KSB UPA, Installation & Operating Manual

Page: 53 / 98

5 Installation at Site
53 of 98
UPA / UPA S
3400.86/17-EN
Pt 100
A1 A2 A3 A4
4-wire system
For 4-core power cables only.
Testing 1. Core-to-core electrical resistance (measure with DC voltage V < 6 V)
If the temperature sensor is intact, the electrical resistance between the
individual cores shall be as follows:
– Resistance between A1 and A2 / between A3 and A4: 0 Ω to 30 Ω
– Resistance between A1 and A3 / between A2 and A4: 100 Ω to 130 Ω
2. Insulation resistance (measure with DC voltage V < 100 V). Combine all core ends.
– The resistance between the core ends and chassis ground (e.g. motor
housing) must be higher than 6 MΩ.
Function Two temperature limits are important for submersible motors.
1. Alert temperature t
Alert
If the alert temperature t
Alert
is exceeded, a malfunction has occurred (e.g.
inadmissible contamination / ochre build-up on the motor housing). Initiate
corrective action.
Setting:
t
Alert
= t
Operating
+ (t
Cut-out
- t
Operating
) / 2
t
Operating
= normal operating temperature after approximately 1.5 operating hours
2. Cut-out temperature t
Cut-out
If the cut-out temperature t
Cut-out
is reached, the motor must be tripped. It must
not be re-started until the malfunction has been remedied.
Setting:
Submersible motors with J1 winding (PVC): t
Cut-out
= 55 °C
Submersible motors with J2 winding (VPE): t
Cut-out
= 75 °C
NOTE
For the winding type, refer to the motor designation. ( ð Section 4.3, Page 19)
UMA-S 150, UMA 200, UMA-S 200, UMA 300 and 14D submersible motors are fitted
with a J2 winding.