Dynalco SST-2400H Speed Switch/Transmitter - Manual (Page 22)

Calibrating the SST-2000A/H
You must calibrate the SST-2000A/H if you have made a change in the full-scale
frequency range (changed contacts to DIP switch A).
1 Disconnect any meter connected to terminals 7 & 8. Mark or
position the wires so they can be correctly reattached later.
2 Connect a digital voltmeter across terminals 7(–) & 8 (+).
3 Connect a frequency generator (e.g. F-16) at terminals 5 (HI) & 6
(COM). Use the frequency generator to input the new full-scale
frequency.
4 Adjust the FREQ RANGE TRIM potentiometer for 10.00 Vdc on
the voltmeter. (See Fig. 4-9.)
5 Reattach the meter that is normally connected to terminals 7(–) &
8 (+). Observe polarity.
22
Chapter 4
Calibrate the speed switch:
• immediately after any contact change in Switch A
• before adjusting set points or proportional output
WARNING
S.P.
2
S.P.
1
FR EQ.
R AN GE TR IM
METER CAL
FREQU EN CY
RANGE SWITCH
SIGNAL
SEN SI TIVITY
AFTER SETTI NG R ANGE
SW ITCH “A”, TR IM FOR 10. 0V
AT OPEN TER MINA LS 8 & 7 AT
FULL SC ALE FR EQUEN CY.
MAX
1,8: .08 - .1
4,8: .17 - .22
7,8: .38 - .5
1,4,7,8: .63 - .83
1, 2, 3, 5, 6, 8: .83 - 1.09
1: .86 - 1.12
4: 1.9 - 2.5
7: 4.2 - 5.5
1, 2, 3, 5, 6: 9.1 - 12
2, 3, 4, 6, 7: 12 - 15.5
1, 2, 3, 4, 5, 6, 7: 15.1 - 20
; 2: 1.1 - 1.4
; 5: 2.5 - 3.2
; 7,2: 5.3 - 6.9 ; 3: 1.4 - 1.9
; 6: 3.2 - 4.2
; 1, 4, 7: 6.9 - 9.1
; 2,8: .1 - .13
; 5,8: .22 - .3
; 7,2,8: .48 - .63 ; 3,8: .13 - .17
; 6,8: .3 - .38
8
7
6
5
4
3
2
1
O
F
F
A
Fig. 4-9 The contact
arrangements for the
full-scale frequency
range switch (A) are on
underside of the top
plate.