 Running cost
Coding
Bit SP FI DE TE VM DP ND RA NC NV PT US RW BU PS
1111
Range ±32,000
Update rate Background write
6.27 Time before filter change due
Coding
Bit SP FI DE TE VM DP ND RA NC NV PT US RW BU PS
111 11
Range 0 to 30,000 hrs
Update rate Background read
6.28 Select clock for trip log time stamping
Coding
BitSP FI DETEVMDPNDRANCNVPTUSRWBUPS
111
Default 0
Update rate Background read
6.29 Hardware enable
Coding
Bit SP FI DE TE VM DP ND RA NC NV PT US RW BU PS
111
Update rate 4ms write
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