Trane TR150 Programming Manual page 95

Parameters
in parameter group 5-3* Digital Outputs or parameter group
5-4* Relays.
NOTICE
The drive bypass cannot be deactivated if in fire mode. It
3 3
is deactivated only by either removing the fire mode
command signal or the supply to the frequency
converter.
When the drive bypass function is activated, the display on
the keypad shows the status message Drive Bypass. This
message has a higher priority than the fire mode status
messages. When the automatic drive bypass function is
enabled, it cuts in the external bypass according to
Illustration 3.18.
Illustration 3.18 Drive Bypass Function
24-10 Drive Bypass Function
Option:
[0] Disabled
*
[2] Enabled (Fire
Mode only)
24-11 Drive Bypass Delay Time
Range:
0 s [0 -
*
600 s]
94
Function:
This parameter determines which circum-
stances activate the bypass function:
If the timer expires before reset attempts
have completed, the bypass function
operates at trip at critical alarms, coast, or
bypass delay timer.
Function:
Programmable in 1 s increments. Once the bypass
function is activated in accordance with the setting
in parameter 24-10 Drive Bypass Function, the
bypass delay timer begins to operate. If the
frequency converter has been set for several restart
attempts, the timer continues to run while the
frequency converter tries to restart. If the motor
has restarted within the time period of the bypass
delay timer, the timer is reset.
TR150 and TR170
24-11 Drive Bypass Delay Time
Range:
02/2017 All rights reserved.
Function:
If the motor fails to restart at the end of the
bypass delay time, the frequency converter bypass
relay, which has been programmed for bypass in
parameter 5-40 Function Relay, is activated.
Where no restart attempts are programmed, the
timer runs for the delay period set in this
parameter and then activates the frequency
converter bypass relay, which has been
programmed for bypass in parameter 5-40 Function
Relay.
BAS-SVP16B-EN