S7- Power battery related introduction - 400 PLC

1. Monitoring the battery switch choice and action

the following applies to bring a backup battery power supply module:

BATT

battery switch position is monitored. If the backplane bus low voltage is detected, the BAF light is lit. OB81 is invoked in the CPU. OFF switch position

backup battery is not being monitored. If you are using the battery is in good working condition, in the case of power failure occurred under this setting, it is also used as a backup. The following applies to take two pieces of spare battery power supply module:

two BATT switch position batteries are being monitored. If the backplane bus low voltage is detected, the BAF light is lit. OB81 is invoked in the CPU. 1 BATT switch position only on the left side of the battery (

Called BATT. 1) Be monitored. If the backplane bus low voltage is detected, the BAF light is lit. OB81 is invoked in the CPU. But, if you insert a second piece of battery, in the first piece of battery failure cases, it is also used as a backup.

OFF switch position backup battery is not being monitored. If you are using the battery is in good working condition, in the case of power failure occurred under this setting, it is also used as a backup. 2. Battery alarm and reset

after selecting monitoring switch, the alarm when the battery failure occurs and the BAF light is lit, and the external CPU fault lights, suggests that need to check the battery or replacement. After replace the battery, the BAF light is bright, need to press the FMR ( Failure reset) After the alarm to disappear.

3。 The battery activation

S7 - after dormancy 400 CPU use lithium batteries ( Lithium/thionyl chloride) 。 Lithium battery in the case of long-term placed generates the passivation film, in the protection and the dormant state, this feature will directly affect the function of spare battery. In this case, when the system is power on, the CPU will prompt error message. Backup battery in the case of a power supply module power will be to passivation, the lithium battery into S7 - 400 of the power supply unit to remove the passive film of lithium-ion batteries. This process takes a few minutes. When the passivation film is cleared and lithium battery reaches its rated voltage, can use FMR button to confirm the power supply module error information.

because of the storage time of lithium batteries are usually not speculate, recommend the following steps to remove passivation membrane:

low insert spare batteries in the battery compartment ( Group) 。 When using FMR button to make sure all battery power supply unit of fault information.

if you cannot confirm the battery failure, etc. Try again in a few minutes. If still unable to confirm the battery failure, pull out the battery, Group) Across the short circuit, and short circuit 1 seconds to 3 seconds, the big electric current activated, low attention to short circuit time not more than 3 seconds.

low reinsert batteries ( Group) Using FMR button to try again to confirm. Low disappear when the fault information is shown in the battery, the battery ( Group) Ready to use.

if the fault information is shown in the battery does not disappear, the battery ( Group) No electricity.