are active they replace the functions of the equivalent parameters. For example, if Pr 6.43 = 1 and bit 7 of Pr 6.42 = 1 the drive enable is no longer

controlled by Pr 6.15, but by bit 0 of the control word. If either Pr 6.43 = 0, or bit 7 of Pr 6.42 = 0, the drive enable is controlled by Pr 6.15.

Bit 8: Analog/preset reference

When the control word is enabled (Pr 6.43) bit 8 of the control word becomes active. (Bit 7 of the control word has no effect on this function.) The state

of bit 8 is written to Pr 1.42. With default drive settings this selects analog reference 1 (bit8 = 0) or preset reference 1 (bit8 = 1). If any other drive

parameters are routed to Pr 1.42 the value of Pr 1.42 is undefined.

Bit12: Trip drive

When the control word is enabled (Pr 6.43) bit 12 of the control word becomes active. (Bit 7 of the control word has no effect on this function.) When

bit 12 is set to one a CL.bit trip is initiated. The trip cannot be cleared until the bit is set to zero

Bit 13: Reset drive

When the control word is enabled (Pr 6.43) bit 13 of the control word becomes active. (Bit 7 of the control word has no effect on this function.) When

bit 13 is changed from 0 to 1 the drive is reset. This bit does not modify the equivalent parameter (Pr 10.33).

Bit 14: Keypad watchdog

When the control word is enabled (Pr 6.43) bit 14 of the control word becomes active. (Bit 7 of the control word has no effect on this function.) A

watchdog is provided for an external keypad or other device where a break in the communication link must be detected. The watchdog system can be

enabled and/or serviced if bit 14 of the control word is changed from zero to one with the control word enabled. Once the watchdog is enabled it must

be serviced at least once every second or an "SCL" trip occurs. The watchdog is disabled when an "SCL" trip occurs, and so it must be re-enabled

when the trip is reset.

6.45

Force cooling fan to run at full speed

Bit

Coding

Update rate

Background read

The drive thermal model system normally controls the fan speed, however the fan can be forced to operate at full speed if this parameter is set to 1.

When this is set to 1 the fan remains at full speed until 10s after this parameter is set to zero.

Note when the drive is in the UU state, the fan always runs at minimum speed.

6.50

Drive comms state

Bit

Coding

Default

0 to 3

Update rate

Background write

The drive comms system 128 bytes buffer used with ANSI or Modbus rtu protocols via the 485 connector can be controlled by an option module

under certain circumstances. This parameter shows which node has control of the buffer (0 (drv) = drive, 1 (Slot1) = option module in slot 1, etc. If an

option module has control of the buffer the drive will use an alternative buffer for 485 comms and the following restrictions will apply:

1. Comms messages via the 485 port are limited to a maximum of 32 bytes

2. The 6 pin keypad port will operate correctly with an LED keypad, but it will no longer operate with an LCD keypad

3. Modbus messages using the CMP protocol can only route messages to nodes within the drive. It will not be possible for these to be routed further,

i.e. via CT Net on an SM Applications module.

6.52

Zero reference interlock

Bit

Coding

Default

Update rate

Background read